My system has been stable for about 3 months then without warning I started to get a freeze of the display and then a problem report saying GPU hung.

I have update the graphics driver as per How to install Intel 82852/855GM driver? so I know that I have the latest driver available but I still keep getting, and reporting, regular GPU hang messages. Now every now and then the screen freezes in a big way and I can only proceed by ssh in from a separate machine and killing off lightdm and then restarting it and logging in again.

If anyone has fixed this problem it would be good to know the solution.


I have a temp fix for this issue. It was getting so bad that the system was almost of no use with a failure every few minutes and complete hang every hour or so.

Looking in /var/log/Xorg.0.log I found that the existing driver was using UXA:

[ 12.905] (II) UXA(0): Driver registered support for the following operations:
[ 12.905] (II) solid
[ 12.905] (II) copy
[ 12.905] (II) composite (RENDER acceleration)
[ 12.905] (II) put_image
[ 12.905] (II) get_image

The temp fix is to switch this off and enable SNA Acceleration by creating /usr/share/X11/xorg.conf.d/20-intel-conf as described in How can I enable the SNA acceleration method for Intel cards, under Ubuntu 12.04 - 12.10?

Note also there is an open bug for this issue https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1140716

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