Brightness on HP EliteBook 8460p

Brightness on HP EliteBook 8460p

[Pali Rohár]

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Hello,

on my HP EliteBook 8460p is not possible to set display brightness when ACPI 
is enabled in kernel. Entries in sysfs is properly created without errors. But 
when I try write any value to /sys/class/backlight/acpi_video0/brightness 
nothing happened (and no error is in dmesg). When I press Fn key for chaining 
display brightness kernel send correct key event (tested with xev) but nothing 
happened too.

When I disabled ACPI (acpi=off in kernel command line) all Fn keys are broken 
and not working (no events in xev). But brightness keys working (I think on HW 
level, because xev does not see it) - increase and decrease display 
brightness.

So what can I do with my notebook? I think that there is error/bug in BIOS or 
ACPI because with disabled ACPI brightness working. But with disabled ACPI is 
notebook unuseable (no battery info, no Fn keys, no WIFI rfkill, ...). Can 
somebody help me with this problem?

-- 
Pali Rohár
pali.rohar@gmail.com

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[-- Type: application/pgp-signature, Size: 198 bytes --]

Re: Fwd: Brightness on HP EliteBook 8460p

[joeyli]

Hi Pali,

於 五，2011-12-09 於 22:36 +0800，Li Joey 提到：
> 
> 
> ---------- Forwarded message ----------
> From: Pali Rohár <pali.rohar@gmail.com>
> Date: 2011/7/15
> Subject: Brightness on HP EliteBook 8460p
> To: linux-acpi@vger.kernel.org
> 
> 
> Hello,
> 
> on my HP EliteBook 8460p is not possible to set display brightness
> when ACPI
> is enabled in kernel. Entries in sysfs is properly created without
> errors. But
> when I try write any value
> to /sys/class/backlight/acpi_video0/brightness
> nothing happened (and no error is in dmesg). When I press Fn key for
> chaining
> display brightness kernel send correct key event (tested with xev) but
> nothing
> happened too.
> 
> When I disabled ACPI (acpi=off in kernel command line) all Fn keys are
> broken
> and not working (no events in xev). But brightness keys working (I
> think on HW
> level, because xev does not see it) - increase and decrease display
> brightness.
> 
> So what can I do with my notebook? I think that there is error/bug in
> BIOS or
> ACPI because with disabled ACPI brightness working. But with disabled
> ACPI is
> notebook unuseable (no battery info, no Fn keys, no WIFI rfkill, ...).
> Can
> somebody help me with this problem?
> 
> --
> Pali Rohár
> pali.rohar@gmail.com
> 

You can try to put kernel parameter:

	acpi_osi="!Windows 2009"

to /boot/grub/menu.lst, then reboot look at maybe better.

And, 
could you please kindly share DSDT and dmidecode to me?
Plesae login by root then:
	% acpidump > acpidump.dat
	% dmidecode > dmidecode.log


Thanks a lot!
Joey Lee 

Re: Fwd: Brightness on HP EliteBook 8460p

[Pali Rohár]

[-- Attachment #1: Type: text/plain, Size: 2362 bytes --]

On Friday 09 December 2011 16:46:29 Pali Rohár wrote:
> On Friday 09 December 2011 22:49:09 joeyli wrote:
> > Hi Pali,
> > 
> > 於 五，2011-12-09 於 22:36 +0800，Li Joey 提到：
> > 
> > > ---------- Forwarded message ----------
> > > From: Pali Rohár <pali.rohar@gmail.com>
> > > Date: 2011/7/15
> > > Subject: Brightness on HP EliteBook 8460p
> > > To: linux-acpi@vger.kernel.org
> > > 
> > > 
> > > Hello,
> > > 
> > > on my HP EliteBook 8460p is not possible to set display brightness
> > > when ACPI
> > > is enabled in kernel. Entries in sysfs is properly created without
> > > errors. But
> > > when I try write any value
> > > to /sys/class/backlight/acpi_video0/brightness
> > > nothing happened (and no error is in dmesg). When I press Fn key for
> > > chaining
> > > display brightness kernel send correct key event (tested with xev)
> > > but
> > > nothing
> > > happened too.
> > > 
> > > When I disabled ACPI (acpi=off in kernel command line) all Fn keys
> > > are
> > > broken
> > > and not working (no events in xev). But brightness keys working (I
> > > think on HW
> > > level, because xev does not see it) - increase and decrease display
> > > brightness.
> > > 
> > > So what can I do with my notebook? I think that there is error/bug
> > > in
> > > BIOS or
> > > ACPI because with disabled ACPI brightness working. But with
> > > disabled
> > > ACPI is
> > > notebook unuseable (no battery info, no Fn keys, no WIFI rfkill,
> > > ...).
> > > Can
> > > somebody help me with this problem?
> > > 
> > > --
> > > Pali Rohár
> > > pali.rohar@gmail.com
> > 
> > You can try to put kernel parameter:
> > 	acpi_osi="!Windows 2009"
> > 
> > to /boot/grub/menu.lst, then reboot look at maybe better.
> > 
> > And,
> > could you please kindly share DSDT and dmidecode to me?
> > 
> > Plesae login by root then:
> > 	% acpidump > acpidump.dat
> > 	% dmidecode > dmidecode.log
> > 
> > Thanks a lot!
> > Joey Lee
> 
> Hello,
> 
> adding any acpi_osi values did not changed anything (also tried other osi
> strings from decompiled DSDT table). Brightness problem is in both BIOS and
> UEFI boot mode.
> 
> I attached acpidump and dmidecode output from bios and uefi mode too.

Did you find way how to control display brightness?

-- 
Pali Rohár
pali.rohar@gmail.com

[-- Attachment #2: This is a digitally signed message part. --]
[-- Type: application/pgp-signature, Size: 198 bytes --]

Re: Fwd: Brightness on HP EliteBook 8460p

[joeyli]

Hi Pali, 

於 日，2011-12-18 於 11:59 +0100，Pali Rohár 提到：
> On Friday 09 December 2011 16:46:29 Pali Rohár wrote:
> > On Friday 09 December 2011 22:49:09 joeyli wrote:
> > > Hi Pali,
> > > 
> > > 於 五，2011-12-09 於 22:36 +0800，Li Joey 提到：
> > > 
> > > > ---------- Forwarded message ----------
> > > > From: Pali Rohár <pali.rohar@gmail.com>
> > > > Date: 2011/7/15
> > > > Subject: Brightness on HP EliteBook 8460p
> > > > To: linux-acpi@vger.kernel.org
> > > > 
> > > > 
> > > > Hello,
> > > > 
> > > > on my HP EliteBook 8460p is not possible to set display brightness
> > > > when ACPI
> > > > is enabled in kernel. Entries in sysfs is properly created without
> > > > errors. But
> > > > when I try write any value
> > > > to /sys/class/backlight/acpi_video0/brightness
> > > > nothing happened (and no error is in dmesg). When I press Fn key for
> > > > chaining
> > > > display brightness kernel send correct key event (tested with xev)
> > > > but
> > > > nothing
> > > > happened too.
> > > > 
> > > > When I disabled ACPI (acpi=off in kernel command line) all Fn keys
> > > > are
> > > > broken
> > > > and not working (no events in xev). But brightness keys working (I
> > > > think on HW
> > > > level, because xev does not see it) - increase and decrease display
> > > > brightness.
> > > > 
> > > > So what can I do with my notebook? I think that there is error/bug
> > > > in
> > > > BIOS or
> > > > ACPI because with disabled ACPI brightness working. But with
> > > > disabled
> > > > ACPI is
> > > > notebook unuseable (no battery info, no Fn keys, no WIFI rfkill,
> > > > ...).
> > > > Can
> > > > somebody help me with this problem?
> > > > 
> > > > --
> > > > Pali Rohár
> > > > pali.rohar@gmail.com
> > > 
> > > You can try to put kernel parameter:
> > > 	acpi_osi="!Windows 2009"
> > > 
> > > to /boot/grub/menu.lst, then reboot look at maybe better.
> > > 
> > > And,
> > > could you please kindly share DSDT and dmidecode to me?
> > > 
> > > Plesae login by root then:
> > > 	% acpidump > acpidump.dat
> > > 	% dmidecode > dmidecode.log
> > > 
> > > Thanks a lot!
> > > Joey Lee
> > 
> > Hello,
> > 
> > adding any acpi_osi values did not changed anything (also tried other osi
> > strings from decompiled DSDT table). Brightness problem is in both BIOS and
> > UEFI boot mode.
> > 
> > I attached acpidump and dmidecode output from bios and uefi mode too.
> 
> Did you find way how to control display brightness?
> 
> -- 
> Pali Rohár
> pali.rohar@gmail.com

I am really sorry for I am sticking on another tough issue.
I will look at your DSDT tomorrow.


Thanks
Joey Lee


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Re: Fwd: Brightness on HP EliteBook 8460p

[joeyli]

於 日，2011-12-18 於 23:47 +0800，joeyli 提到：
> Hi Pali, 
> 
> 於 日，2011-12-18 於 11:59 +0100，Pali Rohár 提到：
> > On Friday 09 December 2011 16:46:29 Pali Rohár wrote:
> > > On Friday 09 December 2011 22:49:09 joeyli wrote:
> > > > Hi Pali,
> > > > 
> > > > 於 五，2011-12-09 於 22:36 +0800，Li Joey 提到：
> > > > 
> > > > > ---------- Forwarded message ----------
> > > > > From: Pali Rohár <pali.rohar@gmail.com>
> > > > > Date: 2011/7/15
> > > > > Subject: Brightness on HP EliteBook 8460p
> > > > > To: linux-acpi@vger.kernel.org
> > > > > 
> > > > > 
> > > > > Hello,
> > > > > 
> > > > > on my HP EliteBook 8460p is not possible to set display brightness
> > > > > when ACPI
> > > > > is enabled in kernel. Entries in sysfs is properly created without
> > > > > errors. But
> > > > > when I try write any value
> > > > > to /sys/class/backlight/acpi_video0/brightness
> > > > > nothing happened (and no error is in dmesg). When I press Fn key for
> > > > > chaining
> > > > > display brightness kernel send correct key event (tested with xev)
> > > > > but
> > > > > nothing
> > > > > happened too.
> > > > > 
> > > > > When I disabled ACPI (acpi=off in kernel command line) all Fn keys
> > > > > are
> > > > > broken
> > > > > and not working (no events in xev). But brightness keys working (I
> > > > > think on HW
> > > > > level, because xev does not see it) - increase and decrease display
> > > > > brightness.
> > > > > 
> > > > > So what can I do with my notebook? I think that there is error/bug
> > > > > in
> > > > > BIOS or
> > > > > ACPI because with disabled ACPI brightness working. But with
> > > > > disabled
> > > > > ACPI is
> > > > > notebook unuseable (no battery info, no Fn keys, no WIFI rfkill,
> > > > > ...).
> > > > > Can
> > > > > somebody help me with this problem?
> > > > > 
> > > > > --
> > > > > Pali Rohár
> > > > > pali.rohar@gmail.com
> > > > 
> > > > You can try to put kernel parameter:
> > > > 	acpi_osi="!Windows 2009"
> > > > 
> > > > to /boot/grub/menu.lst, then reboot look at maybe better.
> > > > 
> > > > And,
> > > > could you please kindly share DSDT and dmidecode to me?
> > > > 
> > > > Plesae login by root then:
> > > > 	% acpidump > acpidump.dat
> > > > 	% dmidecode > dmidecode.log
> > > > 
> > > > Thanks a lot!
> > > > Joey Lee
> > > 
> > > Hello,
> > > 
> > > adding any acpi_osi values did not changed anything (also tried other osi
> > > strings from decompiled DSDT table). Brightness problem is in both BIOS and
> > > UEFI boot mode.
> > > 
> > > I attached acpidump and dmidecode output from bios and uefi mode too.
> > 
> > Did you find way how to control display brightness?
> > 
> > -- 
> > Pali Rohár
> > pali.rohar@gmail.com
> 
> I am really sorry for I am sticking on another tough issue.
> I will look at your DSDT tomorrow.
> 
> 
> Thanks
> Joey Lee
> 

I just look at the DSDT of HP EliteBook, this machine check _OS name
string, it's essentially obsolete.

