[Bug 110496] [GLK] no signal - with samsung 4k TV - HDMI UHD Color (ENABLED)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110496

--- Comment #24 from sergey79 at gmail.com ---
I did some more testing and I was wrong about 12-bit color. The issue is not
limited to 12-bit modes. RGB 8-bit 4k @60Hz does not work either.

Looks like the issue has something to do with the HDMI link speed. All modes
that require the link speed of > 9.0Gbps don't work.

Is it possible to force the driver to use YCbCr 422 12-bit instead of RGB 8-bit
for 24-30Hz 4K modes? This should give a better quality/less color banding when
watching videos encoded in 10-bit.

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