@Smurphy
If you have a laptop maybe it is just a Pipe A problem for you.
The fix for this issue is to quirk your card to force enabling Pipe A. Try 
setting this option in your xorg.conf, then restart X and wait five minutes or 
how long it takes to suspend your screen:

  Section "Device"
    ...
    Option "ForceEnablePipeA" "true"
  EndSection

-- 
lockup on mac mini 945GM [8086:27a2]
https://bugs.launchpad.net/bugs/218334
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