Please add the following kernel parameter to /boot/grub/menu.lst:
	acpi_os_name="Windows 2009"

Let's by-pass the _OS name check first, hope it fix this issue.


Thanks
Joey Lee

Re: Fwd: Brightness on HP EliteBook 8460p

[Pali Rohár]

[-- Attachment #1: Type: text/plain, Size: 3857 bytes --]

On Tuesday 20 December 2011 16:13:39 joeyli wrote:
> 於 日，2011-12-18 於 23:47 +0800，joeyli 提到：
> 
> > Hi Pali,
> > 
> > 於 日，2011-12-18 於 11:59 +0100，Pali Rohár 提到：
> > 
> > > On Friday 09 December 2011 16:46:29 Pali Rohár wrote:
> > > > On Friday 09 December 2011 22:49:09 joeyli wrote:
> > > > > Hi Pali,
> > > > > 
> > > > > 於 五，2011-12-09 於 22:36 +0800，Li Joey 提到：
> > > > > 
> > > > > > ---------- Forwarded message ----------
> > > > > > From: Pali Rohár <pali.rohar@gmail.com>
> > > > > > Date: 2011/7/15
> > > > > > Subject: Brightness on HP EliteBook 8460p
> > > > > > To: linux-acpi@vger.kernel.org
> > > > > > 
> > > > > > 
> > > > > > Hello,
> > > > > > 
> > > > > > on my HP EliteBook 8460p is not possible to set display
> > > > > > brightness when ACPI
> > > > > > is enabled in kernel. Entries in sysfs is properly
> > > > > > created without errors. But
> > > > > > when I try write any value
> > > > > > to /sys/class/backlight/acpi_video0/brightness
> > > > > > nothing happened (and no error is in dmesg). When I
> > > > > > press Fn key for chaining
> > > > > > display brightness kernel send correct key event (tested
> > > > > > with xev) but
> > > > > > nothing
> > > > > > happened too.
> > > > > > 
> > > > > > When I disabled ACPI (acpi=off in kernel command line)
> > > > > > all Fn keys are
> > > > > > broken
> > > > > > and not working (no events in xev). But brightness keys
> > > > > > working (I think on HW
> > > > > > level, because xev does not see it) - increase and
> > > > > > decrease display brightness.
> > > > > > 
> > > > > > So what can I do with my notebook? I think that there is
> > > > > > error/bug in
> > > > > > BIOS or
> > > > > > ACPI because with disabled ACPI brightness working. But
> > > > > > with
> > > > > > disabled
> > > > > > ACPI is
> > > > > > notebook unuseable (no battery info, no Fn keys, no WIFI
> > > > > > rfkill,
> > > > > > ...).
> > > > > > Can
> > > > > > somebody help me with this problem?
> > > > > > 
> > > > > > --
> > > > > > Pali Rohár
> > > > > > pali.rohar@gmail.com
> > > > > 
> > > > > You can try to put kernel parameter:
> > > > > 	acpi_osi="!Windows 2009"
> > > > > 
> > > > > to /boot/grub/menu.lst, then reboot look at maybe better.
> > > > > 
> > > > > And,
> > > > > could you please kindly share DSDT and dmidecode to me?
> > > > > 
> > > > > Plesae login by root then:
> > > > > 	% acpidump > acpidump.dat
> > > > > 	% dmidecode > dmidecode.log
> > > > > 
> > > > > Thanks a lot!
> > > > > Joey Lee
> > > > 
> > > > Hello,
> > > > 
> > > > adding any acpi_osi values did not changed anything (also tried
> > > > other osi strings from decompiled DSDT table). Brightness
> > > > problem is in both BIOS and UEFI boot mode.
> > > > 
> > > > I attached acpidump and dmidecode output from bios and uefi mode
> > > > too.
> > > 
> > > Did you find way how to control display brightness?
> > 
> > I am really sorry for I am sticking on another tough issue.
> > I will look at your DSDT tomorrow.
> > 
> > 
> > Thanks
> > Joey Lee
> 
> I just look at the DSDT of HP EliteBook, this machine check _OS name
> string, it's essentially obsolete.
> 
> Please add the following kernel parameter to /boot/grub/menu.lst:
> 	acpi_os_name="Windows 2009"
> 
> Let's by-pass the _OS name check first, hope it fix this issue.
> 
> 
> Thanks
> Joey Lee

Hello,

I tried to add one of these acpi_os_name into grub kernel command line:

acpi_os_name="Windows 2009"
acpi_os_name="Windows 2006"
acpi_os_name="Windows 2001"
acpi_os_name="Windows 2001 SP1"
acpi_os_name="Windows 2001 SP2"

but brightness control (via /sys/class/backlight/acpi_video0/brightness) did 
not worked.

-- 
Pali Rohár
pali.rohar@gmail.com

[-- Attachment #2: This is a digitally signed message part. --]
[-- Type: application/pgp-signature, Size: 198 bytes --]

Re: Fwd: Brightness on HP EliteBook 8460p

[joeyli]

於 二，2011-12-20 於 14:20 +0100，Pali Rohár 提到：
> On Tuesday 20 December 2011 16:13:39 joeyli wrote:
> > > > > 
> > > > > adding any acpi_osi values did not changed anything (also tried
> > > > > other osi strings from decompiled DSDT table). Brightness
> > > > > problem is in both BIOS and UEFI boot mode.
> > > > > 
> > > > > I attached acpidump and dmidecode output from bios and uefi mode
> > > > > too.
> > > > 
> > > > Did you find way how to control display brightness?
> > > 
> > > I am really sorry for I am sticking on another tough issue.
> > > I will look at your DSDT tomorrow.
> > > 
> > > 
> > > Thanks
> > > Joey Lee
> > 
> > I just look at the DSDT of HP EliteBook, this machine check _OS name
> > string, it's essentially obsolete.
> > 
> > Please add the following kernel parameter to /boot/grub/menu.lst:
> > 	acpi_os_name="Windows 2009"
> > 
> > Let's by-pass the _OS name check first, hope it fix this issue.
> > 
> > 
> > Thanks
> > Joey Lee
> 
> Hello,
> 
> I tried to add one of these acpi_os_name into grub kernel command line:
> 
> acpi_os_name="Windows 2009"
> acpi_os_name="Windows 2006"
> acpi_os_name="Windows 2001"
> acpi_os_name="Windows 2001 SP1"
> acpi_os_name="Windows 2001 SP2"
> 
> but brightness control (via /sys/class/backlight/acpi_video0/brightness) did 
> not worked.
> 
> -- 
> Pali Rohár
> pali.rohar@gmail.com

In DSDT, check the following 3 OS name strings, just need feed a string
not in list could be by-pass _OS check:

    Name (OSID, Package (0x03)
    {
        "Microsoft Windows",
        "Microsoft WindowsME: Millennium Edition",
        "Microsoft Windows NT"                  /* match with Linux kernel's _OS name default define */
    })

Unfortunately, just by-pass _OS check cann't fix your problem. I need
spend time to dig more detail in your DSDT.
Could you please attached your whole dmesg log that cover system boot
and press brightness control key a couple of times?


Thanks a lot!
Joey Lee

Re: Fwd: Brightness on HP EliteBook 8460p

[joeyli]

於 三，2011-12-21 於 10:16 +0800，joeyli 提到：
> 於 二，2011-12-20 於 14:20 +0100，Pali Rohár 提到：
> > On Tuesday 20 December 2011 16:13:39 joeyli wrote:
> > > > > > 
> > > > > > adding any acpi_osi values did not changed anything (also tried
> > > > > > other osi strings from decompiled DSDT table). Brightness
> > > > > > problem is in both BIOS and UEFI boot mode.
> > > > > > 
> > > > > > I attached acpidump and dmidecode output from bios and uefi mode
> > > > > > too.
> > > > > 
> > > > > Did you find way how to control display brightness?
> > > > 
> > > > I am really sorry for I am sticking on another tough issue.
> > > > I will look at your DSDT tomorrow.
> > > > 
> > > > 
> > > > Thanks
> > > > Joey Lee
> > > 
> > > I just look at the DSDT of HP EliteBook, this machine check _OS name
> > > string, it's essentially obsolete.
> > > 
> > > Please add the following kernel parameter to /boot/grub/menu.lst:
> > > 	acpi_os_name="Windows 2009"
> > > 
> > > Let's by-pass the _OS name check first, hope it fix this issue.
> > > 
> > > 
> > > Thanks
> > > Joey Lee
> > 
> > Hello,
> > 
> > I tried to add one of these acpi_os_name into grub kernel command line:
> > 
> > acpi_os_name="Windows 2009"
> > acpi_os_name="Windows 2006"
> > acpi_os_name="Windows 2001"
> > acpi_os_name="Windows 2001 SP1"
> > acpi_os_name="Windows 2001 SP2"
> > 
> > but brightness control (via /sys/class/backlight/acpi_video0/brightness) did 
> > not worked.
> > 
> > -- 
> > Pali Rohár
> > pali.rohar@gmail.com
> 
> In DSDT, check the following 3 OS name strings, just need feed a string
> not in list could be by-pass _OS check:
> 
>     Name (OSID, Package (0x03)
>     {
>         "Microsoft Windows",
>         "Microsoft WindowsME: Millennium Edition",
>         "Microsoft Windows NT"                  /* match with Linux kernel's _OS name default define */
>     })
> 
> Unfortunately, just by-pass _OS check cann't fix your problem. I need
> spend time to dig more detail in your DSDT.
> Could you please attached your whole dmesg log that cover system boot
> and press brightness control key a couple of times?
> 
> 
> Thanks a lot!
> Joey Lee

Sorry! forgot say! could you please also enable the acpi debug messages
in kernel parameter?
Just need add the following kernel parameter to /boot/grub/menu.lst:

	acpi.debug_level=0x2 acpi.debug_layer=0xFFFFFFFF

Please attached dmesg and messages log.


