[Bug 59339] [ILK] I-G-T/kms_flip subtest: 'flip-vs-panning' fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59339

--- Comment #6 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
Created attachment 74690
  --> https://bugs.freedesktop.org/attachment.cgi?id=74690&action=edit
Trace script

I can't really think if any sensible reason for this problem. Even if the pan
operation would overtake the flip (which it can with the current code) the
frame
count should still go forwards. Here it seems to stuck to the previous value.
Well, I suppose the vblank code can be buggy (at least it's needlessly
complex).

Anyways, if you can reproduce with CONFIG_FUNCTION_TRACER enabled, this script
may help us see what's going on.

1. start the trace script as root and redirect the output to some file
2. run kms_flip --run-subtest flip-vs-panning
3. stop the trace script
4. attach the trace log _and_ the errors from kms_flip to the bug
   the kms_flip errors are needed so that we know where in the log to start
   looking

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