[Bug 41668] Screen locks up at random points when using a 3D compositing wm (gnome-shell) on an rv515 (radeon mobility x1300)

https://bugs.freedesktop.org/show_bug.cgi?id=41668

--- Comment #4 from Michel Dänzer michel@daenzer.net 2011-10-11 02:34:52 PDT ---

`DISPLAY=:0 openbox --replace` results in:

"Invalid MIT-MAGIC-COOKIE-1 keyOpenbox-Message: Failed to open the display from the DISPLAY environment variable."

This is because gdm3 uses a non-default X11 authentication cookie. I use something like

XAUTHORITY=/run/gdm3/$(sudo ls /run/gdm3|grep $(whoami))/database DISPLAY=:0 [...]

to work around it.

running glxgears just shows an empty black box.. all other glx demos are the same empty boxes..

Do they work with the environment variable vblank_mode=0? If yes, does the number for radeon increase in /proc/interrupts once the problem occurs?