As a workaround you should be able to avoid the radeon Xorg driver with a custom config, something like:
Section "Device" Identifier "MyRadeon" Driver "modesetting" BusID "pci:1:0:0" EndSection Then it will use the same interfaces as in a Wayland session. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1923153 Title: [radeon] Display output laggy from iGPU when operating on desktop with attaching AMD R7 430 graphic (dGPU) To manage notifications about this bug go to: https://bugs.launchpad.net/oem-priority/+bug/1923153/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs