[Bug 85898] [IVB/HSW]igt/kms_flip subcases sporadically cause *ERROR* uncleared pch fifo underrun on pch transcoder A

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=85898

--- Comment #5 from Daniel Vetter <daniel at ffwll.ch> ---
(In reply to Ville Syrjala from comment #4)
> (In reply to Daniel Vetter from comment #3)
> > I wonder whether we should tune down underrun warnings on the PCH, seems to
> > happen why too often in random circumstances ...
> 
> IIRC I saw something like this on my IVB, but only with the non-existing VGA
> connector. I didn't post the patch since I couldn't be sure if it was just
> specific to that machine. As I recall, the cure involved rearranging the PCH
> underrun reporting disable/enable points a bit. I can see if I can still
> reproduce it here and maybe resurrect that patch, or recreate it if I can't
> find it anymore.

Well we also have reports that the pch underruns at boot-up/takeover. So
something is definitely still amiss and it should be easy to get a few
tested-bys from reporters if you have a patch.

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