[Bug 97423] New: Lenovo ThinkPad X1 Carbon GPU hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97423

            Bug ID: 97423
           Summary: Lenovo ThinkPad X1 Carbon GPU hang
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: mark.hedges.data at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 125931
  --> https://bugs.freedesktop.org/attachment.cgi?id=125931&action=edit
GPU crash dump

GPU hangs when using LibreOffice Writer.  Always happens every once in a while,
while typing.  It goes out to lunch for 15 seconds and then comes back when the
chip resets.  System does not respond at all during that time.  I lose the
keystrokes in the meantime.  It seems to be only on this one document... maybe
a weird font rendering issue?

Tried adding intel_iommu=igfx_off to boot params but that did not help, so I
removed that option for this test.

`uname -m`      x86_64
`uname -r`      4.6.0-1-rt-amd64
Linux:          Debian Stretch
Machine:        Lenovo X1 Carbon 4th gen
Display:        Built-in 14" WQHD 2560x1440 IPS, 300 nits
Batch buffer:   Attached
dmesg debug:    Attached (using "drm.debug=0x1e log_buf_len=1M")


Syslog excerpt:

===========================================
Aug 20 13:51:10 walnut kernel: [  353.815999] [drm] stuck on render ring
Aug 20 13:51:10 walnut kernel: [  353.816385] [drm] GPU HANG: ecode
9:0:0x86dffffd, in Xorg [2650], reason: Ring hung, action: reset
Aug 20 13:51:10 walnut kernel: [  353.816389] [drm] GPU hangs can indicate a
bug anywhere in the entire gfx stack, including userspace.
Aug 20 13:51:10 walnut kernel: [  353.816392] [drm] Please file a _new_ bug
report on bugs.freedesktop.org against DRI -> DRM/Intel
Aug 20 13:51:10 walnut kernel: [  353.816394] [drm] drm/i915 developers can
then reassign to the right component if it's not a kernel issue.
Aug 20 13:51:10 walnut kernel: [  353.816396] [drm] The gpu crash dump is
required to analyze gpu hangs, so please always attach it.
Aug 20 13:51:10 walnut kernel: [  353.816398] [drm] GPU crash dump saved to
/sys/class/drm/card0/error
Aug 20 13:51:10 walnut kernel: [  353.818723] drm/i915: Resetting chip after
gpu hang
Aug 20 13:51:12 walnut kernel: [  355.816648] [drm] RC6 on
===========================================

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