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[abssorb <abssorb@xxxxxxxxx>]

I also get this problem.  ATI HD 4670on 64 bit.  User switching results
in blank screen, and Ctrl+Alt+f1 / f2 etc doesn;t work.  Neither does
Alt+ SysRq+(anything). Machine is completely dead needing a power off.

This also happens when switching display - Ctrl+Alt+f1 is OK, but
switching back to to GUI with Ctrl+Alt+f7 results in the same locked-up
machine.

-- 
black screen when switching between multiple X session
https://bugs.launchpad.net/bugs/529882
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