[ubuntu] Unity failure upon resuming from hibernate, 12.04

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http://ubuntuforums.org – Running 64-bit Ubuntu on my Dell Inspiron 1545. Actually 12.04 had initially solved all my multi-monitor problems... everything was working wonderfully until some time in the last couple weeks. But now, since some update or other, I have the following problem: If I have an external monitor plugged in, close the laptop lid, and move the mouse, I find myself using only the external display -- which is what I want. But if I then tell the laptop to hibernate, when I tell the laptop to resume nothing good happens. Usually it is just a blank screen. I can use Ctrl-Alt-F1 to switch to a virtual ter (Hardware)