[SOLVED] Problem when using HDMI port on laptops

Hi all,

I have two old laptops with proxmox installed in both of them, working fine with VMs, LXCs, etc...
I bought a small kvm switch to work with both of the laptops with only 1 hdmi video screen, mouse and keyboard when I need to access them directly when boot fails or anything else I can't do via SSH for example.
They problem is when I try to use it, no image is displayed on the hdmi screen. I want to use this only for the proxmox hosts/servers. I don't want to passtrough anything to...

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