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No signal to HDMI with pass-thru GPU after upgrading to 6.9.2

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I have seen a few other posts about this, but nothing that was said there has fixed this for me. I have a GPU that I need to pass-thru to a VM. The device shows up in the PCI list (under Linux)/Device Manager (under Windows), but I get no signal out the HDMI port.

Things I have already checked/tried:
0) I have confirmed the GPU, monitor, and HDMI cable all work when swapped to bare-metal devices, and this setup was working fine until I upgraded to 6.9.2.

1) I have tried switching OSes from Linux to Windows

2) I have tried switching "Machine" type; I have tried every version of both machine types under both OSes

3) I have confirmed that the GPU and its associated sound device are part of an otherwise-isolated IOMMU group and have tried both with and without having that IOMMU group being assigned to VFIO at boot.

4) I have tried both SeaBIOS and OVMF

5) I have tried using SpaceInvaderOne's vbios dump script, it always generates an error, even with Docker and VMs disabled. (See https://pastebin.com/ejFpvmPi for output); I have done as suggested in the video and rebooted the machine with the GPU bound to VFIO at boot, to no avail.



Any ideas or suggestions would be appreciated; Without this HDMI port working, we are unable to monitor our surveillance camers in realtime.



Loading config from /boot/config/vfio-pci.cfg
BIND=0000:02:00.0|10de:1d01 0000:02:00.1|10de:0fb8
Processing 0000:02:00.0 10de:1d01
Vendor:Device 10de:1d01 found at 0000:02:00.0

IOMMU group members (sans bridges):

Successfully bound the device 10de:1d01 at 0000:02:00.0 to vfio-pci
Processing 0000:02:00.1 10de:0fb8
Vendor:Device 10de:0fb8 found at 0000:02:00.1

IOMMU group members (sans bridges):

0000:02:00.0 already bound to vfio-pci
0000:02:00.1 already bound to vfio-pci
Successfully bound the device 10de:0fb8 at 0000:02:00.1 to vfio-pci
vfio-pci binding complete

Devices listed in /sys/bus/pci/drivers/vfio-pci:
lrwxrwxrwx 1 root root 0 Sep 5 17:22 0000:02:00.0 -> ../../../../devices/pci0000:00/0000:00:02.0/0000:02:00.0
lrwxrwxrwx 1 root root 0 Sep 5 17:22 0000:02:00.1 -> ../../../../devices/pci0000:00/0000:00:02.0/0000:02:00.1

ls -l /dev/vfio/
total 0
crw------- 1 root root 249, 0 Sep 5 17:22 33
crw-rw-rw- 1 root root 10, 196 Sep 5 17:22 vfio


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6 hours ago, technorati said:

5) I have tried using SpaceInvaderOne's vbios dump script


So, you are running it with a vbios or not?

Sometimes missing output to video ports depends on wrong vbios.

I would say it's mandatory to use a vbios dumped from your gpu, so if you're running your vm with a vbios, you need to find a way to dump it from your gpu.

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