Idle detection doesn't restore brightness after monitor switches back on

[FreddieDev]

Steps:

1. Go idle
2. Idle detection dims monitor
3. Computer eventually turns off monitor
4. Awake the screen (move mouse, tap key on keyboard)
5. Idle detection fails to un-dim monitor

I'm unsure if this can be reproduced with the Windows monitor shutdown. In my case, I'm using AutoHotkey to switch off the display using: SendMessage 0x112, 0xF170, 2, , Program Manager