As a workaround you should be able to avoid the radeon Xorg driver with
a custom config, something like:
Section "Device"
Identifier "devname"
Driver "modesetting"
BusID "pci:bus:dev:func"
...
EndSection
--
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg-server in 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
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