Good idea. I'm going to paste the two descriptions from 1027619 here
too:

OP:

I am running xubuntu 12.04 on a Thinkpad X301. Since I first installed
12.04 a few months ago, everything worked fine for a couple of months.
But a few weeks ago (i.e. early July 2012), I started getting xorg
crashes.

The crashes happen when the computer is attempting to sleep (suspend,
not hibernate), either because I closed the lid or because I left it on
long enough for sleep to kick in automatically. It happens about 1 time
in 5 that sleep is attempted. I get returned to the login screen. Sleep
does not complete. The flashing moon light continues to blink. I can log
in again and continue, but nothing works properly... no wireless, docky
will not launch, everything is very slow, etc.

These frequent crashes make xubuntu 12.04 completely unusable. I hope
that a solution can be found soon.

Follow-up from joeaguy:

I have a ThinkPad t420s and have the same issue.

I can suspend to ram successfully several times, but under normal usage,
after the 3rd or 4th time Xorg crashes and I am sent back to the login
screen. The moon icon flashes and then stops. Once on the login screen,
logging in does not work, control-alt-F1 (etc) do not get me to a login
terminal. If I select shutdown, the computer goes to sleep during
shutdown, and I have to wake it order to finish shutdown. The computer
is generally not usable until I reboot.

I have tried booting and then putting my computer to sleep and waking it
up repeatedly, running different programs in between each cycle, to try
and find some trigger that reproduces the problem. I could not reproduce
the problem this way. The crash has only happened for me after
continuous normal usage. I have not been able to artificially create the
conditions for the crash.

Let me know if there are any logs or other data I can provide to help
diagnose.

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https://bugs.launchpad.net/bugs/1026777

Title:
  Xorg segfault: kicks out to login screen

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