Glitchy texts and strange lines. Only on GPU-passthrough'd Windows VMs.

[sausagewaterson]

Hi there,

 

on my newest unraid-system it is simply not possible for me to use the GPU error-free in a Windows VM. Pop_OS! or any other Linux-VM is working flawlessly. When I install Windows 10 or 11 directly onto this system, everything is error-free and smoothly usable.
Sometimes the described stripes/lines and texts are right after bootup, sometimes they appear after three or four minutes.

Windows EventViewer shows nothings interessting. New installations (Unraid/OS/Drivers/..) do not improve the situation.

 

Maybe someone in here has a solution for me. Thanks in Advanced.

 

Examples:

Spoiler

 

The System:

CPU: Intel® Core™ i5-7500T CPU @ 2.70GHz

Mainboard: Gigabyte Technology Co., Ltd. Z170X-GamingG1; BIOS Version F22j

GPU-1: KFA2 GeForce® GTX 1050 Ti OC 4GB [04:00.0-10de:1c82] ( < the one we are talking about.)

GPU-2: NVIDIA T400 [03:00.0]

RAM: 32GB @ 2133MHz

Unraid Version: 6.9.2
Libvirt Version: 6.5.0

QEMU Version: 5.1.0

PCIe ACS override: Both. 

 

DIAGNOSTICS:

 

tower2-diagnostics-20220320-0943.zip

 

tl;dr: In all WIndows-VMs is my GPU super weird. Random appearing white or black lines. Bare-Metal Install -> All fine. Different Cabels, Install-images, Drivers nor vBIOS changes anything. Any idea to fix this?

[ghost82]

I would try to switch from i440fx to q35.

You can create a new q35-5.1 vm (ovmf) pointing to actual vdisk, so no need to reinstall windows.

[sausagewaterson]

sorry for my late anwser.

this is something i did very early on. always resulting in the classic error 43 or a black screen.

BUT this time:

on this morning, on ifx, turned the vm off very early on so no "proper" gpu-drivers could be installed.

changed it to q35. it starts, installs the windows default drivers. no errors so far.

started ddu and removed every driver imaganable.

rebooted, installed the newest nvidia drivers followed by a reboot.

so far this looks good. stable, no glitchy errors.. 

 

i have the feeling it depends on when you redo/unistall your drivers. but idk. 

anyways, thanks for making me do this again. but worked this time.

 

thanks. THANK YOU VERY MUCH!