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

Submitted by Piotr Kasp.

Assigned to Shashank Sharma @contactshashanksharma

Link to original bug (#110496)

Description

Created attachment 144072
NUC with UHD color enabled at 1080p then I switch resolution to 4k

Hi
For some reason on Gemini Lake NUC - NUC7CJYH
Latest DRM-tip kernel - latest firmware in Samsung QLED 2018
There is no signal if "HDMI UHD color" is enabled for HDMI where is NUC connected


Here log where is HDMI UHD Color enabled (no signal on TV)
http://ix.io/1GSD

Here where HDMI UHD Color is Disable (no problem)
http://ix.io/1GSG


I Discover its working when is UHD color Enabled and 1080p resolution
but when you switch to 4k signal gone :(
I Attached log where I boot NUC with UHD color enabled at 1080p then I switch resolution to 4k and signal gone




EDID: http://ix.io/1GSV

Attachment 144072, "NUC with UHD color enabled at 1080p then I switch resolution to 4k":
UHDcolor_switch1080to4k.log

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