Originally Posted by AaronP
All of the reports of this problem seem to be with xserver 18.104.22.168, so my guess is that some change in that particular server version broke something. Also, I've seen reports of BackingStore causing crashes due to missing GC validation in the server somewhere. For those that have BackingStore enabled, does disabling it fix the problem? Also, please try the nv or vesa drivers to see if they have a similar problem.
How do I disable it (or, I guess as a first step, how do I find if it's enabled)? What is the effect of en/disabling it?
I can't check with nv, since the latter crashes immediately.
I guess I can try vesa as a test.