Bug#565344: [xserver-xorg-video-radeon] Black screen after resume from suspend to disk/RAM

[Bruno Kleinert]

Am Dienstag, den 19.01.2010, 13:46 +0100 schrieb Michel Dänzer:
> On Tue, 2010-01-19 at 13:23 +0100, Bruno Kleinert wrote: 
> > Maybe it's some crazy bullshit, but I have a guess where this could come
> > from: ;) gnome-screensaver fades the display to black when it gets
> > active, maybe this is done by manipulating color/contrast/whatever
> > settings (?). I guess so, because the text "snapshotting the system" at
> > the text console is often very dark and sometimes invisiable after
> > gnome-screensaver got active to lock the screen before the machine
> > starts the suspend procedure.
> > Now, if the machine gets resumed, maybe these color/contrast/whatever
> > settings don't get successfully restored or restored at all.
> 
> If that is the case, running something like
> 
> DISPLAY=:0 xgamma -gamma 1.0
> 
> from an ssh login might restore the display.
Great, that helps! After calling this command also the text console
becomes visible again, when I switch to a text VT.

Before I executed xgamma -gamma 1.0 I queried the X server by calling
xgamma about the current settings and the output of xgamma was, that the
values for RGB were already all set to 1.0! So it looks as if the state
of the X server and the graphics hardware aren't the same after
resuming.

Is there a possibility to query the graphics hardware about gamma
settings directly?
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