https://bugs.freedesktop.org/show_bug.cgi?id=98333

--- Comment #7 from John Bridgman <john.bridgman@amd.com> ---
The NVidia ticket suggests this might be an EDID issue, with the display saying
that it supports 4:2:2 at 4K/60 Hz when in fact it only supports 4:2:0.

Or could have been an NVidia driver bug that caused problems when modes for
both 4:2:2 and 4:2:0 were available, hard to say. Anyways, seems like if we can
get the driver to try 4:2:0 (possibly ignoring the monitor to do so) then it
should work at 60 Hz.

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