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[Barney Livingston <ubuntu@xxxxxxxxxxxxxx>]

I too am seeing the very same symptoms, it's happened several times.
Machine is a Thinkpad T60 with Radeon Mobility X1400. I have KMS turned
off with a kernel option because it was causing a lot of problems.

Xorg.0.log contained "[mi] EQ overflowing. The server is probably stuck
in an infinite loop." and a stack trace implicating radeon_drv.so and
libglx.so. Next time it happens I'll make sure to keep a copy of the
stack trace.

Also syslog contains:
May 30 20:36:30 jarvis kernel: [60546.074216] Uhhuh. NMI received for unknown reason b0 on CPU 0.
May 30 20:36:30 jarvis kernel: [60546.074222] You have some hardware problem, likely on the PCI bus.
May 30 20:36:30 jarvis kernel: [60546.074225] Dazed and confused, but trying to continue

Seems to happen after a day or so of use, possibly always after a
suspend/resume. Suddenly the pointer goes slow and no input works, not
even the likes of ctrl-alt-delete nor ctrl-alt-f1. Since GLX is
implicated I'm trying turning off compositing to see if it happens
again.

-- 
[Radeon] [Lucid] [mi] EQ overflowing. The server is probably stuck in an infinite loop
https://bugs.launchpad.net/bugs/567696
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