Bug 110362

Summary:	Need an option to set HDMI out to Full RGB 4:4:4
Product:	DRI	Reporter:	Heiko Lechner <Heiko.Lechner>
Component:	DRM/AMDgpu	Assignee:	Default DRI bug account <dri-devel>
Status:	RESOLVED MOVED	QA Contact:
Severity:	normal
Priority:	medium	CC:	harry.wentland, magist3r, nicholas.kazlauskas
Version:	unspecified
Hardware:	x86-64 (AMD64)
OS:	Linux (All)
Whiteboard:
i915 platform:		i915 features:

Description Heiko Lechner 2019-04-09 06:34:47 UTC

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.

Comment 1 Michel Dänzer 2019-04-09 09:26:02 UTC

This needs to be supported by the kernel driver (first), reassigning.

(In reply to Heiko Lechner from comment #0)
> 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.

That's just Xorg itself printing information from EDID.

Comment 2 Martin Peres 2019-11-19 09:18:39 UTC

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