[arch-general] Display issues with Linux 3.1

Taylor Hedberg tmhedberg at gmail.com
Fri Nov 11 10:36:02 EST 2011

Sebastian Schwarz, Fri 2011-11-11 @ 16:26:24+0100:
> After running `xbacklight -set 100` my backlight is at the
> previous brightness level, which is 57% and not at the 100%
> xbacklight should set it to.

I see. I usually run my backlight at 100%, so I could be seeing the same
thing and not realizing it, as my previous level would be 100% in the
usual case.

> So 3.1 has probably some new backlight code, which does not
> work as it should.  And indeed there are two threads on the
> linux.kernel newsgroup[1, 2] and one on the LKML[3] with an
> explanation, a patch[4] and a couple of bug reports[5, 6, 7].
> I have not tested the patch yet, but is seems to deal with the
> issue at hand.
> [1]: https://groups.google.com/group/linux.kernel/browse_thread/thread/28296924e8888e31
> [2]: https://groups.google.com/group/linux.kernel/browse_thread/thread/fde3079d9ff7b77c
> [3]: https://lkml.org/lkml/2011/9/19/381
> [4]: https://lkml.org/lkml/diff/2011/10/25/473/1
> [5]: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/872652
> [6]: https://launchpad.net/~kamalmostafa/+archive/stuck-backlight
> [7]: https://bugs.freedesktop.org/show_bug.cgi?id=41926

Thanks for these links. I'll test the patch on my system tonight when I
get some free time. Compiling Linux on my laptop takes forever.

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