I am using task scheduler to fire a program when someone logs in, unlocks the station, and I would like to do it when the screen turns back on prior to locking. IE the power savings turns off the screen at 5 minutes, lock happens at 15 minutes.
Which event would I register to capture the screen coming back on?
GetDevicePowerState sometimes works for monitors. If it's present, you can open the \.\LCD device. Close it immediately after you've finished with it.
Essentially, you're out of luck -- there is no reliable way to detect the monitor power state, short of writing a device driver and filtering all of the power IRPs up and down the display driver chain. And that's not very reliable either.
From a StackOverflow post found here.
