> this is a hard freeze :-(

 usually what happens is the X server exits, leaving the video hardware
displaying whatever it was at the time.  So the mouse doesn't move the
cursor, and you can't ctrl+alt+f1 (because no X server is listening for
that key combo.)  However, it's only X that's affected.  If you have
another computer you can ssh in from, you can shut down cleanly.  Or
Alt+sysrq+r to take the keyboard out of "raw" mode, so e.g.
ctrl+alt+delete should shut down cleanly.  or hold alt+sysrq and hit s,
then u, then b.  (to sync, umount, and reboot.)  The power button should
also shut down cleanly.

 When X crashes like this, restarting it is no good.  The video hardware
is in some weird state and only re-POSTing will help, which only happens
on a reboot or when coming back from a suspend/resume.

-- 
drm lockups on g965 hardware
https://bugs.launchpad.net/bugs/104673
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