Seeing the same - but later: if I run xrandr when logged in. I have a
dualhead set up on my laptop, the computer that this is about, but I
don't want to hardcode it into xorg.conf because then it will complain
if I'm not near the separate monitor. So I run a few xrandr commands
after login and presto, it works. Most of the time. It seems that if I
run two xrandr commands in quick succession while the machine is busy,
it often locks up (in the same sense as the others have described
above); same if I ask KDE to tamper with the resolution. If I wait after
login till the system has "settled down", I can run the xrandr command
that sets things up without problem.

Attaching trimmed /var/log/Xorg.0.log.old, this is when it locked up
badly. Will also attach /var/log/Xorg.0.log, my currently running
session where everything works blissfully.

** Attachment added: "Trimmed from around 1M to 5200 lines"
   http://launchpadlibrarian.net/21182294/Xorg.0.log.old.trimmed

-- 
kdm crashes when randr is enabled
https://bugs.launchpad.net/bugs/147361
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