[Bug 91152] On kernel 4.1.0 with HD Graphics 5500, GPU hangs at boot time before Xorg started

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91152

--- Comment #3 from Sami Liedes <sami.liedes at iki.fi> ---
Created attachment 116828
  --> https://bugs.freedesktop.org/attachment.cgi?id=116828&action=edit
/sys/class/drm/card0/error with i915.enable_execlists=0; bzip2 compressed

With i915.enable_execlists=0, I get a single "[drm] stuck on render ring"/GPU
hang at boot. With intel_iommu=igfx_off, I see no GPU hangs and Xorg starts.

enable_execlists=0 case:

[    7.723370] [drm] stuck on render ring
[    7.724052] [drm] GPU HANG: ecode 8:0:0x00dfffff, reason: Ring hung, action:
reset
[    7.724081] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[    7.724113] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[    7.724145] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[    7.724177] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[    7.724209] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[    7.725348] drm/i915: Resetting chip after gpu hang

Contents of /sys/class/drm/card0/error with enable_execlists=0 attached.

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