Messages in this thread | | | From | "Deucher, Alexander" <> | Subject | RE: [Bugreport] Screen backllight issues on FirePro M5950 (HP EliteBook 8560w) | Date | Mon, 21 Nov 2011 19:45:35 +0000 |
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> -----Original Message----- > From: Artur Flinta [mailto:aflinta@gmail.com] > Sent: Monday, November 21, 2011 2:04 PM > To: linux-kernel@vger.kernel.org > Cc: Deucher, Alexander; airlied@redhat.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.
The driver doesn't handle the backlight at all. We leave it up to ACPI.
Alex
> > Regards > Artur > -- > Każdy problem ma swoje rozwiązanie, zatem jeżeli nie ma rozwiązania to nie > ma problemu.
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