This bug, or one very similar, also affects me.
The freeze only occurs when using dash.
The mouse pointer still moves but nothing responds and the rest of the
screen including clock, pannel, dash, all programs, etc are frozen.
HOWEVER, Ctr+Alt+F1-7 still work to open other tty's.
The quick workaround that works for me is to kill compiz like so.
1) Press Ctrl+Alt+F3
2) Log in to a terminal
3) type ps -A | grep compiz
and make note of the process id (pid)
4) type kill (pid)
replacing (pid) with the process id of compiz for your session eg. kill
1274
5) Press Ctrl+Alt+F7
You should be returned to your desktop which will be missing a panel,
dash, etc. These will automatically reload in a few moments.
P.S. The following command could be substituted for steps 2 and 3. I have made
it into a bash script called killcompiz
sudo kill $(ps -A | grep compiz | awk '{ print $1 }')
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https://bugs.launchpad.net/bugs/999645
Title:
Freeze with unity 3d (12.04)
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