Connected Standby not available in Windows 8? When the Hyper-V role is enabled on a Windows 8 computer, that uses the Always On / Always Connected power model, then the Connected Standby power state will not be available.

This behavior occurs because Hyper-V does not support the Connected Standby power state.

To regain the Connected Standby power state, you must disconnect the Hyper-V role, says KB2973536.