Bug#719785: [xserver-xorg-video-nouveau] Brightness not changeable after suspend/hibernate on HP 8530w

[Sven Joachim <svenjoac@gmx.de>]

On 2013-08-15 12:30 +0200, Marek Straka wrote:

> Upon suspend or hibernation the brigtness is set on minimum and can
> not be changed. Values in
> /sys/class/backlight/acpi_video0/max_brightness can be changed with Fn
> key, but it has no reaction to background illumination.

This is a kernel problem.  Did it work with older kernels, e.g. the one
in Wheezy?

> Exactly same problem is described also here (supposedly solved): https://bugzilla.redhat.com/show_bug.cgi?id=726651

And https://bugs.freedesktop.org/show_bug.cgi?id=39550 is an upstream
bug report on the issue.  You may want to follow up there.

Cheers,
       Sven