Red Hat Bugzilla – Bug 695034
GPU hangs, reboot required i915_hangcheck_elapsed errors
Last modified: 2012-08-16 09:48:39 EDT
Description of problem:
A user was playing Neverball (from Fedora games) when the system froze. I was able to get to a tty login and kill the process. However, we then got hundreds error messages. Getting back to GUI we found it was unusable. (Still frozen)
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. play Neverball Hard, "Pipe"
3. go to TTY (ctl-alt-F2) and log in, kill process
Hundreds messages on screen, similar to this with n represent numbers:
[nnn.nnnnnn] [drm:i915_do_wait_request] *ERROR* i915_do_wait_request returns -5 (awaiting nnnnn at nnnnn)
[nnn.nnnnnn] [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
Switch back to GUI is possible but no work can be done -- it is still frozen.
From the TTY, I was able to log in as root and do a shutdown -r to reboot the system.
No GPU hang. If process has to be killed, system returns to normal after it.
I am also receiving the "[drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed" message in /var/log/messages on Fedora 15.
Every time this happens, I'm experiencing a significant (sometimes up to 2 seconds) lag performing Gnome Shell actions like changing workspaces or entering/exiting the overlay.
There is a patch to fix this available on the linux-kernel mailing list:
Please provide a kernel update with this fix ASAP. This bug is making Gnome 3 nearly unusable on Sandy Bridge hardware.
I've tested the patch in comment #1 as part of 22.214.171.124-34 (not pushed to bodhi yet):
It fixes the easily reproducible issue for me.
I have also been testing kernel-126.96.36.199-34.fc15 successfully.
Dave, it seems the patches you added to the koji build referenced in comment #2 solved the issues for people on F15. Are those (or just the patch in comment #1) safe to bring back to F14, which is 2.6.35 based?
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