I just realized that when rebooting Proxmox the GPU outputs host boot info to the display, the last lines being
[ OK ] Reached target graphical.target - Graphical Interface.
Starting systemd-update-utmp-runlevel.service - Record runlevel Change in UTMP...
[ OK ] Finished...
Thanks! That seems to have solved the booting issue, and I can now see the GPU in Debian using lspci.
There's no HDMI output from the GPU, however, and no combination of "Primary GPU", "All Functions" and "PCI-Express" in the PCI Device GUI followed by a VM reboot seems to mitigate that. Also...
I feel like I've tried most PCI passthrough guides now, with dwindling luck. My setup is this:
CPU: AMD Ryzen 7 7700X
Motherboard: ASUS PRIME B650M-A WIFI
GPU: ASUS Dual Radeon RX 7600 V2 OC
After giving up on Windows as a VM for remote gaming and other GPU-heavy stuff, I supposed I'd try my...
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