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

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Message-ID: <CAEPe-G+MrLWHgugZhvDXrPL8DW+BSsDJ8SrPaT=tbeopUBn6DA@mail.gmail.com>
Date:	Mon, 21 Nov 2011 20:03:55 +0100
From:	Artur Flinta <aflinta@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	alexander.deucher@....com, airlied@...hat.com
Subject: [Bugreport] Screen backllight issues on FirePro M5950 (HP EliteBook 8560w)

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 dim
it.I can write to /sys/class/backlight/acpi_video0/brightness values
from 0 to 20 (as stated in max_brightness), but it have no effect on
the screen, values in brightness as well as in actual_brightness
reflects written number.
Before system boot, I can change brightness of the screen, and it
persist in operating system. Value of the
/sys/class/backlight/acpi_video0/brightness indicates maximum
brightness (20) even if minimal was set before boot. It seems that
built in kernel radeon driver does not correctly handle backlight on
this hardware.

Regards
Artur
-- 
Każdy problem ma swoje rozwiązanie, zatem
jeżeli nie ma rozwiązania to nie ma problemu.
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