[Bug 96781] [skl dp-mst] oops in atomic commit

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96781

--- Comment #44 from Chris Down <freedesktop at chrisdown.name> ---
Created attachment 129434
  --> https://bugs.freedesktop.org/attachment.cgi?id=129434&action=edit
/sys/class/drm/card0/error

Less than a day after I made that comment I got a hard lockup, typical :-(

/sys/class/drm/card0/error is attached. No messages about flip_done timing out
now, instead I get this:

[ 9945.797615] [drm] GPU HANG: ecode 9:0:0xfffffffe, in Xorg [1858], reason:
Hang on render ring, action: reset
[...]
[ 9945.797628] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[ 9945.797708] drm/i915: Resetting chip after gpu hang
[ 9945.800332] [drm] RC6 on
[ 9945.813539] [drm] GuC firmware load skipped

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