[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 #14 from Jonathan Adamczewski <jadamcze at utas.edu.au> ---
(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

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