Please try the drm-intel-next mainline kernel here [1]. Download and
install the _all headers, i386 headers, and i386 image.

Then boot into that kernel with 'drm.debug=0x02' in the grub kernel line
after 'quiet splash'.

Then see if you can reproduce a crash where you can switch to a TTY with 
Ctrl+Alt+F1. Login and then take a copy of these three files:
cat /sys/kernel/debug/dri/0/i915_error_state > i915_error_state.txt
cat /var/log/Xorg.0.log > Xorg.0.log.txt
dmesg > dmesg.txt
Then try restarting X by running 'startx'.

If you can't switch to a TTY no matter how many times you reproduce,
upload your kern.log file after you recover, noting the exact date/time
the crash occurred.

[1]: http://kernel.ubuntu.com/~kernel-ppa/mainline/drm-intel-
next/current/

-- 
X crashes minutes after resuming from suspend to RAM
https://bugs.launchpad.net/bugs/583902
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