Thanks a lot!
Joey Lee

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Re: Fwd: Brightness on HP EliteBook 8460p

[Pali Rohár]

[-- Attachment #1: Type: text/plain, Size: 334 bytes --]

On Wednesday 21 December 2011 12:45:07 Pali Rohár wrote:
> Hello,
> 
> I tried to boot with all 3 strings in acpi_os_name, but nothing was changed.
> I'm attaching dmesg outputs, one from BIOS mode, one from UEFI mode. Both
> are with "Microsoft Windows NT".

Did you looked at my logs?

-- 
Pali Rohár
pali.rohar@gmail.com

[-- Attachment #2: This is a digitally signed message part. --]
[-- Type: application/pgp-signature, Size: 198 bytes --]

Re: Fwd: Brightness on HP EliteBook 8460p

[joeyli]

Hi Pali, 

Sorry for I am late reply you.

於 二，2012-01-17 於 19:10 +0100，Pali Rohár 提到：
> On Wednesday 21 December 2011 12:45:07 Pali Rohár wrote:
> > Hello,
> > 
> > I tried to boot with all 3 strings in acpi_os_name, but nothing was changed.
> > I'm attaching dmesg outputs, one from BIOS mode, one from UEFI mode. Both
> > are with "Microsoft Windows NT".
> 
> Did you looked at my logs?
> 
> -- 
> Pali Rohár
> pali.rohar@gmail.com

I checked your dmesg log, found the acpi_os_name kernel parameter is :

[    0.000000] Command line: BOOT_IMAGE=/vmlinuz-3.2.0-4-generic
root=UUID=4ec6272a-8551-40f3-a1b1-3e10984f3e69 ro pcie_aspm=force
acpi.debug_level=0x2 acpi.debug_layer=0xFFFFFFFF "acpi_os_name=Microsoft
Windows NT" splash vt.handoff=7

We still need by-pass the os name check in DSDT when test function key,
please help to feed:
	acpi_os_name="Windows 2009"

And,
looks like the acpi debug level not enough, please kindly change acpi
debug parameter to:
	acpi.debug_level=0xF acpi.debug_layer=0xFFFFFFFF log_buf_len=5M

summary:
	acpi.debug_level=0xF acpi.debug_layer=0xFFFFFFFF log_buf_len=5M acpi_os_name="Windows 2009"


Thanks a lot!
Joey Lee

Re: Fwd: Brightness on HP EliteBook 8460p

[joeyli]

於 五，2012-01-20 於 11:12 +0800，joeyli 提到：
> Hi Pali, 
> 
> Sorry for I am late reply you.
> 
> 於 二，2012-01-17 於 19:10 +0100，Pali Rohár 提到：
> > On Wednesday 21 December 2011 12:45:07 Pali Rohár wrote:
> > > Hello,
> > > 
> > > I tried to boot with all 3 strings in acpi_os_name, but nothing was changed.
> > > I'm attaching dmesg outputs, one from BIOS mode, one from UEFI mode. Both
> > > are with "Microsoft Windows NT".
> > 
> > Did you looked at my logs?
> > 
> > -- 
> > Pali Rohár
> > pali.rohar@gmail.com
> 
> I checked your dmesg log, found the acpi_os_name kernel parameter is :
> 
> [    0.000000] Command line: BOOT_IMAGE=/vmlinuz-3.2.0-4-generic
> root=UUID=4ec6272a-8551-40f3-a1b1-3e10984f3e69 ro pcie_aspm=force
> acpi.debug_level=0x2 acpi.debug_layer=0xFFFFFFFF "acpi_os_name=Microsoft
> Windows NT" splash vt.handoff=7
> 
> We still need by-pass the os name check in DSDT when test function key,
> please help to feed:
> 	acpi_os_name="Windows 2009"
> 
> And,
> looks like the acpi debug level not enough, please kindly change acpi
> debug parameter to:
> 	acpi.debug_level=0xF acpi.debug_layer=0xFFFFFFFF log_buf_len=5M
> 
> summary:
> 	acpi.debug_level=0xF acpi.debug_layer=0xFFFFFFFF log_buf_len=5M acpi_os_name="Windows 2009"
> 

Forgot remind, 
please remember press brightness function key a couple of times before
you dump the dmesg and messages log.


Thanks a lot!
Joey Lee

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Re: Fwd: Brightness on HP EliteBook 8460p

[Pali Rohár]

[-- Attachment #1: Type: text/plain, Size: 2623 bytes --]

On Friday 20 January 2012 17:55:57 Pali Rohár wrote:
> On Friday 20 January 2012 11:28:59 joeyli wrote:
> > 於 五，2012-01-20 於 11:12 +0800，joeyli 提到：
> > 
> > > Hi Pali,
> > > 
> > > Sorry for I am late reply you.
> > > 
> > > 於 二，2012-01-17 於 19:10 +0100，Pali Rohár 提到：
> > > 
> > > > On Wednesday 21 December 2011 12:45:07 Pali Rohár wrote:
> > > > > Hello,
> > > > > 
> > > > > I tried to boot with all 3 strings in acpi_os_name, but nothing was
> > > > > changed. I'm attaching dmesg outputs, one from BIOS mode, one from
> > > > > UEFI mode. Both are with "Microsoft Windows NT".
> > > > 
> > > > Did you looked at my logs?
> > > 
> > > I checked your dmesg log, found the acpi_os_name kernel parameter is :
> > > 
> > > [    0.000000] Command line: BOOT_IMAGE=/vmlinuz-3.2.0-4-generic
> > > root=UUID=4ec6272a-8551-40f3-a1b1-3e10984f3e69 ro pcie_aspm=force
> > > acpi.debug_level=0x2 acpi.debug_layer=0xFFFFFFFF "acpi_os_name=Microsoft
> > > Windows NT" splash vt.handoff=7
> > > 
> > > We still need by-pass the os name check in DSDT when test function key,
> > > 
> > > please help to feed:
> > > 	acpi_os_name="Windows 2009"
> > > 
> > > And,
> > > looks like the acpi debug level not enough, please kindly change acpi
> > > 
> > > debug parameter to:
> > > 	acpi.debug_level=0xF acpi.debug_layer=0xFFFFFFFF log_buf_len=5M
> > > 
> > > summary:
> > > 	acpi.debug_level=0xF acpi.debug_layer=0xFFFFFFFF log_buf_len=5M
> > > 	acpi_os_name="Windows 2009"
> > 
> > Forgot remind,
> > please remember press brightness function key a couple of times before
> > you dump the dmesg and messages log.
> > 
> > 
> > Thanks a lot!
> > Joey Lee
> 
> Hello,
> 
> there was no acpi log, so I recompiled ubuntu kernel with
> CONFIG_ACPI_DEBUG=y and CONFIG_ACPI_DEBUG_FUNC_TRACE. Then I started kernel
> with your params.
> 
> Now I'm attaching very long debug output. I belive it will be now usefull.
> 
> Pressing brightness keys did not show anything in log.
> 
> After writing 0 to /sys/class/backlight/acpi_video0/brightness in log
> appear: [   57.675070] [ACPI Debug]  Integer 0x000000000000000B
> ...
> 
> And after writing 10:
> [   99.865208] [ACPI Debug]  Integer 0x0000000000000048
> [   99.865295]   evmisc-0120 [4294967289] ev_queue_notify_reques:
> Dispatching Notify on [DGFX] Node ffff880136246c80 Value 0xD0 (**Device
> Specific**) [   99.865350]    video-1474 [4294967289] video_bus_notify     
> : Unsupported event [0xd0]

Do you need more logs? Or is this enought?

-- 
Pali Rohár
pali.rohar@gmail.com

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Re: Fwd: Brightness on HP EliteBook 8460p

[Joey Lee]

[-- Attachment #1.1: Type: text/plain, Size: 7068 bytes --]

Add Cc. to dri mail

Hi Pali, 

於 五，2012-02-03 於 16:24 +0100，Pali Rohár 提到：
> On Friday 20 January 2012 17:55:57 Pali Rohár wrote:
> > On Friday 20 January 2012 11:28:59 joeyli wrote:
> > > 於 五，2012-01-20 於 11:12 +0800，joeyli 提到：
> > > 
> > > > Hi Pali,
> > > > 
> > > > Sorry for I am late reply you.
> > > > 
> > > > 於 二，2012-01-17 於 19:10 +0100，Pali Rohár 提到：
> > > > 
> > > > > On Wednesday 21 December 2011 12:45:07 Pali Rohár wrote:
> > > > > > Hello,
> > > > > > 
> > > > > > I tried to boot with all 3 strings in acpi_os_name, but nothing was
> > > > > > changed. I'm attaching dmesg outputs, one from BIOS mode, one from
> > > > > > UEFI mode. Both are with "Microsoft Windows NT".
> > > > > 
> > > > > Did you looked at my logs?
> > > > 
> > > > I checked your dmesg log, found the acpi_os_name kernel parameter is :
> > > > 
> > > > [    0.000000] Command line: BOOT_IMAGE=/vmlinuz-3.2.0-4-generic
> > > > root=UUID=4ec6272a-8551-40f3-a1b1-3e10984f3e69 ro pcie_aspm=force
> > > > acpi.debug_level=0x2 acpi.debug_layer=0xFFFFFFFF "acpi_os_name=Microsoft
> > > > Windows NT" splash vt.handoff=7
> > > > 
> > > > We still need by-pass the os name check in DSDT when test function key,
> > > > 
> > > > please help to feed:
> > > > 	acpi_os_name="Windows 2009"
> > > > 
> > > > And,
> > > > looks like the acpi debug level not enough, please kindly change acpi
> > > > 
> > > > debug parameter to:
> > > > 	acpi.debug_level=0xF acpi.debug_layer=0xFFFFFFFF log_buf_len=5M
> > > > 
> > > > summary:
> > > > 	acpi.debug_level=0xF acpi.debug_layer=0xFFFFFFFF log_buf_len=5M
> > > > 	acpi_os_name="Windows 2009"
> > > 
> > > Forgot remind,
> > > please remember press brightness function key a couple of times before
> > > you dump the dmesg and messages log.
> > > 
> > > 
> > > Thanks a lot!
> > > Joey Lee
> > 
> > Hello,
> > 
> > there was no acpi log, so I recompiled ubuntu kernel with
> > CONFIG_ACPI_DEBUG=y and CONFIG_ACPI_DEBUG_FUNC_TRACE. Then I started kernel
> > with your params.
> > 
> > Now I'm attaching very long debug output. I belive it will be now usefull.
> > 
> > Pressing brightness keys did not show anything in log.
> > 
> > After writing 0 to /sys/class/backlight/acpi_video0/brightness in log
> > appear: [   57.675070] [ACPI Debug]  Integer 0x000000000000000B
> > ...
> > 
> > And after writing 10:
> > [   99.865208] [ACPI Debug]  Integer 0x0000000000000048
> > [   99.865295]   evmisc-0120 [4294967289] ev_queue_notify_reques:
> > Dispatching Notify on [DGFX] Node ffff880136246c80 Value 0xD0 (**Device
> > Specific**) [   99.865350]    video-1474 [4294967289] video_bus_notify     
> > : Unsupported event [0xd0]
> 
> Do you need more logs? Or is this enought?
> 

Yes, as you point out, this is a doubt for video bus received 0xD0 event
but nobody take care it.

