[Bug 98214] drm/i915: WARN_ON_ONCE(!crtc_clock || cdclk < crtc_clock)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98214

--- Comment #8 from Paul Bolle <pebolle at tiscali.nl> ---
(In reply to Joseph Yasi from comment #6)
> It coincides with the screen going black for about a second and returning.

> [Mon Oct 24 20:39:54 2016] [drm:gen8_irq_handler [i915]] *ERROR* CPU pipe A
> FIFO underrun

The screen going black could be related to that *ERROR*.

I'm seeing something similar too (but it coincides with a very quick, well,
flashing of the screen). In my case it looks independent of this annoying
WARNING. Ie, most of these WARNINGs happen without a nearby FIFO underrun
*ERROR* and vice versa.

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