[Bug 110362] New: Need an option to set HDMI out to Full RGB 4:4:4

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue Apr 9 06:34:47 UTC 2019


            Bug ID: 110362
           Summary: Need an option to set HDMI out to Full RGB 4:4:4
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/AMDgpu
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: Heiko.Lechner at ruhr-uni-bochum.de
        QA Contact: xorg-team at lists.x.org


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.

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