Traced dsdt of EliteBook 8460p from you, the _BCM like this:

    Method (_BCM, 1, Serialized)                /* ATI _BCM, per log, run this _BCM */
    {  
        Store (\_SB.BCM (Arg0), Local0)         /* set next level, normally return 0x1 if XP sp2 or later */
        If (Local0)                             /* if XP sp2 or later */
        {  
            Store (BRID, Local1)
            If (LEqual (SBRV (), 0x00))         /* normally SBRV return 1, will not emit SMI */
            {  
                \_SB.SSMI (0xEA74, 0x04, Local1, 0x00, 0x00)
            }

            Signal (\_SB.BEVT)          /* emit BEVT event, HKFR (HotkeyFunctionResponse) waiting it, but why? */
        }
    }

_BCM call SBRV to setup brightness value to variable ABRI:

Method (SBRV, 0, Serialized)            /* call by ATI _BCM */
{  
    Store (\_SB.SBRC (), ABRI)          /* SBRC() return the brightness value, why store to ABRI? only used in PEGP.DGFX.AFN2 */
    Or (PSBR, 0x80, PSBR)
    Notify (^, 0xD0)                    /* notify method's parent: PEGP.DGFX by 0xD0 */
    Return (0x01)                       /* normally return 1 */
}The PEGP.DGFX acpi device was binding to acpi/video driver, the above
ASL code emit a 0xD0 bus event to video.c but cann't process it. Even we
add a new bus event in video.c and generate a acpi event, there still
need another acpi driver should take care it.

I thought this acpi event might need take care by radeon drm, but I am
not good for radeon, need more help.

Per your acpi debug log, the brightness value was changed normally when
you access _BCM:

83133 Jan 20 17:17:51 Pali-EliteBook kernel: [   57.674669] ACPI: Execute Method [\_SB_.PCI0.PEGP.DGFX.LCD_._BCM] (Node ffff8      801362472a8)		# start test _BCM manually
83134 Jan 20 17:17:51 Pali-EliteBook kernel: [   57.674736] exregion-0199 [01] ex_system_memory_space: System-Memory (width 8      ) R/W 0 Address=00000000BF7ACE1C
83135 Jan 20 17:17:51 Pali-EliteBook kernel: [   57.674748] exregion-0199 [02] ex_system_memory_space: System-Memory (width 8      ) R/W 1 Address=00000000BF7ACE1C
...
83179 Jan 20 17:17:51 Pali-EliteBook kernel: [   57.675070] [ACPI Debug]  Integer 0x000000000000000B	# brightness value is 11
83180 Jan 20 17:17:51 Pali-EliteBook kernel: [   57.675090]   evmisc-0120 [4294967289] ev_queue_notify_reques: Dispatching No      tify on [DGFX] Node ffff880136246c80 Value 0xD0 (**Device Specific**)
83181 Jan 20 17:17:51 Pali-EliteBook kernel: [   57.675099]    video-1474 [4294967288] video_bus_notify      : Unsupported event [0xd0]
...
83197 Jan 20 17:18:33 Pali-EliteBook kernel: [   99.863593] ACPI: Execute Method [\_SB_.PCI0.PEGP.DGFX.LCD_._BCM] (Node ffff8      801362472a8)
83198 Jan 20 17:18:33 Pali-EliteBook kernel: [   99.863817] exregion-0199 [01] ex_system_memory_space: System-Memory (width 8      ) R/W 0 Address=00000000BF7ACE1C
83243 Jan 20 17:18:33 Pali-EliteBook kernel: [   99.865208] [ACPI Debug]  Integer 0x0000000000000048	# brightness value is 72 
83244 Jan 20 17:18:33 Pali-EliteBook kernel: [   99.865295]   evmisc-0120 [4294967289] ev_queue_notify_reques: Dispatching Notify on [DGFX] Node ffff880136246c80 Value 0xD0 (**Device Specific**)
83245 Jan 20 17:18:33 Pali-EliteBook kernel: [   99.865350]    video-1474 [4294967289] video_bus_notify      : Unsupported event [0xd0]

The brightness values are 11(0x0B) and 72(0x48), that means the BCM
method return a good value and set to ABRI, ABRI waiting the guy who
take the 0xD0 event to read then change brightness.

Another doubt is the latest statement in _BCM, it emit a BEVT event:

Signal (\_SB.BEVT)

Only HKFR(HotkeyFunctionResponse) method is waiting this event, it
should related to how the HP implement brightness function key on
Windows through wmi.

Of course this issue really close related to video driver, even more,
we might need to know hp wmi for how to implement on Windows.

Unfortunately, sorry for I don't have any solution to you, now, I will
continue to trace and find any support from other experts.


Thanks a lot!
Joey Lee





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[-- Attachment #2: Type: text/plain, Size: 159 bytes --]

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Re: Fwd: Brightness on HP EliteBook 8460p

[Joey Lee]

Add Cc. to dri mail

Hi Pali, 

於 五，2012-02-03 於 16:24 +0100，Pali Rohár 提到：
> On Friday 20 January 2012 17:55:57 Pali Rohár wrote:
> > On Friday 20 January 2012 11:28:59 joeyli wrote:
> > > 於 五，2012-01-20 於 11:12 +0800，joeyli 提到：
> > > 
> > > > Hi Pali,
> > > > 
> > > > Sorry for I am late reply you.
> > > > 
> > > > 於 二，2012-01-17 於 19:10 +0100，Pali Rohár 提到：
> > > > 
> > > > > On Wednesday 21 December 2011 12:45:07 Pali Rohár wrote:
> > > > > > Hello,
> > > > > > 
> > > > > > I tried to boot with all 3 strings in acpi_os_name, but nothing was
> > > > > > changed. I'm attaching dmesg outputs, one from BIOS mode, one from
> > > > > > UEFI mode. Both are with "Microsoft Windows NT".
> > > > > 
> > > > > Did you looked at my logs?
> > > > 
> > > > I checked your dmesg log, found the acpi_os_name kernel parameter is :
> > > > 
> > > > [    0.000000] Command line: BOOT_IMAGE=/vmlinuz-3.2.0-4-generic
> > > > root=UUID=4ec6272a-8551-40f3-a1b1-3e10984f3e69 ro pcie_aspm=force
> > > > acpi.debug_level=0x2 acpi.debug_layer=0xFFFFFFFF "acpi_os_name=Microsoft
> > > > Windows NT" splash vt.handoff=7
> > > > 
> > > > We still need by-pass the os name check in DSDT when test function key,
> > > > 
> > > > please help to feed:
> > > > 	acpi_os_name="Windows 2009"
> > > > 
> > > > And,
> > > > looks like the acpi debug level not enough, please kindly change acpi
> > > > 
> > > > debug parameter to:
> > > > 	acpi.debug_level=0xF acpi.debug_layer=0xFFFFFFFF log_buf_len=5M
> > > > 
> > > > summary:
> > > > 	acpi.debug_level=0xF acpi.debug_layer=0xFFFFFFFF log_buf_len=5M
> > > > 	acpi_os_name="Windows 2009"
> > > 
> > > Forgot remind,
> > > please remember press brightness function key a couple of times before
> > > you dump the dmesg and messages log.
> > > 
> > > 
> > > Thanks a lot!
> > > Joey Lee
> > 
> > Hello,
> > 
> > there was no acpi log, so I recompiled ubuntu kernel with
> > CONFIG_ACPI_DEBUG=y and CONFIG_ACPI_DEBUG_FUNC_TRACE. Then I started kernel
> > with your params.
> > 
> > Now I'm attaching very long debug output. I belive it will be now usefull.
> > 
> > Pressing brightness keys did not show anything in log.
> > 
> > After writing 0 to /sys/class/backlight/acpi_video0/brightness in log
> > appear: [   57.675070] [ACPI Debug]  Integer 0x000000000000000B
> > ...
> > 
> > And after writing 10:
> > [   99.865208] [ACPI Debug]  Integer 0x0000000000000048
> > [   99.865295]   evmisc-0120 [4294967289] ev_queue_notify_reques:
> > Dispatching Notify on [DGFX] Node ffff880136246c80 Value 0xD0 (**Device
> > Specific**) [   99.865350]    video-1474 [4294967289] video_bus_notify     
> > : Unsupported event [0xd0]
> 
> Do you need more logs? Or is this enought?
> 

Yes, as you point out, this is a doubt for video bus received 0xD0 event
but nobody take care it.

Traced dsdt of EliteBook 8460p from you, the _BCM like this:

    Method (_BCM, 1, Serialized)                /* ATI _BCM, per log, run this _BCM */
    {  
        Store (\_SB.BCM (Arg0), Local0)         /* set next level, normally return 0x1 if XP sp2 or later */
        If (Local0)                             /* if XP sp2 or later */
        {  
            Store (BRID, Local1)
            If (LEqual (SBRV (), 0x00))         /* normally SBRV return 1, will not emit SMI */
            {  
                \_SB.SSMI (0xEA74, 0x04, Local1, 0x00, 0x00)
            }

            Signal (\_SB.BEVT)          /* emit BEVT event, HKFR (HotkeyFunctionResponse) waiting it, but why? */
        }
    }

_BCM call SBRV to setup brightness value to variable ABRI:

Method (SBRV, 0, Serialized)            /* call by ATI _BCM */
{  
    Store (\_SB.SBRC (), ABRI)          /* SBRC() return the brightness value, why store to ABRI? only used in PEGP.DGFX.AFN2 */
    Or (PSBR, 0x80, PSBR)
    Notify (^, 0xD0)                    /* notify method's parent: PEGP.DGFX by 0xD0 */
    Return (0x01)                       /* normally return 1 */
}The PEGP.DGFX acpi device was binding to acpi/video driver, the above
ASL code emit a 0xD0 bus event to video.c but cann't process it. Even we
add a new bus event in video.c and generate a acpi event, there still
need another acpi driver should take care it.

