[Bug 79009] New: Display hangs but mouse cursor moves, kernel reports "[drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... render ring idle", G43 chipset

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79009

          Priority: medium
            Bug ID: 79009
          Assignee: chris at chris-wilson.co.uk
           Summary: Display hangs but mouse cursor moves, kernel reports
                    "[drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer
                    elapsed... render ring idle", G43 chipset
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: rah at bash.sh
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: 7.7 (2011)
         Component: Driver/intel
           Product: xorg

Created attachment 99491
  --> https://bugs.freedesktop.org/attachment.cgi?id=99491&action=edit
Kernel log of two repeated hangs, the last part of the kernel log before the
first hang and the entirety of the log before the second hang

Using vanilla Linux 3.14, X server 1.12.4 and Intel driver 2.21.15 and GNOME 3
on a G43 chipset, I get random lockups of the X desktop.  The mouse cursor
moves but the rest of X is dead; nothing responds.  I can switch to the console
(in order to reboot the computer) but if I switch back to X then the machine
will hard lock within a short period.  After switching to the console, after a
short delay the kernel will report:

[drm:i915_hangcheck_elapsed] *ERROR* Hangcheck timer elapsed... render ring
idle

This definitely happens a lot while composing emails in Evolution (and is
therefore EXTREMELY ANNOYING :-).  I get the feeling it may happen some time
after having dragged a window to a side edge of the screen to half-maximise it.

The lockups seem to happen in clumps.  That is, for weeks the machine will be
stable with no problems but then there will be one lockup followed by another
lockup, sometimes within minutes of rebooting, and sometimes repeating a number
of times, eventually ending by my giving up using the computer.

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