I have a Sky box connected to the HDMI  1 ARC input and occasionally a Laptop connected to the HDMI 2 Input.

With the laptop switched off the tv auto finds the Sky box which is fine. If I then power up the laptop and use the remote to select HDMI 2 I see the laptop output. If I then select HDMI 1 on the remote I still get the laptop output on HMDI 1. I have tried having both sources switched on before swithcing on the TV. The only way to see the SKY box is the switch off the TV and switch it back on, select HDMI 1 the Sky output is available. I then find I have the Sky box input on both HDMI inputs while the laptop was on so not able to see the laptop output. I have changed leads, swopped the inputs with the same results  Changed input settings to Auto.

 Any help appreciated

Ken