Re: Fwd: [Bugreport] Screen backllight issues on FirePro M5950 (HP EliteBook 8560w)

[joeyli <jlee@xxxxxxxx>]

Hi Artur, 

於 五，2011-12-09 於 22:41 +0800，Li Joey 提到：
> 
> 
> ---------- Forwarded message ----------
> From: Artur Flinta <aflinta@xxxxxxxxx>
> Date: 2011/11/24
> Subject: [Bugreport] Screen backllight issues on FirePro M5950 (HP
> EliteBook 8560w)
> To: linux-acpi@xxxxxxxxxxxxxxx
> 
> 
> Hi!
> I have HP Elitebook 8560w with FirePro M5950, Fedora 16, kernel
> 3.1.1,xorg ati driver 6.14.3 and issues with screen backlight - can't
> dimit.I can write to /sys/class/backlight/acpi_video0/brightness
> valuesfrom 0 to 20 (as stated in max_brightness), but it have no
> effect onthe screen, values in brightness as well as in
> actual_brightnessreflects written number.Before system boot, I can
> change brightness of the screen, and itpersist in operating system.
> Value of the/sys/class/backlight/acpi_video0/brightness indicates
> maximumbrightness (20) even if minimal was set before boot. Kernel
> radeon driver maintainers said, that backlight is driven by APCI
> drivers, so I'm here to ask for help :)
> How can I help to debug this issue? I'm able to recompile kernel and
> apply patches, as well as do some tests. Unfortunately I'm unable to
> write or correct driver code.
> RegardsArtur
> --
> Każdy problem ma swoje rozwiązanie, zatem
> jeżeli nie ma rozwiązania to nie ma problemu.
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> 

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 


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