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[all variants] System freeze every few days

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linux-howto

http://ubuntuforums.org – I have ubuntu running on a thinkpad t400 with intel 4000hd graphics chip. It's a long story so let me start with what happened first, before while running any window/desktop every few days the dri aspect would segfault, so I would be left with windowless desktops. So I update the intel drivers to the latest ppa version. Now I have different problems, every few days I would get what looks like a hard system lock. The screen would just lockup, cannot ctl-alt-f to anything. The first few times I thought it was a complete system lock for which I would have to do a hard shutdown by holding the p (Hardware)