updated to PVE 9.0 then GPU passthrough stopped working on Windows

Tried all the previous kernels on my system but nothing fixes error 43, I really have no idea what changed.
 
LongQT-sea said:
@JonSnow Try this brother: https://github.com/LongQT-sea/intel-igpu-passthru
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Tried your rom file too.. (thank you for putting in the effort by the way)
args: -set device.hostpci0.bus=pci.0 -set device.hostpci0.addr=2.0 -set device.hostpci0.x-igd-opregion=on
hostpci0: 0000:00:02.0,romfile=igd.rom

Windows boots, but still
Windows has stopped this device because it has reported problems. (Code 43)

that was with Coffee/Comet Lake (8/9/10th gen) rom file since I have a i3-10100T CPU


Reading the issue#15 I installed latest UHD graphics driver available for the gpu - 8/28/2025 from https://www.intel.com/content/www/u...essor-graphics/intel-uhd-graphics-family.html still same issue.
 
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LongQT-sea said:
@adystech As long as you meet the Requirements and use legacy mode passthrough, it will work.

Edit: Windows VM must use OVMF/UEFI boot.
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sir, you are a life saver!!
I had not tried the legacy part before,, So I went from
hostpci0: 0000:00:02.0
localtime: 1
machine: pc-q35-10.0
vga: std,memory=512

to
hostpci0: 0000:00:02.0,legacy-igd=1,romfile=igd.rom
localtime: 1
machine: pc-i440fx-10.1
vga: none

Now my Windows 11 VM boots, and works.. Thank you so much!!
1765764785354.png
 
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JonSnow said:
Still hoping for a fix that does not require these workaround, since this worked for years until recently.
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You’re referring to this as a "workaround" ?

QEMU provides official documentation for passthrough Intel iGPU with OpROM via vfio, and it also has dedicated source code (igd.c) specifically for Intel iGPU passthrough. Given that, it seems more like a supported feature than a "workaround".

The official docs also includes instructions on how to extract and create the OpROM.
 
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LongQT-sea said:
You’re referring to this as a "workaround" ?

QEMU provides official documentation for passthrough Intel iGPU with OpROM via vfio, and it also has dedicated source code (igd.c) specifically for Intel iGPU passthrough. Given that, it seems more like a supported feature than a "workaround".

The official docs also includes instructions on how to extract and create the OpROM.
Click to expand...
It is a supported feature, but this is a workaround because none of these steps were required until recently, it just worked.

Now if this is the official way forward and all previous methods are obsolete, then this is the way it is.
 
Wanted to report I still could not get rid of error 43, even with @LongQT-sea rom or my own extracted roms on an existing 8.4 install after trying both methods. I had windows installed on another computer, so decided to take an image of it and then installed pve 9.1. Once i restored my windows image, everything worked, no rom needed. However as soon as I went to update the igpu drivers I got error 43 once again.
 
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