Re: Fwd: Brightness on HP EliteBook 8460p

[joeyli <jlee@suse.com>]

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