I'm running triple screens. When running as extended, everything is perfect. When I enable eyefinity, "usually" everything is perfect. When I discard the eyefinity group, the two outer screens (L & R) go dim. Not black. just dim. If I re-enable eyefinity, they come back to normal brightness. Discard again, both go dim.
Occasionally, maybe 1 in 10 times, the right screen goes dim after enabling eyefinity - which is why i said 'usually'.
The only way to restore normal brightness when extended is to reboot.
RX 590 8Gb
I've reinstalled the radeon package. no luck.