I have been running with the onboard video disabled in the motherboard BIOS. Using GPU0 as primary display in the 16x slot. Running 10.3(.1?) and have the same issues. Appreciate everyone trying to help.
No idea then. Was it ok some day before?
Sometimes AMD drivers do weird things. I may suggest to uninstall all drivers using DDU utility (display driver uninstaller), reboot and install them again. Sometimes such things help.