Comment # 7
on bug 98333
from John Bridgman
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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