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tuner card passthrough problem

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Proxmox < Debian 11 < Docker/Portainer
Machine q35, UEFI Bios

I have an Hauppauge HVR-2250.
iommu=on is set
VM has the pcie device added.

If the server (Proxmox) is freshly started, when the VM is started, the card is discovered and seems to be in working order:

Code:
root@debianq35:~# dmesg | grep saa7164
[    3.378991] CORE saa7164[0]: subsystem: 0070:8851, board: Hauppauge WinTV-HVR2250 [card=7,autodetected]
[    3.379006] saa7164[0]/0: found at 0000:01:00.0, rev: 129, irq: 16, latency: 0, mmio: 0xc1000000...

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