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

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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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