Device found: Beyerdynamic MMX-150 #15
Description
The volume wheel/mute button is its own HID device that is active the entire time.
As it is a generic driver there is some fiddling required in device manager to find the proper "HID-compliant consumer control device", but the best way is just opening the Properties (right-click -> Properties) of all of them and unplugging the headset to see which devices gets an Error 45. This device needs to be disabled.
Afterwards (if no other device interferes) the idle checker should report the system being able to go idle again.
Originally found this on Reddit here:
https://www.reddit.com/r/BEYERDYNAMIC/comments/w6l5wa/mmx_150_stops_screensavers_and_sleep_mode/