[Bug 70764] New: Freezing and drm ring_stuck log errors after latest commit: Enable TearFree rendering for transformed scanouts

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70764

          Priority: medium
            Bug ID: 70764
          Assignee: chris at chris-wilson.co.uk
           Summary: Freezing and drm ring_stuck log errors after latest
                    commit: Enable TearFree rendering for transformed
                    scanouts
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: francisbrwn9 at gmail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: git
         Component: Driver/intel
           Product: xorg

Bisected to latest commit: d788b69fdb5ea73b1d283a89e53b2b19eaa90e6e

sna: Enable TearFree rendering for transformed scanouts

On a:
Ubuntu linux saucy
Kernel 3.11.0-12-generic (3.11.3?)
xorg 1.14.3 
SNB: HD3000 mobile

with tearfree enabled by xorg.conf

have X freezing for several seconds at a time and a corresponding error in
kernel log of

[drm:ring_stuck] *ERROR* Kicking stuck semaphore on render ring

occasionally appended by 

[drm] capturing error event; look for more information in
/sys/kernel/debug/dri/0/i915_error_state
[drm:i915_set_reset_status] *ERROR* render ring hung inside bo (0x575a000 ctx
0) at 0x575aa64

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