See also bug 1978905 where this was previously fixed for Nvidia/Intel. Makes me wonder if a workaround is possible in /etc/environment using something like:
MUTTER_DEBUG_USE_KMS_MODIFIERS=0 (and then reboot) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2163790 Title: [Wayland][Multi-GPU] External HDMI monitor on NVIDIA dGPU suffers from severe mosaic artifacts/flickering when AMD iGPU is selected as Primary GPU (Reverse-PRIME DMA-BUF sync issue) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2163790/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
