Removing compiz did not solve the problem for me.  As a workaround,
disabling DRI in xorg.conf seems to allow a user to log in normally.
Compiz will not work in this case and rendering is noticeably slower.
My graphics card is:

Intel Corporation 82845G/GL[Brookdale-G]/GE Chipset Integrated Graphics
Device (rev 03)

I believe this has been traced to a bug in the xorg intel driver and
needs to be fixed upstream.

-- 
[gutsy, hardy, intrepid] Blank screen and (EE) intel(0): overrun on pipe B! on 
i945GM using intel driver
https://bugs.launchpad.net/bugs/221119
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