[Bug 93640] [BAT ILK SNB IVB bisected] Fifo underruns since CI_DRM_952

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93640

--- Comment #8 from Daniel Vetter <daniel at ffwll.ch> ---
Interesting new observatin I've just made: I can only repro the fifo underrun
once per pipe on my snb: First on boot-up on pipe A, then once more with an igt
on pipe B. Reloading the module resets this, and I can repro once more.

I can't really reconcile this with the CI results since I thought CI runtime
ordering of testcases isn't that stable ... but assuming it's indeed only the
first time we use a pipe: Some bug in the initial setup that breaks the wm
code?

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