Just some further confirmation of this issue. On a Sandy Bridge i5 Dell Latitude e6420 laptop with Intel HD 4000 integrated graphics. On 3.5.0-26-generic I experienced GPU hangs once or twice an hour (fixed themselves after a few seconds) and full lockups 2 to 5 times per day, depending on what I was doing (have to hard reboot the machine to recover). Having firefox open seemed to be a risk factor, and if FF had loaded flashplayer, I expected a full lockup at any moment.
As described in the following bug, which is a similar issue... https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video- intel/+bug/1041790 ... I added the following to my /etc/default/grub options: i915.semaphores=0 This decreased the frequency and severity of lockups/crashes, but they were still there. Upon further investigation, I found this bug to be the actual issue (my syslog showing the same 3 lines as the others in this thread), and have reverted to 3.5.0-25-generic and have been running without any issues for a day or two now. I still have i915-semaphores=0 in my grub boot options but don't think I still need that... -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1041790 Title: [snb] GPU lockup IPEHR: 0x0b160001 IPEHR: 0x0b140001, workaround i915.semaphores=0 To manage notifications about this bug go to: https://bugs.launchpad.net/xserver-xorg-video-intel/+bug/1041790/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
