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ASUS Prime X370-Pro vs QEMU/Passthrough, latest BIOS updates don't work


Hi Everyone,

Below are basically information I would like to share with you all.

I tried upgrade BIOS to latest 4801 and I did instantly regretted that.
The latest 4801 and 4602 don’t work with QEMU/Passthrough - kernel panic or freeze every restart/shutdown.

If you try to downgrade BIOS from latest 4801 it’s not possible using official BUpdater or EZ BIOS update utility as both do not allow downgrade.

I used old AMI update tool “afudos 4406.cap /x /p /b /n /k” and it worked fine.
I found downgrading method this reddit article in the comments:

old post:
Recently I’ve build new PC on AMD 2600 on ASUS Prime X370-Pro and two Nvidia PCIex cards. Obviously I’ve updated BIOS to (then) latest version 4602.
PC worked just fine on Windows and Linux except running QEMU with passthrough PCIex card or USB controller. System/kernel was crashing every time on reboot, when I’ve tried to run VM.
Situation resolved then BIOS downgrade to earlier version 4406. Everthing worked fine after downgrade.
Today I’ve noticed new BIOS version 4801 and I wonder if anyone using Linux/QEMU/Passthrough tried it already?

Kind Regards



Hello Thom,

I Still run Leap42, but with the Stable kernel 5.1, meaning I have to patch Vmware 15.1 for that ( thks rglinux and Michal Kubeček for this).

I am running Bios 4602 since a couple of weeks, and it stable with Vmware player 15.1 (patched) for my virtual machines, no freeze so far.

Can you give more details about your linux and kernel versions ? not sure i can help , but i, am interested.

i do not use Qemu in passthrough yet, but I follow Wendel vids about this and I seem to remember that there where some problems when the video cards are of the same models and that a cold reboot was required for the firmware load ( but this was a while ago BIOSes and kernel have evolved to better support Ryzen)

also with new ryzen2 support which is in the latest BIOSes, some side stabiliy effects could be (y)our problem :wink:





Hi Dominique,

I’m using Manjaro KDE, with kernel 5.0.15 at the moment, waiting 5.1 to mature a little bit.

If I recall correctly problematic are AMD cards in my case both are nvidia, and both work fine with older bios so no reset problem here.

Kind regards