This is in essence a bug in the graphics driver. In fact I had the same
problem earlier, but it was fixed with a compiz workaround. See bug
269509 for details.
Can you please do "glxinfo > /tmp/primary.txt" in your normal working
session, then start a guest session, let it settle for a minute or two,
and then type blindly:
* Alt-F2
* glxinfo > /tmp/guest.txt
* Enter
* Control-Alt-Backspace to kill the guest session
Then please attach /tmp/primary.txt and /tmp/guest.txt here.
** Changed in: compiz (Ubuntu)
Assignee: Martin Pitt (pitti) => (unassigned)
Status: Triaged => Incomplete
Target: ubuntu-8.10 => None
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Guest session and any other session can't be started if compiz is enabled
https://bugs.launchpad.net/bugs/276222
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