Thanks, but still no :(
root@pve:~# more /etc/modprobe.d/vfio.conf
options vfio-pci ids=8086:3a20,8086:3a26
softdep ata_piix pre: vfio-pci
softdep pata_acpi pre: vfio-pci
After update-initramfs -u and reboot, its unchanged:
root@pve:~# lspci -k -s 00:1f
00:1f.0 ISA bridge: Intel Corporation...