[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 #37 from teeedubb at gmail.com ---
(In reply to sergey79 from comment #36)
> I tested this Samsung TV with an AMD Athlon 200GE (Raven Ridge) system and
> there were no issues in UHD Color mode. Note that AMD driver default to
> YCbCr 422/444 in all 4K modes. 
> 
> Now I'm 90% sure that in "high speed" 594 Mhz HDMI modes those Samsung TVs
> expect YCbCr rather than RGB. We need an option to to make the color space
> switchable and not limited to RGB. RGB is obviously not the best option for
> some displays.

Sergey, you are correct. I have revisited this while trying to get HDR output
working on my TV with GLK hardware. I have attached a screenshot of the
relevant page.

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