I had the issue when going from driving my two 4k monitors with usb-c directly to going through a thunderbolt 4 hub that then did HDMI out (Caldigit).
After some searching it seems HDMI conversion can trigger it. Switched to a TB4 hub that did usb-c to monitors (which uses display port instead, Kensington) and radeon high side idle went back down and fans slowed down.
Will be happy to move to Apple Silicon just for the lack of fan noise.
After some searching it seems HDMI conversion can trigger it. Switched to a TB4 hub that did usb-c to monitors (which uses display port instead, Kensington) and radeon high side idle went back down and fans slowed down.
Will be happy to move to Apple Silicon just for the lack of fan noise.