Monitor stays blank after switching KVM back to FreeBSD computer

distro_dave

I have FreeBSD 13.1 installed, with integrated Intel graphics (an Intel NUC). I've tried with and without ACPI video support, with the Intel graphics driver, and with the NVidia graphics driver (it has two cards) - whenever I switch away from the machine to the other via KVM, then switch back, the monitor stays blank. I can access the machine via SSH so it's still up. This happens both when I'm using X, and when I've just boot into the console....

Originally asked by Ken - Enough about Monica on Stack Exchange (unix) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

I can't tell from your comment what Desktop Environment you are running, but I would guess it is Plasma as Gnome based DE are far less sensitive to hardware issues. I was running into a similar issue, I have a MacBook with the built-in HDMI port going to a DP adapter, and one of the USB-C outputs to DP. Those go to a KVM that my Linux Desktop (Ryzen 5-2600, Nvidia 1660 TI) is also connected to. On the Linux Box side, it has a DP connector going straight to the KVM and the HDMI port going to a DP adapter to the KVM. When I was running Gnome (and several other DE) switching the KVM produce no ill effects. But with Plasma on several distros, when I switched the KVM the result was the HDMI-> DP...

Full answer by Morris Buel: https://unix.stackexchange.com/a/787709 (CC BY-SA 4.0).

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