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]

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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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