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[asala <992344@xxxxxxxxxxxxxxxxxx>]

In my case, not even ctrl-alt-F1 was able to bring up a console. --using nvidia driver 295.40, 2 displays in twinview--.
Crash was catastrophic, and the only remaining option was Alt-SysRq+REISUB.
However, I executed compiz settings manager and unchecked both "hide panels/docks in expo" and "Mipmaps" and that seemed to solve the issue. Later activation of Hide panels/docks didn't hang the system so I guess it's the "Mipmaps" thing the responsible of the crash.

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https://bugs.launchpad.net/bugs/992344

Title:
  Graphical corruption and hangs when using Expo workspace switcher

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