[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 #39 from teeedubb at gmail.com ---
(In reply to shashank.sharma at intel.com from comment #33)
> > I have a theory that maybe the TV expects 422 rather than RGB for 4K with deep > color. But I have no idea how to force the ycb422 output on Gemini Lake. 
> 
> This could be the case, and we don't support YCBCR422 yet. Its Either RGB888
> or YCBCR420 if that's from 420VDB.
> 
> - Shashank

How can YCBCR420 be enabled? I can not see anything even resembling that mode
in xrandr's verbose output.

All I see is
"Colorspace: BT2020_CYCC
supported: Default, SMPTE_170M_YCC, BT709_YCC, XVYCC_601, XVYCC_709, SYCC_601,
opYCC_601, opRGB, BT2020_CYCC, BT2020_RGB, BT2020_YCC, DCI-P3_RGB_D65,
DCI-P3_RGB_Theater"

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