[Bug 100215] [SNB][IVB][BAT] kms_cursor_legacy at basic-busy-flip-before-cursor-atomic fails in CI

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100215

--- Comment #27 from Maarten Lankhorst <bugs at mblankhorst.nl> ---
Created attachment 131460
  --> https://bugs.freedesktop.org/attachment.cgi?id=131460&action=edit
ftrace, weird vblank timings

In this ftrace the difference in basic-busy-flip-before-cursor-legacy between
vblank_start and the get_vblank() at the end is 3, while 1 is expected.

The timing of calls to drm_handle_vblank looks wrong. They should be 16.7ms
apart, but it doesn't look to be the case here. After the read() it's called 3
times in a row, only 1 ms apart.

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