I have been trying to get reproduce the bug to capture dmesg,
i915_error_state and even dtraces from my gdm session, but I am not sure
what triggers it yet.

So far, it seems that it freezes when the screensaver is about to run,
when idle for some time.

I had since disengaged the screensaver, and the energy control option to
never turn my screen off again, so far it has not frozen or logged out
my system again. I suspect that this could be the root cause, but I am
not sure how to prove it, or what packages could be involved to further
the investigation.

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https://bugs.launchpad.net/bugs/771837

Title:
  xorg died (gracefully to login) but without ado

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