[Bug 216814] New: amdgpu: CTM support has disappeared (vega)

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216814

            Bug ID: 216814
           Summary: amdgpu: CTM support has disappeared (vega)
           Product: Drivers
           Version: 2.5
    Kernel Version: 6.0
          Hardware: AMD
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: maxijac@free.fr
        Regression: No

Hello,

I noticed the CTM support from X is no longer advertised with recent kernels.

Card: Vega64
xf86-video-amdgpu: 22.0.0-1

With older kernels, xrandr reports CTM correctly.
With the same X stack, simple rebooting on a more recent kernel, CTM is not
advertised anymore.


>$ uname -r
>5.15.83-1-lts
>$ xrandr --prop | grep -i ctm
>        CTM: 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0
>        CTM: 0
>        CTM: 0
>        CTM: 0
>        CTM: 0
>        CTM: 0 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0
>$
> 

> -- Reboot to 6.1 --

> 
>$ uname -r
>6.1.0-arch1-1
>$ xrandr --prop | grep -i ctm
>$

I also have a custom config 6.0 kernel that shows no CTM so the break has
happened between 5.15 and 6.0.
I tried looking at commits in between and code changes in amdgpu but did not
notice anything obvious.

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