[Bug 79041] New: X freezes periodically

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79041

          Priority: medium
            Bug ID: 79041
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: X freezes periodically
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: major
    Classification: Unclassified
                OS: Linux (All)
          Reporter: ctuffli at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: unspecified
         Component: DRM/Intel
           Product: DRI

Created attachment 99542
  --> https://bugs.freedesktop.org/attachment.cgi?id=99542&action=edit
GPU crash dump

Running Xubuntu 14.04, the desktop periodically (at least once per week)
freezes, but can be "fixed" by switching to a virtual terminal and rebooting.
The end of dmesg shows:
...
174290.346217] [drm] stuck on render ring
[174290.346226] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[174290.346228] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[174290.346230] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[174290.346233] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[174290.346235] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[174290.349597] [drm:i915_set_reset_status] *ERROR* render ring hung inside bo
(0x929f000 ctx 0) at 0x929f55c
[174296.346616] [drm] stuck on render ring
<last entry repeats>

While the crash doesn't appear to be associated with a specific application, it
seems to happen when resizing windows. lspci lists the device as:

00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated
Graphics Controller (rev 12) (prog-if 00 [VGA controller])
        Subsystem: Intel Corporation Device 0036
        Flags: bus master, fast devsel, latency 0, IRQ 44
        Memory at fe000000 (64-bit, non-prefetchable) [size=4M]
        Memory at d0000000 (64-bit, prefetchable) [size=256M]
        I/O ports at f100 [size=8]
        Expansion ROM at <unassigned> [disabled]
        Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
        Capabilities: [d0] Power Management version 2
        Capabilities: [a4] PCI Advanced Features
        Kernel driver in use: i915

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