I have a similar problem, running Feisty. I don't run compiz/beryl, don't have 
ATI or NVIDIA. I have:
01:00.0 VGA compatible controller: Silicon Integrated Systems [SiS] 661/741/760 
PCI/AGP or 662/761Gx PCIE VGA Display Adapter

I have two user accounts on this computer. When logging out of the other
one, the system freezes (background visible), 100% CPU, and I need the
power button to shut off. This seems to be a fairly serious issue.
Anything I can do to help? Debug info? Just tell me how.

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switching to current logged in user freezes gdm
https://bugs.launchpad.net/bugs/78470
You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is a bug assignee.

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