I'am using the gutsy release and I have find a workaround for this bugs.
xgl-xserver in not involved, it was gnome-screensaver the accountable.
In fact, the XGL in on the display :1.0, and gnome-screensaver in on the
display :0.0.
So when you call gnome-screensaver-preferences, he is called from :1.0, it
cause the segfault.
If you run:
#:-$> DISPLAY=:0.0 gnome-screensaver-preferences
the window appear but with no border. The good way it to use gnome-
screensaver-preferences with the sync option:
#:-$> gnome-screensaver-preferences --sync
A note for the Gutsy:
In the latest gutsy upgrade 's, the solution found for solve this is to run
gnome-screensaver daemon on the current display, so :1.0 (I'am using XGL on an
ATI X14OO video card whith the fglrx driver). the gnome-screensaver-preferences
running fine, because the panel and the daemon are on the same display :1.0.
The old solution to run gnome-screensaver on display :0.0 is better for
performance and CPU consumption, because running opengl program on XGL is not a
good idea (with fglrx driver). I have modifier the launcher for
gnome-screensaver-preferences by adding the --sync option and gnome-screensaver
with --disply=:0.0.
--
screensaver make crash GDM
https://bugs.launchpad.net/bugs/35501
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