[Bug 107515] [CI][DRMTIP] igt at kms_atomic_transition@plane-all-transition-nonblocking - dmesg-warn - *ERROR* fifo underrun on pipe A

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107515

--- Comment #9 from harish.chegondi at intel.com ---
This failure still happens on CI HSW machine fi-hsw-peppy few times every month
or two. 

plane-all-transition-fencing test:
For all the display pipes with valid output, the test runs transition test with
fencing enabled. From the test source, these are the steps performed in the
test:

1. Set primary plane to a known FB.
2. Make sure getcrtc returns the correct FB ID.
3. Call RMFB on the FB.
4. Make sure getcrtc returns 0 FB ID.

RMFB is supposed to free the framebuffers from any and all planes,
so test this and make sure it works.

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