I tried disabled extmod in my xorg.conf, but with or without it, if I
login (with compiz enabled) and switch to a text console and back, then
I'm stuck on a blank screen and need a remote gdm restart doing.

In any case I find that a remote kill of the compiz.real process will
unlock the vt lock and recover things pretty much (apart from
compiz.real being dead stops doing its work)

username     11919 11894  3 21:24 ?        00:00:01 /usr/bin/compiz.real
--ignore-desktop-hints --replace ccp

kill -9 11919
in my case recovered it.

So the bug is in compiz.real, maybe?

I did an strace on compiz as I switched to a text console and back again


** Attachment added: "strace of compiz.real while stuck in black screen in 
change back from text console"
   http://launchpadlibrarian.net/9248605/compiz.trace

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Switch User freezes at blank screen
https://bugs.launchpad.net/bugs/112518
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