[Bug 85684] [BYT/BSW]igt/drv_hangman/kms_flip/gem_reset_stats sporadically causes *ERROR* Timed out: waiting for Render to ack

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85684

lu hua <huax.lu at intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |NEW

--- Comment #5 from lu hua <huax.lu at intel.com> ---
# cat /sys/module/i915/parameters/enable_ppgtt
0

Add i915_enable.ppgtt=1, it still happens.

igt_gem_workarounds_reset also has this error.
Dmesg:
<6>[ 8678.817582] [drm] stuck on render ring
<6>[ 8678.824135] [drm] GPU HANG: ecode 0:0x97f4fffe, in gem_workarounds
[20809], reason: Ring hung, action: reset
<6>[ 8678.824143] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
<6>[ 8678.824146] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
<6>[ 8678.824148] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
<6>[ 8678.824151] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
<6>[ 8678.824153] [drm] GPU crash dump saved to /sys/class/drm/card0/error
<3>[ 8678.824242] [drm:__vlv_force_wake_get [i915]] *ERROR* Timed out: waiting
for Render to ack.
<6>[ 8678.826343] [drm] Simulated gpu hang, resetting stop_rings
<5>[ 8678.826347] drm/i915: Resetting chip after gpu hang

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