I thought this acpi event might need take care by radeon drm, but I am
not good for radeon, need more help.

Per your acpi debug log, the brightness value was changed normally when
you access _BCM:

83133 Jan 20 17:17:51 Pali-EliteBook kernel: [   57.674669] ACPI: Execute Method [\_SB_.PCI0.PEGP.DGFX.LCD_._BCM] (Node ffff8      801362472a8)		# start test _BCM manually
83134 Jan 20 17:17:51 Pali-EliteBook kernel: [   57.674736] exregion-0199 [01] ex_system_memory_space: System-Memory (width 8      ) R/W 0 Address=00000000BF7ACE1C
83135 Jan 20 17:17:51 Pali-EliteBook kernel: [   57.674748] exregion-0199 [02] ex_system_memory_space: System-Memory (width 8      ) R/W 1 Address=00000000BF7ACE1C
...
83179 Jan 20 17:17:51 Pali-EliteBook kernel: [   57.675070] [ACPI Debug]  Integer 0x000000000000000B	# brightness value is 11
83180 Jan 20 17:17:51 Pali-EliteBook kernel: [   57.675090]   evmisc-0120 [4294967289] ev_queue_notify_reques: Dispatching No      tify on [DGFX] Node ffff880136246c80 Value 0xD0 (**Device Specific**)
83181 Jan 20 17:17:51 Pali-EliteBook kernel: [   57.675099]    video-1474 [4294967288] video_bus_notify      : Unsupported event [0xd0]
...
83197 Jan 20 17:18:33 Pali-EliteBook kernel: [   99.863593] ACPI: Execute Method [\_SB_.PCI0.PEGP.DGFX.LCD_._BCM] (Node ffff8      801362472a8)
83198 Jan 20 17:18:33 Pali-EliteBook kernel: [   99.863817] exregion-0199 [01] ex_system_memory_space: System-Memory (width 8      ) R/W 0 Address=00000000BF7ACE1C
83243 Jan 20 17:18:33 Pali-EliteBook kernel: [   99.865208] [ACPI Debug]  Integer 0x0000000000000048	# brightness value is 72 
83244 Jan 20 17:18:33 Pali-EliteBook kernel: [   99.865295]   evmisc-0120 [4294967289] ev_queue_notify_reques: Dispatching Notify on [DGFX] Node ffff880136246c80 Value 0xD0 (**Device Specific**)
83245 Jan 20 17:18:33 Pali-EliteBook kernel: [   99.865350]    video-1474 [4294967289] video_bus_notify      : Unsupported event [0xd0]

The brightness values are 11(0x0B) and 72(0x48), that means the BCM
method return a good value and set to ABRI, ABRI waiting the guy who
take the 0xD0 event to read then change brightness.

Another doubt is the latest statement in _BCM, it emit a BEVT event:

Signal (\_SB.BEVT)

Only HKFR(HotkeyFunctionResponse) method is waiting this event, it
should related to how the HP implement brightness function key on
Windows through wmi.

Of course this issue really close related to video driver, even more,
we might need to know hp wmi for how to implement on Windows.

Unfortunately, sorry for I don't have any solution to you, now, I will
continue to trace and find any support from other experts.


Thanks a lot!
Joey Lee

Re: Fwd: Brightness on HP EliteBook 8460p

[Pali Rohár]

[-- Attachment #1: Type: text/plain, Size: 8696 bytes --]

On Saturday 04 February 2012 20:19:16 Joey Lee wrote:
> Add Cc. to dri mail
> 
> Hi Pali,
> 
> 於 五，2012-02-03 於 16:24 +0100，Pali Rohár 提到：
> 
> > On Friday 20 January 2012 17:55:57 Pali Rohár wrote:
> > > On Friday 20 January 2012 11:28:59 joeyli wrote:
> > > > 於 五，2012-01-20 於 11:12 +0800，joeyli 提到：
> > > > 
> > > > > Hi Pali,
> > > > > 
> > > > > Sorry for I am late reply you.
> > > > > 
> > > > > 於 二，2012-01-17 於 19:10 +0100，Pali Rohár 提到：
> > > > > 
> > > > > > On Wednesday 21 December 2011 12:45:07 Pali Rohár wrote:
> > > > > > > Hello,
> > > > > > > 
> > > > > > > I tried to boot with all 3 strings in acpi_os_name, but
> > > > > > > nothing was
> > > > > > > changed. I'm attaching dmesg outputs, one from BIOS
> > > > > > > mode, one from
> > > > > > > UEFI mode. Both are with "Microsoft Windows NT".
> > > > > > 
> > > > > > Did you looked at my logs?
> > > > > 
> > > > > I checked your dmesg log, found the acpi_os_name kernel
> > > > > parameter is :
> > > > > 
> > > > > [    0.000000] Command line:
> > > > > BOOT_IMAGE=/vmlinuz-3.2.0-4-generic
> > > > > root=UUID=4ec6272a-8551-40f3-a1b1-3e10984f3e69 ro
> > > > > pcie_aspm=force
> > > > > acpi.debug_level=0x2 acpi.debug_layer=0xFFFFFFFF
> > > > > "acpi_os_name=Microsoft Windows NT" splash vt.handoff=7
> > > > > 
> > > > > We still need by-pass the os name check in DSDT when test
> > > > > function key,> > > > 
> > > > > please help to feed:
> > > > > 	acpi_os_name="Windows 2009"
> > > > > 
> > > > > And,
> > > > > looks like the acpi debug level not enough, please kindly
> > > > > change acpi> > > > 
> > > > > debug parameter to:
> > > > > 	acpi.debug_level=0xF acpi.debug_layer=0xFFFFFFFF
> > > > > 	log_buf_len=5M
> > > > > 
> > > > > summary:
> > > > > 	acpi.debug_level=0xF acpi.debug_layer=0xFFFFFFFF
> > > > > 	log_buf_len=5M
> > > > > 	acpi_os_name="Windows 2009"
> > > > 
> > > > Forgot remind,
> > > > please remember press brightness function key a couple of
> > > > times before you dump the dmesg and messages log.
> > > > 
> > > > 
> > > > Thanks a lot!
> > > > Joey Lee
> > > 
> > > Hello,
> > > 
> > > there was no acpi log, so I recompiled ubuntu kernel with
> > > CONFIG_ACPI_DEBUG=y and CONFIG_ACPI_DEBUG_FUNC_TRACE. Then I
> > > started kernel with your params.
> > > 
> > > Now I'm attaching very long debug output. I belive it will be
> > > now usefull.
> > > 
> > > Pressing brightness keys did not show anything in log.
> > > 
> > > After writing 0 to /sys/class/backlight/acpi_video0/brightness
> > > in log appear: [   57.675070] [ACPI Debug]  Integer
> > > 0x000000000000000B ...
> > > 
> > > And after writing 10:
> > > [   99.865208] [ACPI Debug]  Integer 0x0000000000000048
> > > [   99.865295]   evmisc-0120 [4294967289]
> > > ev_queue_notify_reques:
> > > Dispatching Notify on [DGFX] Node ffff880136246c80 Value 0xD0
> > > (**Device Specific**) [   99.865350]    video-1474 [4294967289]
> > > video_bus_notify> > 
> > > : Unsupported event [0xd0]
> > 
> > Do you need more logs? Or is this enought?
> 
> Yes, as you point out, this is a doubt for video bus received 0xD0
> event but nobody take care it.
> 
> Traced dsdt of EliteBook 8460p from you, the _BCM like this:
> 
>     Method (_BCM, 1, Serialized)                /* ATI _BCM, per
> log, run this _BCM */ {
>         Store (\_SB.BCM (Arg0), Local0)         /* set next level,
> normally return 0x1 if XP sp2 or later */ If (Local0)              
>               /* if XP sp2 or later */ {
>             Store (BRID, Local1)
>             If (LEqual (SBRV (), 0x00))         /* normally SBRV
> return 1, will not emit SMI */ {
>                 \_SB.SSMI (0xEA74, 0x04, Local1, 0x00, 0x00)
>             }
> 
>             Signal (\_SB.BEVT)          /* emit BEVT event, HKFR
> (HotkeyFunctionResponse) waiting it, but why? */ }
>     }
> 
> _BCM call SBRV to setup brightness value to variable ABRI:
> 
> Method (SBRV, 0, Serialized)            /* call by ATI _BCM */
> {
>     Store (\_SB.SBRC (), ABRI)          /* SBRC() return the
> brightness value, why store to ABRI? only used in PEGP.DGFX.AFN2 */
> Or (PSBR, 0x80, PSBR)
>     Notify (^, 0xD0)                    /* notify method's parent:
> PEGP.DGFX by 0xD0 */ Return (0x01)                       /*
> normally return 1 */ }The PEGP.DGFX acpi device was binding to
> acpi/video driver, the above ASL code emit a 0xD0 bus event to
> video.c but cann't process it. Even we add a new bus event in
> video.c and generate a acpi event, there still need another acpi
> driver should take care it.
> 
> I thought this acpi event might need take care by radeon drm, but I
> am not good for radeon, need more help.
> 
> Per your acpi debug log, the brightness value was changed normally
> when you access _BCM:
> 
> 83133 Jan 20 17:17:51 Pali-EliteBook kernel: [   57.674669] ACPI:
> Execute Method [\_SB_.PCI0.PEGP.DGFX.LCD_._BCM] (Node ffff8     
> 801362472a8)		# start test _BCM manually 83134 Jan 20 17:17:51
> Pali-EliteBook kernel: [   57.674736] exregion-0199 [01]
> ex_system_memory_space: System-Memory (width 8      ) R/W 0
> Address=00000000BF7ACE1C 83135 Jan 20 17:17:51 Pali-EliteBook
> kernel: [   57.674748] exregion-0199 [02] ex_system_memory_space:
> System-Memory (width 8      ) R/W 1 Address=00000000BF7ACE1C ...
> 83179 Jan 20 17:17:51 Pali-EliteBook kernel: [   57.675070] [ACPI
> Debug]  Integer 0x000000000000000B	# brightness value is 11 83180
> Jan 20 17:17:51 Pali-EliteBook kernel: [   57.675090]   evmisc-0120
> [4294967289] ev_queue_notify_reques: Dispatching No      tify on
> [DGFX] Node ffff880136246c80 Value 0xD0 (**Device Specific**) 83181
> Jan 20 17:17:51 Pali-EliteBook kernel: [   57.675099]    video-1474
> [4294967288] video_bus_notify      : Unsupported event [0xd0] ...
> 83197 Jan 20 17:18:33 Pali-EliteBook kernel: [   99.863593] ACPI:
> Execute Method [\_SB_.PCI0.PEGP.DGFX.LCD_._BCM] (Node ffff8     
> 801362472a8) 83198 Jan 20 17:18:33 Pali-EliteBook kernel: [  
> 99.863817] exregion-0199 [01] ex_system_memory_space: System-Memory
> (width 8      ) R/W 0 Address=00000000BF7ACE1C 83243 Jan 20
> 17:18:33 Pali-EliteBook kernel: [   99.865208] [ACPI Debug] 
> Integer 0x0000000000000048	# brightness value is 72 83244 Jan 20
> 17:18:33 Pali-EliteBook kernel: [   99.865295]   evmisc-0120
> [4294967289] ev_queue_notify_reques: Dispatching Notify on [DGFX]
> Node ffff880136246c80 Value 0xD0 (**Device Specific**) 83245 Jan 20
> 17:18:33 Pali-EliteBook kernel: [   99.865350]    video-1474
> [4294967289] video_bus_notify      : Unsupported event [0xd0]
> 
> The brightness values are 11(0x0B) and 72(0x48), that means the BCM
> method return a good value and set to ABRI, ABRI waiting the guy who
> take the 0xD0 event to read then change brightness.
> 
> Another doubt is the latest statement in _BCM, it emit a BEVT event:
> 
> Signal (\_SB.BEVT)
> 
> Only HKFR(HotkeyFunctionResponse) method is waiting this event, it
> should related to how the HP implement brightness function key on
> Windows through wmi.
> 
> Of course this issue really close related to video driver, even
> more, we might need to know hp wmi for how to implement on Windows.
> 
> Unfortunately, sorry for I don't have any solution to you, now, I
> will continue to trace and find any support from other experts.
> 
> 
> Thanks a lot!
> Joey Lee

