[Bug 507504] Re: display freezes, [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung

[Warren E. Downs]

I've been having this same kind of hang ever since Kubuntu 9.04.  Back
then I used the 2.4 version of X to avoid the problem (and I can still
do that).  It meant I could not have accelerated graphics but that
wasn't much of an issue for me.  But since 9.10 it also means I cannot
suspend and resume (either to ram or disk), which I really need to work
to be productive.

So, I've been trying every tip I can find to work around this problem.
I'm attaching the logs from the latest hang.  Since upgrading to the
2.6.33 kernel at least I can VT switch to the console instead of having
to SSH in.  And I can even start a new X application (like xterm) which
I could never do before.  But existing X windows are all gone into
never-never land, as is the window manager (though the processes are
still there of course).

I'll be trying the various xorg.conf options mentioned here to narrow the subsystem it is in:
https://wiki.ubuntu.com/X/Troubleshooting/Freeze#How%20to%20Get%20a%20Batchbuffer%20Dump%20%28-intel%20only%29

(The batch buffer dump won't be useful on my version but I have the
i915_error_state file instead).


** Attachment added: "dmesg, i915_error_state, lspci, uname, Xorg logs, xorg.conf"
   http://launchpadlibrarian.net/43328960/gpuhang.tar.bz2

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display freezes, [drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... GPU hung
https://bugs.launchpad.net/bugs/507504
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