[Bug 107559] New: no color format choice in amdgpu

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107559

            Bug ID: 107559
           Summary: no color format choice in amdgpu
           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: zamundaaalp at gmail.com
        QA Contact: xorg-team at lists.x.org

Created attachment 141066
  --> https://bugs.freedesktop.org/attachment.cgi?id=141066&action=edit
The xorg log

I have a really crappy Philips "HD ready" tv. This tv has no options to change
the color format, and it always assumes full rgb. The problem is now that I
upgraded my graphics card, and now with the RX 580 I'm using the amdgpu driver.
amdgpu chooses YCrCb or limited RGB (but seemingly not reported as supported,
so not likely) automatically instead of RGB, and all my colors look really bad.
Black levels are grey and everything looks washed out and blurry.
>From xorg log:
Information     [     6.523] (II) AMDGPU(0): Supported color encodings: RGB
4:4:4 YCrCb 4:4:4 

If I use an adapter and plug it in via DVI instead of HDMI, it looks fine. That
has its compromises though (I now have to connect my 2nd monitor by a VGA to
HDMI adapter, and that has its issues). Kernel 4.18 also breaks this
work-around; it doesn't recognize any resolutions, and seemingly no EDID at
all. HDMI is same as before.
I also tried overriding the EDID and setting YCrCb as not supported, but failed

The solution to all of this hassle would be to have the option "output_csc"
available on amdgpu as it's apparently possible with radeon

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