This machine is no longer exhibiting this behavior because i turned off
hardware acceleration for X11 with the following /etc/X11/xorg.conf:

Section "Device"
        Identifier "Configured Video Device"
        Driver "intel"
        Option "NoAccel" "true"
EndSection

(i arrived at this thanks to
https://bugs.launchpad.net/ubuntu/jaunty/+source/xserver-xorg-video-
intel/+bug/304871/comments/42 )

as a result, graphics are a bit cruftier on the machine, but it
continues to work at least.

I can't afford to upgrade this machine directly to lucid at the moment.
when i do, i'll remove the xorg.conf and see if i can coax the problem
to recur.

-- 
chvt hangs on ioctl
https://bugs.launchpad.net/bugs/440657
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