I use a Samsung Odyssey Neo G9 57" as my main monitor, on one of two Macbooks in clamshell mode, connected via a Startech USB hub.

When I unplug the usb hub from one macbook and plug it into the other, the screen stays mostly black for 10+ seconds, only displaying screen popups like "HDMI 1 connected" or "no input, sleeping in 3 seconds". (Oddly, sometimes it will wake up on its own after displaying the "no input" popup.)

If I connect the screen directly to my macbook via HDMI, bypassing the hub, it still has the same problem, though seems to go down to only about 6 seconds of delay.

The system also requires me to press keys on the keyboard to wake it up, rather than waking up upon the cable being connected.

Will pay you M$10,000 if you suggest a reasonably doable fix that works. Resolves NO if no one does before February.