[Bug 91152] New: 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

            Bug ID: 91152
           Summary: On kernel 4.1.0 with HD Graphics 5500, GPU hangs at
                    boot time before Xorg started
           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: sami.liedes at iki.fi
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 116807
  --> https://bugs.freedesktop.org/attachment.cgi?id=116807&action=edit
/sys/class/drm/crad0/error, bzip2 compressed

On a Dell XPS 13 9343 laptop with HD Graphics 5500, kernel 4.1.0 reports a GPU
hang at boot, even without starting Xorg. On kernel 4.0.6 this does not happen
and X works. Happens with 100% reproducibility over 5-10 boot attempts.

Booting the kernel to rescue mode (and thus not starting Xorg), I used the text
console (which still works) to extract dmesg and /sys/class/drm/card0/error;
these are attached. At that point I'm already getting GPU hung messages.

(Note that the dmesg capture shows too old firmware for iwlwifi. Suspecting
that that might have caused global weirdness, just to be sure I also verified
that installing newer iwlwifi firmware doesn't fix the GPU hang.)

    7.725370] [drm] GPU HANG: ecode 8:0:0x00dfffff, reason: Ring hung, action:
reset
[    7.725398] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
stack, including userspace.
[    7.725431] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[    7.725461] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[    7.725494] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[    7.725525] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[    7.726654] drm/i915: Resetting chip after gpu hang
[    7.726888] dmar: DRHD: handling fault status reg 2
[    7.726923] dmar: DMAR:[DMA Write] Request device [00:02.0] fault addr
1694000 
               DMAR:[fault reason 23] Unknown
[   13.729606] [drm] stuck on render ring
[   13.732013] [drm] GPU HANG: ecode 8:0:0xfffffffe, reason: Ring hung, action:
reset
[   13.733581] [drm:i915_set_reset_status [i915]] *ERROR* gpu hanging too fast,
banning!
[   13.735190] drm/i915: Resetting chip after gpu hang
[   19.734356] [drm] stuck on render ring
[   19.736707] [drm] GPU HANG: ecode 8:0:0x00dfffff, reason: Ring hung, action:
reset
[   19.740359] drm/i915: Resetting chip after gpu hang

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