Send commands for switching HDMI input to TV when WMI events are triggered by KVM switch (connect/disconnect)

Register-KvmEvents.ps1

Register-WmiEvent -Query "SELECT * FROM __InstanceCreationEvent WITHIN 1 WHERE TargetInstance ISA 'win32_PNPEntity' AND TargetInstance.DeviceID like 'USB\\VID_045B&PID_0209%'" -SourceIdentifier KVMConnected -Action { lgtv --name MyTV --ssl setInput HDMI_4 }

Register-WmiEvent -Query "SELECT * FROM __InstanceDeletionEvent WITHIN 1 WHERE TargetInstance ISA 'win32_PNPEntity' AND TargetInstance.DeviceID like 'USB\\VID_045B&PID_0209%'" -SourceIdentifier KVMDisonnected -Action { lgtv --name MyTV --ssl setInput HDMI_3 }

If you know the name of your device you can obtain the DeviceID can be obtained by running:

Get-WmiObject win32_PNPEntity | where { $_.Name -eq "Generic USB Hub" }

$_.Caption may be used instead of $_.Name

You can also get all USB devices with InstanceIDs (which seem to be identical to DeviceID?) by running:

Get-PnpDevice -PresentOnly | Where-Object { $_.Class -eq 'USB' } | Format-Table -AutoSize

⚠This only works for as long as the console it is run from remains open, which is not ideal

There are ways to make the event subscription permanent

Further reading:

https://learn-powershell.net/2013/08/14/powershell-and-events-permanent-wmi-event-subscriptions/
https://learn.microsoft.com/en-us/windows/win32/wmisdk/commandlineeventconsumer

Simple AutoHotkey solution to run this script without needing to have a visible console window open: https://gist.github.com/alimbada/e5b43bb5df2a472fbc8bf7e24a7139d3