[Bug 79996] New: [SNB bisected] GPU hang Linux 3.15 (Shuttle SH67, Xeon E3 1235)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79996

          Priority: medium
            Bug ID: 79996
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [SNB bisected] GPU hang Linux 3.15 (Shuttle SH67, Xeon
                    E3 1235)
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: jclw at ymail.com
          Hardware: x86-64 (AMD64)
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Bisecting led to commit 8d85d27 "drm/i915: Fix SNB GT_MODE register setup".

Apparently the "disable all bits" part originally introduced in f8f2ac9 is
still needed, at least in my particular case.

Applying commit 8d85d27 but keeping the line
I915_WRITE(GEN6_GT_MODE, _MASKED_BIT_DISABLE(0xffff));
in intel_pm.c solves the problem for me, i.e. the GPU no longer hangs when
first starting anything more demanding than an xterm, like firefox or glxgears.

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