windows-screen-suspender.ps1

$objWMi1 = get-wmiobject -namespace root\WMI -computername localhost -Query "Select * from WmiMonitorConnectionParams"

function Set-Lid-Configuration {
    
    if ($objWMi1.Count -lt 2) { # Without external monitors
        powercfg -setacvalueindex 381b4222-f694-41f0-9685-ff5bb260df2e 4f971e89-eebd-4455-a8de-9e59040e7347 5ca83367-6e45-459f-a27b-476b1d01c936 1
        powercfg -setdcvalueindex 381b4222-f694-41f0-9685-ff5bb260df2e 4f971e89-eebd-4455-a8de-9e59040e7347 5ca83367-6e45-459f-a27b-476b1d01c936 1
    } else { # With external monitors
        powercfg -setacvalueindex 381b4222-f694-41f0-9685-ff5bb260df2e 4f971e89-eebd-4455-a8de-9e59040e7347 5ca83367-6e45-459f-a27b-476b1d01c936 0
        powercfg -setdcvalueindex 381b4222-f694-41f0-9685-ff5bb260df2e 4f971e89-eebd-4455-a8de-9e59040e7347 5ca83367-6e45-459f-a27b-476b1d01c936 0
    }
}

Set-Lid-Configuration # Initial configuration

while($true) {
    Start-Sleep -s 5
    $objWMi2 = get-wmiobject -namespace root\WMI -computername localhost -Query "Select * from WmiMonitorConnectionParams"

    if ($objWMi1.Count -ne $objWMi2.Count) {
        $objWMi1 = $objWMi2
        
        Set-Lid-Configuration
    }
}