Hi!

now I found that ALS button which enable/disable ambient light sensor 
working with linux and ALS can also decrease/increase brightness.

ALS can be enabled or disabled via WMI (acpi) on linux too. I found 
function which enable ALS in linux kernel. See source code of function 
set_als in hp-wmi.c: http://tomoyo.sourceforge.jp/cgi-
bin/lxr/source/drivers/platform/x86/hp-wmi.c#L443

This function can enable ALS which can decrease brightness (but only 
to specific one level) via WMI. And WMI is ACPI extension, so maybe it 
is really possible to change brightness via acpi without DRI support.

But I do not WMI, ACPI and DSDT code. Can you try to decode what is 
called in acpi when that set_als function in hp-wmi is called? I think 
here in acpi can be some magic which can manipulate with display 
brightness. At least ACPI must call somewhat to change brightness...

Note: Enabling ALS on my notebook change brightness to some specific 
level and disabling ALS will revert brightness back. From userspace 
ALS can be enabled/disabled via this sysfs entry: 
/sys/devices/platform/hp-wmi/als

-- 
Pali Rohár
pali.rohar@gmail.com

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Re: Fwd: Brightness on HP EliteBook 8460p

[joeyli]

於 二，2012-03-20 於 23:03 +0100，Pali Rohár 提到：
> > 
> > Another doubt is the latest statement in _BCM, it emit a BEVT event:
> > 
> > Signal (\_SB.BEVT)
> > 
> > Only HKFR(HotkeyFunctionResponse) method is waiting this event, it
> > should related to how the HP implement brightness function key on
> > Windows through wmi.
> > 
> > Of course this issue really close related to video driver, even
> > more, we might need to know hp wmi for how to implement on Windows.
> > 
> > Unfortunately, sorry for I don't have any solution to you, now, I
> > will continue to trace and find any support from other experts.
> > 
> > 
> > Thanks a lot!
> > Joey Lee
> 
> Hi!
> 
> now I found that ALS button which enable/disable ambient light sensor 
> working with linux and ALS can also decrease/increase brightness.
> 
> ALS can be enabled or disabled via WMI (acpi) on linux too. I found 
> function which enable ALS in linux kernel. See source code of function 
> set_als in hp-wmi.c: http://tomoyo.sourceforge.jp/cgi-
> bin/lxr/source/drivers/platform/x86/hp-wmi.c#L443
> 
> This function can enable ALS which can decrease brightness (but only 
> to specific one level) via WMI. And WMI is ACPI extension, so maybe it 
> is really possible to change brightness via acpi without DRI support.
> 
> But I do not WMI, ACPI and DSDT code. Can you try to decode what is 
> called in acpi when that set_als function in hp-wmi is called? I think 
> here in acpi can be some magic which can manipulate with display 
> brightness. At least ACPI must call somewhat to change brightness...
> 
> Note: Enabling ALS on my notebook change brightness to some specific 
> level and disabling ALS will revert brightness back. From userspace 
> ALS can be enabled/disabled via this sysfs entry: 
> /sys/devices/platform/hp-wmi/als
> 
> -- 
> Pali Rohár
> pali.rohar@gmail.com

Traced the your dsdt from 8460p.

Let's see "set ALS" first, when set ALS enable, BIOS didn't _eat_ any
input value for brightness level:


    Method (WHCM, 2, NotSerialized)
    {
        CreateDWordField (Arg1, 0x00, SNIN)     /* signature */
        CreateDWordField (Arg1, 0x04, COMD)     /* command = write ? 0x2 : 0x1 */
        CreateDWordField (Arg1, 0x08, CMTP)     /* commandtype */
        CreateDWordField (Arg1, 0x0C, DASI)
        Store ("HandleWMICommand Enter", Debug)
...
    If (LEqual (COMD, 0x02))            /* command write */
    {
        Store ("write BIOS command", Debug)
....
        If (LEqual (CMTP, 0x03))        /* write HPWMI_ALS_QUERY 0x3 */
        {
            Store (^WSAL (DDWD), Local2)  /* call ^WSAL and feed DDWD */
            Store (0x00, RTCD)
        }


            Method (WSAL, 1, NotSerialized)     /* write HPWMI_ALS_QUERY 0x3 */
            {
                If (LEqual (PRDT, 0x03)) 
                {
                    Return (Package (0x02)
                    {
                        0x04,
                        0x00
                    })
                }

                \_SB.SSMI (0xEA75, 0x02, 0x03, 0x574D4953, 0x00)   /* emit SMI, BIOS code take job but didn't feed Arg0 to BIOS */
                Return (WFDA ())
            }

Everything handle by BIOS function after emit SMI event, and it didn't
give BIOS any input value of brightness.
So, didn't find any way to change brightness through set ALS.


Then, I found another interesting command for 'write brightness', hp-wmi
doesn't have implementation for this command: 

        If (LEqual (CMTP, 0x06))        /* set brightness? */
        {
            Store ("write Brightness", Debug)
            Store (^SBBC (DDWD), Local2)	/* call DDWD */
            Store (Local2, Debug)
            Store (0x00, RTCD)
        }

            Method (SBBC, 1, NotSerialized)     /* write brighenss? didn't do anything? */
            {
                Return (Package (0x02)		/* just only return a package */
                {
                    0x04,
                    0x00
                })
            }


Unfortunately, the 0x06 command also doesn't do anything for change
brightness on your machine.

Sorry! Didn't find any way can change brightness on your machine unless
we have drm driver support ATI acpi events.


Thanks a lot!
Joey Lee

Re: Fwd: Brightness on HP EliteBook 8460p

[Pali Rohár]

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Hello, I have some good news. Radeon patches from this post
http://lists.freedesktop.org/archives/dri-devel/2012-July/025535.html
export brightness file /sys/class/backlight/radeon_bl/brightness
And finally with these patches I'm able to change brightness on my EliteBook.

-- 
Pali Rohár
pali.rohar@gmail.com

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Re: Fwd: Brightness on HP EliteBook 8460p

[Artur Flinta]

On Sat, Jul 28, 2012 at 4:47 PM, Pali Rohár <pali.rohar@gmail.com> wrote:
> Hello, I have some good news. Radeon patches from this post
> http://lists.freedesktop.org/archives/dri-devel/2012-July/025535.html
> export brightness file /sys/class/backlight/radeon_bl/brightness
> And finally with these patches I'm able to change brightness on my EliteBook.

Wow, it's great news :) I was reading yesterday info about ACPI
patches from AMD on Phronix and thinking will it help or no, and now I
have an answer :)

Regards
Artur



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Re: Fwd: Brightness on HP EliteBook 8460p

[joeyli]

於 一，2012-07-30 於 10:17 +0200，Artur Flinta 提到：
> On Sat, Jul 28, 2012 at 4:47 PM, Pali Rohár <pali.rohar@gmail.com> wrote:
> > Hello, I have some good news. Radeon patches from this post
> > http://lists.freedesktop.org/archives/dri-devel/2012-July/025535.html
> > export brightness file /sys/class/backlight/radeon_bl/brightness
> > And finally with these patches I'm able to change brightness on my EliteBook.
> 
> Wow, it's great news :) I was reading yesterday info about ACPI
> patches from AMD on Phronix and thinking will it help or no, and now I
> have an answer :)
> 
> Regards
> Artur

Yes, thanks for Alex's 3 patches, those patches also works to me on my
machine for backlight control.


Thanks
Joey LEe

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Re: Fwd: Brightness on HP EliteBook 8460p

[Luca Tettamanti]

On Sat, Jul 28, 2012 at 4:47 PM, Pali Rohár <pali.rohar@gmail.com> wrote:
> Hello, I have some good news. Radeon patches from this post
> http://lists.freedesktop.org/archives/dri-devel/2012-July/025535.html
> export brightness file /sys/class/backlight/radeon_bl/brightness
> And finally with these patches I'm able to change brightness on my EliteBook.

Nice, in your older mail I read:

> The PEGP.DGFX acpi device was binding to
> acpi/video driver, the above ASL code emit a 0xD0 bus event to
> video.c but cann't process it. Even we add a new bus event in
> video.c and generate a acpi event, there still need another acpi
> driver should take care it.

That event (0xd0) is probably a custom event announced through ATIF.
I'm working on the code to deal with it, the latest patches are here:

http://lists.freedesktop.org/archives/dri-devel/2012-July/025646.html

You first need this one with the ACPI header:
http://lists.freedesktop.org/archives/dri-devel/2012-July/025517.html

and the other 3 that you've already tested. With my patches on top you
should be able to change the brightness using the hotkeys.

I'd be grateful if you could test them :-)

Luca

Re: Fwd: Brightness on HP EliteBook 8460p

[Luca Tettamanti]

I'm putting back the CC and adding Alex.

On Tue, Jul 31, 2012 at 5:07 PM, Pali Rohár <pali.rohar@gmail.com> wrote:
> Thanks, now working. When I write to acpi video brightness file
> it change brightness and in dmesg is:
>
> [   47.200998] [drm:radeon_atif_handler], event, device_class =
> video, type = 0xd0
> [   47.201102] [drm:radeon_atif_get_sbios_requests], SBIOS
> pending requests: 0x80
> [   47.201104] [drm:radeon_atif_handler], ATIF: 1 pending SBIOS
> requests
> [   47.201105] [drm:radeon_atif_handler], Changing brightness to
> 11

Great! I'll send an updated patch to Alex soon.

