Samsung R510 LCD baclkight

dshdsh · #1 9th November 2010, 01:29 PM

Hello!

I've installed Fedora 14 on my notebook Samsubg R510 and found that I can't change LCD backlight using Fn+Up/Down. xbacklight doesn't work too. Fortunately

Code:

setpci -s 00:02.0 F4.B=hex_value

works. In /var/log/dmesg I see

Code:

[    0.121535] [Firmware Bug]: ACPI: ACPI brightness control misses _BQC function

I tried to upgrade BIOS but it didn't help. I see same behavior with newest available BIOS.

hellork · #2 9th November 2010, 09:02 PM

This is a BIOS bug, but if I read correctly a workaround will be employed in a later kernel.
http://www.mail-archive.com/acpi-bug.../msg31106.html

DukeNukem · #3 20th November 2010, 03:04 PM

I own the same laptop, here is a quick how to I wrote.

http://fedora.yolasite.com/faq-samsung-r510.php

Its not 100% newbie friendly, so if you need further help post here and I will assist.