I am getting something similar to (3) on xserver-xorg-video-intel in Gutsy with 
the integrated intel 3D chip. The system
-- will NOT respond to mouse clicks
-- will NOT respond to normal keyboard input
-- will NOT respond to Cntl-Alt-Backspace or Cntl-Alt-F1
-- WILL respond to Alt-Sysreq-B (reboot) 

This however does not seem to occur totally at random. It occurs
relatively frequently, but almost always only when I am running IMVU
(http://www.imvu.com/) under wine in OpenGL or DirectX acceleration
mode. I seem to recall it happening previously, but only like once a
month or something, whereas with IMVU running it seems to happen more
than once an hour.

Another symptom I am getting is similar to the above, but the system
does respond to Cntl-Alt-F1, I can then kill wine from a terminal, but
that takes down the X server with it.

As a matter of interest, with you, when (3) occurs does the system
respond to any of Cntl-Alt-Backspace,  Cntl-Alt-F1 or Alt-Sysreq-B?

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[rv280 PCI] random lockups, blank/garbled screen, resolution changes
https://bugs.launchpad.net/bugs/93925
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