Comment 11 for bug 583891

I'm not entirely convinced either. But I find it suspicious that various processes are crashing with the same kernel error message, coming from the same DRM driver in the kernel. Whichever process gets the error is the one that crashes, so when it's compiz, you have windows but no window manager; when it's X, the whole window system dies.

The fact that a variety of programs are crashing -- all talking to one driver -- leads me to suspect that the bug is in the driver, not in the programs. But only time and further investigation will tell.