[Bug 59824] [snb] External DP monitor goes black during heavy display activity

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59824

--- Comment #15 from Daniel Vetter <daniel at ffwll.ch> ---
(In reply to comment #14)
> (In reply to comment #13)
> > (In reply to comment #12)
> > > Tested with drm-intel-nightly 06653b7 and experienced the same problem.
> > 
> > Can you please boot with drm.debug=0xe and check whether you see any "FIFO
> > underrun" reports?
> 
> Playing 4k youtube video, the screen went back and this was logged :
> 
> [drm:ilk_display_irq_handler], Pipe B FIFO underrun
> [drm:cpt_serr_int_handler], PCH transcoder B FIFO underrun

Can you please attach the complete dmesg (with debugging enable) where an
underrun happens? Just so that we have a bit of context of what's going on
around. But sounds like you need the watermark fixes Ville is working on.

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