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
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https://bugs.launchpad.net/bugs/1923153
Title:
[radeon] Display output laggy from iGPU when operating on desktop with
attaching AMD R7 430 graphic (dGPU)
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