In my case, with a fully updated ubuntu 12.04 as of today, it happened to me
twice... and many windows were actually just a couple of Nautilus, one
Firefox, one Thunderbird... clicking on the top unity icon (trying to open a
new application) froze everything once the dash was displayed, with four
windows.
Dual display 1360x768 plus 1280 x 800... (1360x1568), seems that something gets
out of memory...
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS,
943/940GML Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS/GME, 943/940GML
Express Integrated Graphics Controller (rev 03)
This is a production machine, nothing bleeding edge installed.
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https://bugs.launchpad.net/bugs/977804
Title:
Unity crashes when many windows are opened (intel_do_flush_locked
failed: No space left on device)
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