[Bug 104824] New: GPU hang code 9:0:0x85dffffb reason Hang on rcs0; reset

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104824

            Bug ID: 104824
           Summary: GPU hang code 9:0:0x85dffffb reason Hang on rcs0;
                    reset
           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: peter.chubb at data61.csiro.au
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 137012
  --> https://bugs.freedesktop.org/attachment.cgi?id=137012&action=edit
copy of /sys/class/drm/card0/error

I'm running the top-of-tree Linux kernel; revision
1f07476ec143bbed7bf0b641749783b1094b4c4f

The X server randomly hangs; I can't work out what triggers the problem.  I'm
not doing anything graphics intensive --- just emacs and xterms.  This can
happen anywhere from a few minutes after boot to after several hours; but I
haven't had a full day's work without a hang for a couple of weeks.

The bug is in a Dell laptop, that uses vga_switcheroo to swap between the i915
and an AMD  R9 M295X.  


dmesg output: 
GPU HANG: ecode 9:0:0x85dffffb, in Xorg [2752], reason: Hang on rcs0, action:
reset
[ 1798.822701] [drm] GPU hangs can indicate a bug anywhere in the entire gfx
sta
ck, including userspace.
[ 1798.822702] [drm] Please file a _new_ bug report on bugs.freedesktop.org
agai
nst DRI -> DRM/Intel
[ 1798.822702] [drm] drm/i915 developers can then reassign to the right
componen
t if it's not a kernel issue.
[ 1798.822703] [drm] The gpu crash dump is required to analyze gpu hangs, so
please always attach it.
[ 1798.822704] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[ 1798.822708] i915 0000:00:02.0: Resetting rcs0 after gpu hang
[ 1806.782831] i915 0000:00:02.0: Resetting rcs0 after gpu hang
[ 1814.846833] i915 0000:00:02.0: Resetting rcs0 after gpu hang
[ 1822.846846] i915 0000:00:02.0: Resetting rcs0 after gpu hang
[ 1830.814860] i915 0000:00:02.0: Resetting rcs0 after gpu hang
[ 1833.878873] [drm] Reducing the compressed framebuffer size. This may lead to
less power savings than a non-reduced-size. Try to increase stolen memory size
if available in BIOS.

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