While I do not have the headset on, my GPU is running at 810mhz,
I just have the application open and my GPU is hit pretty hard for no reason.
Yeah, if dektop app is opened and even the screens are not eanbled, my 1080 runs at 1.6ghz and memory is on full. THere's no need for this.
Is your proximity sensor covered? I have a soft VR Cover which sometimes "drags" a bit and the proximity-sensor thinks you have the HMD open.
At least that was the case for me in the past.