Need an option to set HDMI out to Full RGB 4:4:4

Submitted by Heiko Lechner

Assigned to Default DRI bug account

Link to original bug (#110362)

Description

Hi!

I have an old tv that only works well with FullRGB HDMI signals.
If YCbCr is used then the tv interrupts the hdmi link every few minutes and after a new hdmi negotiation the screen turns greenish. So I have to switch to another hdmi input and switch back to force a new negotiation which maybe works- very annoying.

Running Windows I can switch the output to FullRGB in AMD Radeon Software Adrenalin edition and everything is fine, so I assume that in Linux YCbCr is used by default (too).

In X.Org log file I find "AMDGPU(0): Supported color encodings: RGB 4:4:4 YCrCb 4:4:4" so it seems to be possible.

But X.Org config:

Option "ColorRange""Full"
Option "ColorSpace""RGB"

Is ignored.