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

[Michel Dänzer]

On Tue, 2010-01-19 at 13:23 +0100, Bruno Kleinert wrote: 
> Am Freitag, den 15.01.2010, 17:32 +0100 schrieb Bruno Kleinert:
> > Maybe there's something in the logs on my amd64/Radeon system. I'll look
> > at these files tomorrow.
> I had some annoying trouble to suspend the machine. To make things
> short: For the whole weekend I only got two cycles of suspend -> resume,
> as the box locks up when the system is snapshotted...
> 
> But I found out something interesting: I'm using GNOME as desktop
> environment, so I'm also using gnome-screensaver. Quite funny: If I make
> GNOME *not* start the gnome-screensaver, then, of course, the screen
> doesn't get locked by the gnome-screensaver when the machine is
> suspended and resumed. But then I get *no* black screen after the
> resume, and also switching to a text console shows up text!
> 
> 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.


-- 
Earthling Michel Dänzer           |                http://www.vmware.com
Libre software enthusiast         |          Debian, X and DRI developer