> I think that acpi only sent event about brightness key pressed,
> because nothing happened when I pressed it.
>
> Also for windows is needed special HP application (hp hotkey) for
> brightness keys. Without it brightness keys not working too...

I've looked at hp-wmi: the hotkey is indeed dispatched via WMI
(hp-wmi) so you need something in userspace (KDE, Gnome, etc) to
respond to that key press.

> And there is one problem with /sys/class/backlight/radeon_bl.
> When I enable Ambient Light Sensor which auto adjust brightness
> based on sensor data, writing value 0 (min) or 255 (max) to
> /sys/class/backlight/radeon_bl/brightness turn off display.

Ok, that's weird. 0 turns off the panel by design, 255 should not...

> All
> other values (1-254) are OK (adjust brightness level). When I
> turn off Ambient Light Sensor (via hp-wmi kernel module) then
> values 0 and 255 also set brightness level (min and max). My
> suggestion is to convert value 0 to 1 and 255 to 254 to prevent
> this problem.

No idea what's going on here... might be some weird vendor magic.
The WMI code is rather obscure...

Luca
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Re: Fwd: Brightness on HP EliteBook 8460p

[Alex Deucher]

On Tue, Jul 31, 2012 at 11:49 AM, Luca Tettamanti <kronos.it@gmail.com> wrote:
> I'm putting back the CC and adding Alex.
>
> On Tue, Jul 31, 2012 at 5:07 PM, Pali Rohár <pali.rohar@gmail.com> wrote:
>> Thanks, now working. When I write to acpi video brightness file
>> it change brightness and in dmesg is:
>>
>> [   47.200998] [drm:radeon_atif_handler], event, device_class =
>> video, type = 0xd0
>> [   47.201102] [drm:radeon_atif_get_sbios_requests], SBIOS
>> pending requests: 0x80
>> [   47.201104] [drm:radeon_atif_handler], ATIF: 1 pending SBIOS
>> requests
>> [   47.201105] [drm:radeon_atif_handler], Changing brightness to
>> 11
>
> Great! I'll send an updated patch to Alex soon.
>
>> I think that acpi only sent event about brightness key pressed,
>> because nothing happened when I pressed it.
>>
>> Also for windows is needed special HP application (hp hotkey) for
>> brightness keys. Without it brightness keys not working too...
>
> I've looked at hp-wmi: the hotkey is indeed dispatched via WMI
> (hp-wmi) so you need something in userspace (KDE, Gnome, etc) to
> respond to that key press.
>
>> And there is one problem with /sys/class/backlight/radeon_bl.
>> When I enable Ambient Light Sensor which auto adjust brightness
>> based on sensor data, writing value 0 (min) or 255 (max) to
>> /sys/class/backlight/radeon_bl/brightness turn off display.
>
> Ok, that's weird. 0 turns off the panel by design, 255 should not...
>
>> All
>> other values (1-254) are OK (adjust brightness level). When I
>> turn off Ambient Light Sensor (via hp-wmi kernel module) then
>> values 0 and 255 also set brightness level (min and max). My
>> suggestion is to convert value 0 to 1 and 255 to 254 to prevent
>> this problem.
>
> No idea what's going on here... might be some weird vendor magic.
> The WMI code is rather obscure...

FWIW, there is also a bit in the atom firmware info table
(WMI_SUPPORT) to tell whether the system uses WMI or not.  We can
probably use that to limit the max backlight if 255 causes problems
for other WMI systems.  I'm not sure how the interaction with WMI is
supposed to work however.

Alex

Re: Fwd: Brightness on HP EliteBook 8460p

[Pali Rohár]

[-- Attachment #1: Type: text/plain, Size: 2478 bytes --]

On Tuesday 31 July 2012 17:49:32 Luca Tettamanti wrote:
> I'm putting back the CC and adding Alex.
> 
> On Tue, Jul 31, 2012 at 5:07 PM, Pali Rohár 
<pali.rohar@gmail.com> wrote:
> > Thanks, now working. When I write to acpi video brightness
> > file it change brightness and in dmesg is:
> > 
> > [   47.200998] [drm:radeon_atif_handler], event, device_class
> > = video, type = 0xd0
> > [   47.201102] [drm:radeon_atif_get_sbios_requests], SBIOS
> > pending requests: 0x80
> > [   47.201104] [drm:radeon_atif_handler], ATIF: 1 pending
> > SBIOS requests
> > [   47.201105] [drm:radeon_atif_handler], Changing brightness
> > to 11
> 
> Great! I'll send an updated patch to Alex soon.
> 
> > I think that acpi only sent event about brightness key
> > pressed, because nothing happened when I pressed it.
> > 
> > Also for windows is needed special HP application (hp hotkey)
> > for brightness keys. Without it brightness keys not working
> > too...
> I've looked at hp-wmi: the hotkey is indeed dispatched via WMI
> (hp-wmi) so you need something in userspace (KDE, Gnome, etc)
> to respond to that key press.
> 

No, when I rmmod hp-wmi brightness keys still generate events. 
And when I disable acpi then brightness keys do not generate 
events but adjust brightness automatically (by BIOS).

I think that hp-wmi on my notebook only handle bluetooth & wifi 
rfkills and ALS switch. All button working without hp-wmi too.

> > And there is one problem with /sys/class/backlight/radeon_bl.
> > When I enable Ambient Light Sensor which auto adjust
> > brightness based on sensor data, writing value 0 (min) or
> > 255 (max) to /sys/class/backlight/radeon_bl/brightness turn
> > off display.
> Ok, that's weird. 0 turns off the panel by design, 255 should
> not...

But when ALS is disabled 0 did not turn display off.

> > All
> > other values (1-254) are OK (adjust brightness level). When I
> > turn off Ambient Light Sensor (via hp-wmi kernel module) then
> > values 0 and 255 also set brightness level (min and max). My
> > suggestion is to convert value 0 to 1 and 255 to 254 to
> > prevent this problem.
> 
> No idea what's going on here... might be some weird vendor
> magic. The WMI code is rather obscure...
> 
> Luca

ACPI/WMI cannot change brightness, see this what doing that ALS 
function: http://lists.freedesktop.org/archives/dri-devel/2012-
March/020416.html

-- 
Pali Rohár
pali.rohar@gmail.com

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Re: Fwd: Brightness on HP EliteBook 8460p

[Alex Deucher]

On Tue, Jul 31, 2012 at 12:03 PM, Pali Rohár <pali.rohar@gmail.com> wrote:
> On Tuesday 31 July 2012 17:49:32 Luca Tettamanti wrote:
>> I'm putting back the CC and adding Alex.
>>
>> On Tue, Jul 31, 2012 at 5:07 PM, Pali Rohár
> <pali.rohar@gmail.com> wrote:
>> > Thanks, now working. When I write to acpi video brightness
>> > file it change brightness and in dmesg is:
>> >
>> > [   47.200998] [drm:radeon_atif_handler], event, device_class
>> > = video, type = 0xd0
>> > [   47.201102] [drm:radeon_atif_get_sbios_requests], SBIOS
>> > pending requests: 0x80
>> > [   47.201104] [drm:radeon_atif_handler], ATIF: 1 pending
>> > SBIOS requests
>> > [   47.201105] [drm:radeon_atif_handler], Changing brightness
>> > to 11
>>
>> Great! I'll send an updated patch to Alex soon.
>>
>> > I think that acpi only sent event about brightness key
>> > pressed, because nothing happened when I pressed it.
>> >
>> > Also for windows is needed special HP application (hp hotkey)
>> > for brightness keys. Without it brightness keys not working
>> > too...
>> I've looked at hp-wmi: the hotkey is indeed dispatched via WMI
>> (hp-wmi) so you need something in userspace (KDE, Gnome, etc)
>> to respond to that key press.
>>
>
> No, when I rmmod hp-wmi brightness keys still generate events.
> And when I disable acpi then brightness keys do not generate
> events but adjust brightness automatically (by BIOS).
>
> I think that hp-wmi on my notebook only handle bluetooth & wifi
> rfkills and ALS switch. All button working without hp-wmi too.
>
>> > And there is one problem with /sys/class/backlight/radeon_bl.
>> > When I enable Ambient Light Sensor which auto adjust
>> > brightness based on sensor data, writing value 0 (min) or
>> > 255 (max) to /sys/class/backlight/radeon_bl/brightness turn
>> > off display.
>> Ok, that's weird. 0 turns off the panel by design, 255 should
>> not...
>
> But when ALS is disabled 0 did not turn display off.

0 only turns off the backlight, not the panel itself.  Is the
backlight still partially on or is it just the actual panel (timing
and image)?

Alex

Re: Fwd: Brightness on HP EliteBook 8460p

[Pali Rohár]

[-- Attachment #1: Type: text/plain, Size: 2779 bytes --]

On Tuesday 31 July 2012 12:17:05 Alex Deucher wrote:
> On Tue, Jul 31, 2012 at 12:03 PM, Pali Rohár 
<pali.rohar@gmail.com> wrote:
> > On Tuesday 31 July 2012 17:49:32 Luca Tettamanti wrote:
> >> I'm putting back the CC and adding Alex.
> >> 
> >> On Tue, Jul 31, 2012 at 5:07 PM, Pali Rohár
> > 
> > <pali.rohar@gmail.com> wrote:
> >> > Thanks, now working. When I write to acpi video brightness
> >> > file it change brightness and in dmesg is:
> >> > 
> >> > [   47.200998] [drm:radeon_atif_handler], event,
> >> > device_class
> >> > = video, type = 0xd0
> >> > [   47.201102] [drm:radeon_atif_get_sbios_requests], SBIOS
> >> > pending requests: 0x80
> >> > [   47.201104] [drm:radeon_atif_handler], ATIF: 1 pending
> >> > SBIOS requests
> >> > [   47.201105] [drm:radeon_atif_handler], Changing
> >> > brightness
> >> > to 11
> >> 
> >> Great! I'll send an updated patch to Alex soon.
> >> 
> >> > I think that acpi only sent event about brightness key
> >> > pressed, because nothing happened when I pressed it.
> >> > 
> >> > Also for windows is needed special HP application (hp
> >> > hotkey)
> >> > for brightness keys. Without it brightness keys not
> >> > working
> >> > too...
> >> 
> >> I've looked at hp-wmi: the hotkey is indeed dispatched via
> >> WMI
> >> (hp-wmi) so you need something in userspace (KDE, Gnome,
> >> etc)
> >> to respond to that key press.
> > 
> > No, when I rmmod hp-wmi brightness keys still generate
> > events.
> > And when I disable acpi then brightness keys do not generate
> > events but adjust brightness automatically (by BIOS).
> > 
> > I think that hp-wmi on my notebook only handle bluetooth &
> > wifi rfkills and ALS switch. All button working without
> > hp-wmi too.> 
> >> > And there is one problem with
> >> > /sys/class/backlight/radeon_bl.
> >> > When I enable Ambient Light Sensor which auto adjust
> >> > brightness based on sensor data, writing value 0 (min) or
> >> > 255 (max) to /sys/class/backlight/radeon_bl/brightness
> >> > turn
> >> > off display.
> >> 
> >> Ok, that's weird. 0 turns off the panel by design, 255
> >> should
> >> not...
> > 
> > But when ALS is disabled 0 did not turn display off.
> 
> 0 only turns off the backlight, not the panel itself.  Is the
> backlight still partially on or is it just the actual panel
> (timing and image)?
> 
> Alex

I looked at display again and 0 only turn backlight off (or 
adjust minimum value). If I look at display correctly (in dark 
room) I can recognize that display is still on and I can see 
window manager decorations (but text is not readable).

