Bug#574169: xserver-xorg-video-radeon: dims display after some days of uptime

[Alex Deucher]

On Wed, Mar 24, 2010 at 8:36 AM, Piotr Engelking <inkerman42 at gmail.com> wrote:
> I can reproduce this bug with xserver-xorg-video-radeon 1:6.12.192-1,
> KMS-enabled upstream stable kernel 2.6.33.1, and xscreensaver 5.10-7
> by running 'xscreensaver-command -lock' in X and switching to another
> console before the screen finishes fading. (This requires the
> xscreensaver 'fade' option to be enabled, which is on by default.)
> After unlocking X, the screen is considerably dimmer. Running xgamma
> results in the following output:
>
> $ xgamma
> -> Red  1.000, Green  1.000, Blue  1.000
> $
>
> Running 'xgamma -gamma 1' _does_ however result the screen to normal brightness.
>
> This bug may very well not be radeon-related, but I am not able to
> test it on another hardware at the moment - please do. (Cc-ing
> xscreensaver maintainers.)

The fade effect done by adjusting the gamma (driver independent).  The
gamma isn't changed when you switch VTs.

Alex