Comment 62 for bug 146859

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.