Matthew,
Can you attach the following files:
uname -a > uname-a.log
cat /proc/version_signature > version.log
sudo lspci -vvnn > lspci-vvnn.log

Also, please attach a complete dmesg log which includes the error point (ie. 
the point at which your PC display sleeps & then lock-up occurs).
Thanks.

** Changed in: ubuntu
       Status: New => Incomplete

** Summary changed:

- When display goes to sleep, it won't wake up again
+ [Gutsy regression] When display goes to sleep, it won't wake up again

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[Gutsy regression] When display goes to sleep, it won't wake up again
https://bugs.launchpad.net/bugs/151513
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