Note: Disable laptop screen when lid is closed
Actually, my laptop internal monitor was offing well a while ago. but after update Windows to build 26020, everything broken.
The internal monitor doesn't off anymore! Even the lid is close, mouse cursor still could be going to deep dark space, and it bothers clam-shelling by just moving the cursor left.
Normally, Windows should disconnect internal monitor when the lid is close, like while DP monitor turns off. My control panel power plan config is ok.
I found "LidAlwysOpen" registry value. But I tried my 4 monitor keys, and nothing changed.
Maybe some application is preventing it, like PowerToys Awake. but I does not installed applications particular around 26020.
One thing, cable is susceptible. I recently change a monitor cable, HDMI-HDMI-DVI converter to HDMI-DVI. Could these cause problem? But to be true that, my other 3 monitors only connected by C or Wi-Fi should be working normally, wouldn't?