[Bug 93640] [BAT SNB regression] Fifo underruns since CI_DRM_952

[bugzilla-daemon at freedesktop.org]

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

--- Comment #4 from Daniel Vetter <daniel at ffwll.ch> ---
(In reply to Matt Roper from comment #3)
> My above patch/comment was actually intended for bug 93666; disregard for
> this defect since it likely isn't related to underruns.
> 
> If I'm reading the CI details correctly, it's not just SNB that gets the
> underruns, but also ILK and IVB.  However HSW/BDW, which use pretty much the
> same watermark logic and code, are fine.  I'll take a look to see if I can
> figure out the source of the problems.  Unfortunately I don't have any of
> these platforms at the moment so debugging is somewhat challenging.

Yeah, I made the bug report before Tomi restored machines to operability (due
to the ww mutex deadlock that killed them).

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