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It's not all that uncommon for the display to lock up or just get weird on Linux Mint 13 with Cinnamon and 3 displays.

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I'll do the following:

  1. Hit Alt-F2, then type 'r' and hit Enter. Sometimes that fixes the problem.

  2. Otherwise, Cinnamon will restart if you kill it (like the Mac Finder).

    • hit Ctrl-Alt-F1, and login to a terminal. Then run this command:
      killall -9 cinnamon
    • hit Ctrl-Alt-F8, to get back to X
    • if you have multiple displays, you'll find windows stretching across displays. Do step #1 of Alt-F2 'r', and that problem should be fixed.

I found that running cinnamon --replace does not seem to work well.

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