My symptoms seem to have similar causes, but I'm not sure if this is the
same bug.
I upgraded to the Jaunty RC on April 17, and had decent luck running DRI
and UXA on a dual-screen Virtual 2944x1200.
X did crash every couple of hours, but while it ran, the performance was
great, glxgears 1100+fps, smooth alt+tab switching, great cube
switching.
On April 18, I upgraded to the mesa 7.4-0ubuntu3 packages (glx, libglu,
dri, etc..), and compiz would not start. It complained about the
MAX_TEXTURE_SIZE of 2048 and fell back to metacity.
When I downgraded to the mesa 7.4-0ubuntu2 packages, compiz worked fine.
I did this upgrade/downgrade a few times to make sure.
So I just did bamed's TEXTURE_LIMIT=4096 hack above, but "glxinfo -l" also
reports a
GL_MAX_CUBE_MAP_TEXTURE_SIZE_ARB = 2048
which is what I assume is limiting how my right-hand screen handles redraws and
the desktop cube.
--
No dri (and therefore no compiz) for virtual screen greater than 2048x2048
https://bugs.launchpad.net/bugs/146859
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