I've encountered the same failure mode here. The keyboard responds only
to Alt-SysRq-* keystrokes. This is with an up-to-date Karmic, running on
a Dell Optiplex GX260.
Here is the relevant extract from /var/log/syslog, with each line's
datestamp/host prefix elided:
INFO: task i915/0:258 blocked
** Package changed: xorg (Ubuntu) = xserver-xorg-video-intel (Ubuntu)
--
system locks up at random intervals, except mouse
https://bugs.launchpad.net/bugs/469820
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** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New = Confirmed
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system locks up at random intervals, except mouse
https://bugs.launchpad.net/bugs/469820
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** Attachment added: dmesg output
http://launchpadlibrarian.net/34914824/dmesg.txt
** Attachment added: BootDmesg.txt
http://launchpadlibrarian.net/34914825/BootDmesg.txt
** Attachment added: CurrentDmesg.txt
http://launchpadlibrarian.net/34914826/CurrentDmesg.txt
** Attachment added:
