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I had the same problem, the solution I found is to move the mouse : mouse_event(MOUSEEVENTF_MOVE, 0, 1, 0, NULL); Sleep(40); ...

The new power mode works differently to the normal S1-S4 power states. Power saving starts when the display turns off and is transparent to applications.

Simple utility that, when launched, sends a WM_SYSCOMMAND window message with the SC_MONITORPOWER parameter to turn off the screen.

然後代入SC_MONITORPOWER這個參數來設定顯示狀態，設定值如下面描述。 SC_MONITORPOWER. -1 (開啟螢幕); 1 (讓螢幕處於低耗電量); 2 (關閉螢幕).

Can anyone think why a device would lock whilst in use? This is happening when connected to a monitor and whilst just working from the laptop.

I'm trying to detect when windows powers off/on the monitor because of display sleep settings. (Settings -> System -> Power & Sleep -> Screen)

On my desktop machine (Win 10), this works perfectly. However, on my laptop (Win 10), it causes the laptop to reboot.

系统正在进入连接待机状态原因: SC_MONITORPOWER。 电脑总是出现下面的事件，导致我用着电脑时，突然黑屏几秒后出现屏保，需要重新登录。

Bluetooth devices do have problems that may fail to wake up. It may be caused by the power supply problem of Bluetooth device.