I think the key here is the 3D stuff (OpenGL). In my case, what I noticed as the culprit was the screensaver. Once I disabled it, even with power management enabled, putting the monitor to sleep and despite the fact I use a KVM that most of the time is not selected to the Ubuntu machine, I haven't get any X crashes.
I think the key here is the 3D stuff (OpenGL). In my case, what I noticed as the culprit was the screensaver. Once I disabled it, even with power management enabled, putting the monitor to sleep and despite the fact I use a KVM that most of the time is not selected to the Ubuntu machine, I haven't get any X crashes.