Value 255 when ALS is on has same effect as 0 - adjust minimum 
value (instead maximum).

-- 
Pali Rohár
pali.rohar@gmail.com

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Re: Fwd: Brightness on HP EliteBook 8460p

[Joey Lee]

Hi Artur, 

於 六，2012-02-04 於 20:19 -0700，Joey Lee 提到：
> Add Cc. to dri mail
> 
> Hi Pali, 
> 
> 於 五，2012-02-03 於 16:24 +0100，Pali Rohár 提到：
> > On Friday 20 January 2012 17:55:57 Pali Rohár wrote:
> > > On Friday 20 January 2012 11:28:59 joeyli wrote:
> > > > 於 五，2012-01-20 於 11:12 +0800，joeyli 提到：
> > > > 
> > > > > Hi Pali,
> > > > > 
> > > > > Sorry for I am late reply you.
> > > > > 
> > > > > 於 二，2012-01-17 於 19:10 +0100，Pali Rohár 提到：
> > > > > 
> > > > > > On Wednesday 21 December 2011 12:45:07 Pali Rohár wrote:
> > > > > > > Hello,
> > > > > > > 
> > > > > > > I tried to boot with all 3 strings in acpi_os_name, but nothing was
> > > > > > > changed. I'm attaching dmesg outputs, one from BIOS mode, one from
> > > > > > > UEFI mode. Both are with "Microsoft Windows NT".
> > > > > > 
> > > > > > Did you looked at my logs?
> > > > > 
> > > > > I checked your dmesg log, found the acpi_os_name kernel parameter is :
> > > > > 
> > > > > [    0.000000] Command line: BOOT_IMAGE=/vmlinuz-3.2.0-4-generic
> > > > > root=UUID=4ec6272a-8551-40f3-a1b1-3e10984f3e69 ro pcie_aspm=force
> > > > > acpi.debug_level=0x2 acpi.debug_layer=0xFFFFFFFF "acpi_os_name=Microsoft
> > > > > Windows NT" splash vt.handoff=7
> > > > > 
> > > > > We still need by-pass the os name check in DSDT when test function key,
> > > > > 
> > > > > please help to feed:
> > > > > 	acpi_os_name="Windows 2009"
> > > > > 
> > > > > And,
> > > > > looks like the acpi debug level not enough, please kindly change acpi
> > > > > 
> > > > > debug parameter to:
> > > > > 	acpi.debug_level=0xF acpi.debug_layer=0xFFFFFFFF log_buf_len=5M
> > > > > 
> > > > > summary:
> > > > > 	acpi.debug_level=0xF acpi.debug_layer=0xFFFFFFFF log_buf_len=5M
> > > > > 	acpi_os_name="Windows 2009"
> > > > 
> > > > Forgot remind,
> > > > please remember press brightness function key a couple of times before
> > > > you dump the dmesg and messages log.
> > > > 
> > > > 
> > > > Thanks a lot!
> > > > Joey Lee
> > > 
> > > Hello,
> > > 
> > > there was no acpi log, so I recompiled ubuntu kernel with
> > > CONFIG_ACPI_DEBUG=y and CONFIG_ACPI_DEBUG_FUNC_TRACE. Then I started kernel
> > > with your params.
> > > 
> > > Now I'm attaching very long debug output. I belive it will be now usefull.
> > > 
> > > Pressing brightness keys did not show anything in log.
> > > 
> > > After writing 0 to /sys/class/backlight/acpi_video0/brightness in log
> > > appear: [   57.675070] [ACPI Debug]  Integer 0x000000000000000B
> > > ...
> > > 
> > > And after writing 10:
> > > [   99.865208] [ACPI Debug]  Integer 0x0000000000000048
> > > [   99.865295]   evmisc-0120 [4294967289] ev_queue_notify_reques:
> > > Dispatching Notify on [DGFX] Node ffff880136246c80 Value 0xD0 (**Device
> > > Specific**) [   99.865350]    video-1474 [4294967289] video_bus_notify     
> > > : Unsupported event [0xd0]
> > 
> > Do you need more logs? Or is this enought?
> > 
> 
> Yes, as you point out, this is a doubt for video bus received 0xD0 event
> but nobody take care it.
> 
> Traced dsdt of EliteBook 8460p from you, the _BCM like this:
> 
>     Method (_BCM, 1, Serialized)                /* ATI _BCM, per log, run this _BCM */
>     {  
>         Store (\_SB.BCM (Arg0), Local0)         /* set next level, normally return 0x1 if XP sp2 or later */
>         If (Local0)                             /* if XP sp2 or later */
>         {  
>             Store (BRID, Local1)
>             If (LEqual (SBRV (), 0x00))         /* normally SBRV return 1, will not emit SMI */
>             {  
>                 \_SB.SSMI (0xEA74, 0x04, Local1, 0x00, 0x00)
>             }
> 
>             Signal (\_SB.BEVT)          /* emit BEVT event, HKFR (HotkeyFunctionResponse) waiting it, but why? */
>         }
>     }
> 
> _BCM call SBRV to setup brightness value to variable ABRI:
> 
> Method (SBRV, 0, Serialized)            /* call by ATI _BCM */
> {  
>     Store (\_SB.SBRC (), ABRI)          /* SBRC() return the brightness value, why store to ABRI? only used in PEGP.DGFX.AFN2 */
>     Or (PSBR, 0x80, PSBR)
>     Notify (^, 0xD0)                    /* notify method's parent: PEGP.DGFX by 0xD0 */
>     Return (0x01)                       /* normally return 1 */
> }The PEGP.DGFX acpi device was binding to acpi/video driver, the above
> ASL code emit a 0xD0 bus event to video.c but cann't process it. Even we
> add a new bus event in video.c and generate a acpi event, there still
> need another acpi driver should take care it.
> 
> I thought this acpi event might need take care by radeon drm, but I am
> not good for radeon, need more help.
> 
> Per your acpi debug log, the brightness value was changed normally when
> you access _BCM:
> 
> 83133 Jan 20 17:17:51 Pali-EliteBook kernel: [   57.674669] ACPI: Execute Method [\_SB_.PCI0.PEGP.DGFX.LCD_._BCM] (Node ffff8      801362472a8)		# start test _BCM manually
> 83134 Jan 20 17:17:51 Pali-EliteBook kernel: [   57.674736] exregion-0199 [01] ex_system_memory_space: System-Memory (width 8      ) R/W 0 Address=00000000BF7ACE1C
> 83135 Jan 20 17:17:51 Pali-EliteBook kernel: [   57.674748] exregion-0199 [02] ex_system_memory_space: System-Memory (width 8      ) R/W 1 Address=00000000BF7ACE1C
> ...
> 83179 Jan 20 17:17:51 Pali-EliteBook kernel: [   57.675070] [ACPI Debug]  Integer 0x000000000000000B	# brightness value is 11
> 83180 Jan 20 17:17:51 Pali-EliteBook kernel: [   57.675090]   evmisc-0120 [4294967289] ev_queue_notify_reques: Dispatching No      tify on [DGFX] Node ffff880136246c80 Value 0xD0 (**Device Specific**)
> 83181 Jan 20 17:17:51 Pali-EliteBook kernel: [   57.675099]    video-1474 [4294967288] video_bus_notify      : Unsupported event [0xd0]
> ...
> 83197 Jan 20 17:18:33 Pali-EliteBook kernel: [   99.863593] ACPI: Execute Method [\_SB_.PCI0.PEGP.DGFX.LCD_._BCM] (Node ffff8      801362472a8)
> 83198 Jan 20 17:18:33 Pali-EliteBook kernel: [   99.863817] exregion-0199 [01] ex_system_memory_space: System-Memory (width 8      ) R/W 0 Address=00000000BF7ACE1C
> 83243 Jan 20 17:18:33 Pali-EliteBook kernel: [   99.865208] [ACPI Debug]  Integer 0x0000000000000048	# brightness value is 72 
> 83244 Jan 20 17:18:33 Pali-EliteBook kernel: [   99.865295]   evmisc-0120 [4294967289] ev_queue_notify_reques: Dispatching Notify on [DGFX] Node ffff880136246c80 Value 0xD0 (**Device Specific**)
> 83245 Jan 20 17:18:33 Pali-EliteBook kernel: [   99.865350]    video-1474 [4294967289] video_bus_notify      : Unsupported event [0xd0]
> 
> The brightness values are 11(0x0B) and 72(0x48), that means the BCM
> method return a good value and set to ABRI, ABRI waiting the guy who
> take the 0xD0 event to read then change brightness.
> 
> Another doubt is the latest statement in _BCM, it emit a BEVT event:
> 
> Signal (\_SB.BEVT)
> 
> Only HKFR(HotkeyFunctionResponse) method is waiting this event, it
> should related to how the HP implement brightness function key on
> Windows through wmi.
> 
> Of course this issue really close related to video driver, even more,
> we might need to know hp wmi for how to implement on Windows.
> 
> Unfortunately, sorry for I don't have any solution to you, now, I will
> continue to trace and find any support from other experts.
> 
> 
> Thanks a lot!
> Joey Lee

After traced the acpidump of HP EliteBook 8560w from you, 
I added Cc. to you on this mailing loop because your HP EliteBook 8560w
has the same situation with HP EliteBook 8460p.

Pali Rohár reported the same brightness control issue on 8460p.

The only difference between 8560w with 8460p is HP's ODM put _BCM and
SBRV in SSDT3 table on 8560w.

Please kindly read the above my description. Sorry for I don't have any
solution, now.


Thanks a lot!
Joey Lee

Re: Fwd: Brightness on HP EliteBook 8460p

[Artur Flinta]

Hi Joey!

On Sun, Feb 5, 2012 at 14:51, Joey Lee <jlee@suse.com> wrote:

> Please kindly read the above my description. Sorry for I don't have any
> solution, now.

Thanks for Your support! If anyone is able to write fix for this, I'm
open for testing and sending bug reports :)

Regards
Artur

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