[Bug 83497] [BDW] Pipe A FIFO underrun errors with a 4k display

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=83497

--- Comment #1 from Damien Lespiau <damien.lespiau at gmail.com> ---
Huuum, a bit of a shot in the dark, but what happens if you boot with
i915.enable_ips=0. There's a known corruption case with IPS when dotclock > 95%
cdclock (which can happen here as you have an eDP 4k display, so IPS should be
running)

I wouldn't expect an underrun here given the description of the IPS problem we
have, but it's an easy thing to try.

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