GPU Passthrough and Linux guest freeze.


Aug 29, 2021
I have Clevo N957TC Laptop (i7 8700, 16Gb RAM, GTX1660ti max-q). I successfully install to this configuration ProxMox 7.1-12 and done GPU passthrought my NVIDIA video card. When i am using Windows as a guest - everything ok. This virtual machine works stable and well. When i do the same with Debian 11 as a guest with nouveau video driver, with the same setting of virtual machine - the Operation System is frozen. And Big problem to install proprietary driver for a NVIDIA video card, because i got the black screen. I tried the different - used the from NVIDIA site, used from repository - always black screen without cursor. Driver of nouveau works. When i add to GRUB at my virtual machine to line with GRUB_CMDLINE_LINUX_DEFAULT= parameter nouveau.noaccel=1, system become stable, but i need video acceleration for my software, i need OpenGL.

I tried Manjaro Linux, Garuda Linux, Deepin Linux, LinuxMint, Fedora 35 Gnome. Usually cursor of the mouse usually working and system freeze. This is not in constant time, sometimes it takes 1 hour or more, sometimes 1 min.

Console of my Debian 11 virtual machine :
dmesg | grep -i "error\|warn\|fail"
[ 597.275393] WARNING: ***: 3 PID: 69 at drivers/gpu/drm/nouveau/nvkm/engine/fifo/gk104.c:447 gk104_fifo_recover_engn+0x20a/0x220 [nouveau]
[ 597.275445] ghash_clmulni_intel drm_kms_helper virtio_net virtio_scsi net_failover failover ahci cec libahci aesni_intel libaes crypto_simd drm xhci_pci cryptd xhci_hcd glue_helper uhci_hcd ehci_pci ehci_hcd psmouse i2c_i801 libata i2c_smbus scsi_mod usbcore virtio_pci virtio_ring virtio lpc_ich usb_common button

Virtual machine settings with Debian 11:
agent: 1
args: -cpu 'host,+kvm_pv_unhalt,+kvm_pv_eoi,hv_vendor_id=willitwork,kvm=off' -object 'input-linux,id=kbd,evdev=/dev/input/event4,grab_all=on,repon,repeat=on'
balloon: 0
bios: ovmf
boot: order=scsi0;ide0
cores: 6
cpu: host,hidden=1,flags=+pcid
efidisk0: local-lvm:vm-901-disk-0,size=4M
hostpci0: 01:00,pcie=1,x-vga=on
ide0: none,media=cdrom
machine: pc-q35-5.1
memory: 10240
name: DebianVM
net0: virtio=5E:F2:F1:EA:DD:56,bridge=vmbr0,firewall=1
numa: 0
ostype: l26
scsi0: local-lvm:vm-901-disk-1,size=80G
scsihw: virtio-scsi-single
smbios1: uuid=2acf86a2-2cab-4581-8fd1-0bfe0a41d460
sockets: 1
usb0: host=1-4,usb3=1
usb1: host=1-3,usb3=1
vga: none
vmgenid: 3e09a013-55af-4d86-88f7-3148f3dda8b5

grub at the host:
GRUB_CMDLINE_LINUX_DEFAULT="quiet intel_iommu=on"

/etc/modprobe.d/blacklist.conf at the host:
blacklist radeon
blacklist nouveau
blacklist nvidia
Last edited:
Specific Nvidia chips with Nouveau may give random system lockups and more commonly throw many kernel messages, seen with dmesg. Try adding the nouveau.noaccel=1 kernel parameter. See Fedora:Common kernel problems#Systems with nVidia adapters using the nouveau driver lock up randomly for more information.

As an alternative you can also use the QT_XCB_FORCE_SOFTWARE_OPENGL=1 environment variable to disable OpenGL acceleration in Qt applications.

Looks like i have problems with OpenGL acceleration in Qt applications. Is it possible to fix this?


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