Okay, I pulled the following packages from the PPA:

libdrm2 (2.4.1-0ubuntu7~intrepid)
libdrm-intel1 (2.4.1-0ubuntu7~intrepid)
xserver-xorg-video-intel (2:2.5.1-1ubuntu5~intrepid)

Bug is CONFIRMED in these newer packages. Console unresponsiveness is
still observed, although I'm not seeing the X server peg the CPU as
before.

I didn't investigate the failure modes as thoroughly this time, but I
did find one helpful little tidbit: glxgears, running in a window,
triggers the problem. As before, it runs fine in the first X11 session,
but in a second session, the window comes up black and the console goes
bye-bye (for about a minute, until the screen blanks and the Ubuntu
error dialog appears). The Xorg.0.log file produced from this is
interesting, and is attached above.

** Attachment added: "X server log file, running glxgears in a window"
   http://launchpadlibrarian.net/20622875/Xorg.0.log.glxgears.txt

-- 
Blank screen, unresponsive console when starting full-screen OpenGL apps
https://bugs.launchpad.net/bugs/309784
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