I am not sure if I have the same problem but the result looks similar. 
I just reinstalled lucid on my z61m with an ati x1400 build in. 

After a couple of hours the screen gets blank and I have to do a hard
reset. This happened to me now two times while I was surfing.

-- 
black screen after a few user switches
https://bugs.launchpad.net/bugs/546578
You received this bug notification because you are a member of Ubuntu-X,
which is the registrant for xserver-xorg-driver-ati.

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