KDE 6 + Chromium + Proxmox => Scrambled colors

I am experiencing an issue with KDE 6 when running in a Proxmox VM.
If I run Chrome (or any chromium based browser) on with that configuration, the colors are scrambled.

The issue only shows when running as a Proxmox-VM and when using Chrome, and only with KDE 6. Earlier KDE verisons work fine, Firefox as a browser works, and if I run it on a “bare iron” I am also not experiencing the issue.

The issue manifests of color being “inverted” in some way, especiallly skin tones often come out blue. People look like the smurfs. On top of that, what normally appears to be a shadow around the windows, appears as a black box:

I have spent days analyzing under which circumstances this happens.
It seems that the problem is the Combination of KDE 6, Proxmox, and Chromium.

I have posted about this (sorry for not posting links, but I am not allowed to)

  • On reddit “Chromium Color Glitch/Blue Smurf-Skin/Black Frame

  • in the Manjaro Forum “Proxmox + Chromium based brower => Scrambled colors

  • in the Proxmox Forum “Proxmox verdreht Farben in Chrome

Here some configurations I can reproduce the issue with:

  • Proxmox 8.2.7
  • Distributions:
    • Kubuntu 24.10
    • Manjaro/Plasma (Both Stable and Unstable branch)

To reproduce the issue, once Proxmox is installed, the issue can be reproduced with the distribution’s live CD. Here my configuration/steps to reproduce:

Kubuntu

  1. New VM (1 CPU/4 Core/8GB Ram, rest default) - use Kubuntu image above.
  2. Boot/in the boot manager use the default (try or install)
  3. select “Try Ubuntu”
  4. Start-Menu/Konsole; enter:
sudo su
snap install chromium
exit
chromium

Manjaro

  1. New VM (1 CPU/4 Core/8GB Ram, rest default) - use Manjaro image above.
  2. Boot into Manjaro live ISO.
  3. Open a terminal
  • pamac install chromium
  • < enter > - (don’t install dependencies)
  • y - (apply the changes)
  • chromium

Same problem with a bare metal Kubuntu 24.10 install, on AMD Radeon RX 6400/6500 XT/6500M: chromium colors are totally bonkers.

Example taken from github . com / siemens / edgeshark README…

Chromium with weird colors, the shark emblem should be a teal/petrol-like color, not yellow-greenish:

Cannot upload second correct image as first post :frowning:

Might this be a compositor issue? When I view my own post here then the first invalid colors Chromium screenshot appears correct, but everything else on the page is just … weird.

Facing similar issue with latest kubuntu 24.10 amd ryzen. Any workaround ?

If you use proxmox, you can switch the emulated graphics card:

– Excerpt from my discussion in Proxmox bugzilla
The issue occurs with all CPUs I have tested, and with all graphics cards except for:

  • virtio
  • virtio-gl

If you are on a bare iron, use another window manager, or another browser…

thanks for reply @joetretter . I found this which could be the root cause /issues/372932102
on chromium issue tracker (can’t paste link here, you can easily google it). right now I am on kubuntu 24.10 with libgl1-mesa-dri 24.2.3. In launchpad I can see the latest one is libgl1-mesa-dri 24.2.8-1ubuntu1~24.10.1. hopefully it will fix the issue and will be available soon. Need to check on fedora assuming it will be the latest.

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Good call - I just tried it out here, and the issue doesn’t happen anymore.

pamac list | grep -i mesa                                                                                                                                 
lib32-mesa                         1:24.2.8-1                   multilib  99.8 MB
lib32-mesa-utils                   9.0.0-2                      multilib  467.1 kB
mesa                               1:24.2.8-1                   extra     116.9 MB
mesa-utils                         9.0.0-5                      extra     796.4 kB
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after kicking out the amdgpu proprietary drivers I finally got the Ubuntu mesa updates and now chromium shows correct colors again. phew.