AMD Radeon - Gamma

[Canoe]

I’ve just switched from an nVidia RTX3070 to an AMD RX 6700XT. I had a variety of settings I used with nVidia to support visual impairment (low vision). While high contrast works, I’m having trouble finding a way to set gamma levels correctly.

Previously I’d set the below to autorun at boot in a script ;

nvidia-settings -a 0/RedGamma[DP-0]=0.644000 -a 0/BlueGamma[DP-0]=0.644000 -a 0/GreenGamma[DP-0]=0.644000

Is there any way I can do the same with AMD? I’d switched for the easier experience with open-source drivers, hopefully gamma’s an option, even via cli. Appreciate the support!

–
[Edit with a potentially clunky resolution]
So I’ve dumped an xrandr command to replace the above, it’s clunky but does the job until I can get Gamma to work in Wayland :

xrandr --output DisplayPort-2 --gamma 0.644:0.644:0.644

[dalto]

I would first check if you DE supports it. For example, plasma has built in controls for setting gamma levels.

If not, check out tools like xgamma and redshift.

[Canoe]

That’s the weird thing, KDE Plasma isn’t showing anything for gamma in settings: I’m not sure if I’m missing a pre-requisite, it’s a fresh install of EOS.

[dalto]

Are you using X or Wayland?

I have the same GPU as you and I see them on X11.

[Canoe]

echo $XDG_SESSION_TYPE shows X11 (I don’t think it’s possible to easily set gamma in Wayland yet… I haven’t fully looked at colord profiles).

[dalto]

Here is what I am using for drivers:

pacman -Q | grep -E "mesa|amd|radeon"
lib32-mesa 23.1.4-2
lib32-vulkan-radeon 23.1.4-2
libva-mesa-driver 23.1.4-2
mesa 23.1.4-2
mesa-utils 9.0.0-2
mesa-vdpau 23.1.4-2
vulkan-radeon 23.1.4-2
xf86-video-amdgpu 23.0.0-1

[Canoe]

@dalto

pacman -Q | grep -E "mesa|amd|radeon"

Thanks, that’s really helpful to troubleshoot. I’m showing the below, so it looks like I’m missing a few components, thanks for pointing me in the right direction,

amdvlk 2023.Q2.3-1
lib32-amdvlk 2023.Q2.3-1
lib32-mesa 23.1.4-2
mesa 23.1.4-2
mesa-utils 9.0.0-2
xf86-video-amdgpu 23.0.0-1

[Canoe]

@dalto

pacman -Q | grep -E "mesa|amd|radeon"

Covering off the missing packages didn’t bring anything back to Plasma settings for gamma after a reboot, but I think the xrandr option will suffice for now.

Final update : Looks like kgamma5 is missing from the latest EOS iso, - installing that resolves the issue.

[dalto]

On a positive note, replacing amdvlk with radeon-vulcan should help if you use vulcan for anything.

Also, the vdpau and libva drivers should give you hardware decoding for video.