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Re:Looking Glass: Run a Windows VM on Linux in a window with... by sm_ts on Sunday July 18, 2021 @04:46AM (#27871589)
> 2. The passed-through card must have a monitor connected.

Regarding this, I don't know about LG, but with a standard QEMU VFIO setup, one use a single monitor connected to the two cards, and switch the input when required.

Re:Looking Glass: Run a Windows VM on Linux in a window with... by gnif on Sunday July 18, 2021 @05:32AM (#27871702)
Yup, this is a good option too, makes it easy to debug/diagnose when things go wrong with the guest VM too.

Just note that not all multi-input monitors are equal though, a small minority appear to the GPU as unplugged when the input selection is changed.