I have a similar problem.
somteimes after waking up from standby the screen of my TV is black until I hit a key, or move the mouse.
I have recognized, that every time the screen remains black, windows did NOT send the WM_POWERBROADCAST-Message (PBT_APMRESUMESUSPEND and/or PBT_APMRESUMEAUTOMATIC) after resuming. First when I hit a key, the WM_POWERBROADCAST messages arrived.
This behavior is only if the TVservice is running.
To avoid this problem I have wrote a small script which stops the TvService before the system is going to standby. And starting the TvService after resuming.
But the question is, why the TVservice produce these trouble.
somteimes after waking up from standby the screen of my TV is black until I hit a key, or move the mouse.
I have recognized, that every time the screen remains black, windows did NOT send the WM_POWERBROADCAST-Message (PBT_APMRESUMESUSPEND and/or PBT_APMRESUMEAUTOMATIC) after resuming. First when I hit a key, the WM_POWERBROADCAST messages arrived.
This behavior is only if the TVservice is running.
To avoid this problem I have wrote a small script which stops the TvService before the system is going to standby. And starting the TvService after resuming.
But the question is, why the TVservice produce these trouble.