Question :
The following page features a workaround (successful on my system):
http://askubuntu.com/questions/292471/ubuntu-13-04-screen-freezing
It consists in adding a user to the the video group
sudo adduser $USER video
I really don't understand why this affects the kernel, but I experienced
no freeze for more than a week on both 12.04 and 12.10 ubuntu. It used
to freeze at least twice a day prior to that modification.
PS : I also use the kernel parameter (noapic).
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https://bugs.launchpad.net/bugs/908335
Title:
Kernel Hard Freezing Very Often
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