[Bug 82523] New: Periodic Crashes on Haswell Graphics for Acer c720

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82523

          Priority: medium
            Bug ID: 82523
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: Periodic Crashes on Haswell Graphics for Acer c720
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: jesse.osiecki at gmail.com
          Hardware: Other
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Created attachment 104522
  --> https://bugs.freedesktop.org/attachment.cgi?id=104522&action=edit
/sys/class/drm/card0/error

I am using Ubuntu 14.04 on an Acer c720. Every couple of hours it will freeze
for about five seconds, afterwards the framebuffer displays corrupt fonts in
any window that may have been open. Closing and reopening has worked until now;
I was fed up so I checked the kerne.log with grep drm and found:

Aug 12 15:09:30 jesse-Peppy kernel: [ 5843.976707] [drm] stuck on render ring
Aug 12 15:09:30 jesse-Peppy kernel: [ 5843.976715] [drm] GPU crash dump saved
to /sys/class/drm/card0/error
Aug 12 15:09:30 jesse-Peppy kernel: [ 5843.976719] [drm] GPU hangs can indicate
a bug anywhere in the entire gfx stack, including userspace.
Aug 12 15:09:30 jesse-Peppy kernel: [ 5843.976721] [drm] Please file a _new_
bug report on bugs.freedesktop.org against DRI -> DRM/Intel
Aug 12 15:09:30 jesse-Peppy kernel: [ 5843.976724] [drm] drm/i915 developers
can then reassign to the right component if it's not a kernel issue.
Aug 12 15:09:30 jesse-Peppy kernel: [ 5843.976727] [drm] The gpu crash dump is
required to analyze gpu hangs, so please always attach it.

I also found a thread on reddit (by accident)
http://www.reddit.com/r/chrubuntu/comments/2d88dg/freezing_on_c720_ideas/
The poster there sent me his /sys/class/drm/card0/error output, so I am
attaching both of ours.

It should also be noted that I was running the linux-next kernel yesterday, and
this happend as well.

One more thing, as this is the Acer c720, there were a few kernel flags in grub
that I used (and most people use) to make it run well with a kernel such as
3.13 (which we both have). Some of them might not be necessary in 3.16
(linux-next), but I left them in place, and I suspect that they may be the
catalyst of the problem. They are:
GRUB_CMDLINE_LINUX_DEFAULT="add_efi_memmap boot=local noresume noswap
i915.modeset=1 tpm_tis.force=1 tpm_tis.interrupts=0 nmi_watchdog=panic,lapic"

Thanks guys! I'll look into it as more as well, but I thought I should post it
here as I finally have all of the info

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