Comment 3 for bug 1197102

The logs did not capture the error, do you mind tracking down one with a stack trace? Search /var/log/Xorg*

Can you give the xrandr commands you use, for it looks like you have just resized the panning area rather than change the resolution on the display? I am not sure that is what you want. Perhaps an Xorg.log/xrandr from raring might help explain what you want.

Signal 6 is SIGBUS, indicative of a GPU hang. That it results in a crash is fixed in current kernels, but the root cause is that something hung your gpu. There should be a /sys/kernel/debug/dri/0/i915_error_state containing the debug details.