[Bug 90106] New: GPU freeze / hang on ubuntu 14.10

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90106

            Bug ID: 90106
           Summary: GPU freeze / hang on ubuntu 14.10
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: ghostrider at trollaris.de
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 115201
  --> https://bugs.freedesktop.org/attachment.cgi?id=115201&action=edit
/sys/class/drm/card0/error

Using ubuntu 14.04 my i7 Sandy Bridge system with onboard graphics had no gpu
problems at all, using kernel boot parameters "i915.i915_enable_rc6=0" and 
"i915.semaphores=0".
After upgrading to 15.04 beta it would frequently slow down due to frequent
frequent gpu hangs / slow-downs / crashes, with or without the old i915 boot
parameters. The system became unusable. 
After a complete re-install using ubuntu 14.10 it crashed once after running
stably nearly a day (no i915 boot parameters were given). 
Memory checks had never failed.

This is what dmesg says:

[29907.376682] [drm] GPU HANG: ecode -1:0x00000000, reason: Kicking stuck
semaphore on render ring, action: continue
[29907.376684] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[29907.376685] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[29907.376685] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[29907.376686] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[29907.376687] [drm] GPU crash dump saved to /sys/class/drm/card0/error

So I did as ordered.

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