Video issues with Windows 11

[juliotux]

I noticed some video glitches on Windows 11, using QXL+Spice and virtio-win drivers, version 0.1.208. They appear just when presenting a PowerPoint in a Teams meeting. They didn't occur in Windows 10.

[6-dehan]

Hi Juliotux, there is a question for you, how did you use virtio-win driver, I mean just like "virtio-vga/viogpudo + spice"?

[juliotux]

Hi @6-dehan , I'm using a VM with QXL graphics and Spice video and installing all the drivers from virtio-win iso. It's a very standard machine for Windows.

[zhguo01]

@juliotux So far I'm not able to reproduce this issue on my env, my env:

packages used: spice-server-0.14.3-4 qemu-kvm-ui-spice-6.1.0-4 qemu-kvm-6.1.0-4 libvirt-7.8.0-1 virt-viewer-9.0-11

VM: windows 11 with latest update(update date: 11/4/2021) qxl driver version: 10.0.0.21000 VM desktop resolution is 1920x1080

My qemu cli: /usr/libexec/qemu-kvm
-name guest=win11,debug-threads=on
-S
-object '{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain-1-win11/master-key.aes"}'
-blockdev '{"driver":"file","filename":"/usr/share/edk2/ovmf/OVMF_CODE.secboot.fd","node-name":"libvirt-pflash0-storage","auto-read-only":true,"discard":"unmap"}'
-blockdev '{"node-name":"libvirt-pflash0-format","read-only":true,"driver":"raw","file":"libvirt-pflash0-storage"}'
-blockdev '{"driver":"file","filename":"/var/lib/libvirt/qemu/nvram/win11_VARS.fd","node-name":"libvirt-pflash1-storage","auto-read-only":true,"discard":"unmap"}'
-blockdev '{"node-name":"libvirt-pflash1-format","read-only":false,"driver":"raw","file":"libvirt-pflash1-storage"}'
-machine pc-q35-rhel8.5.0,accel=kvm,usb=off,vmport=off,smm=on,dump-guest-core=off,pflash0=libvirt-pflash0-format,pflash1=libvirt-pflash1-format,memory-backend=pc.ram
-cpu EPYC-Rome,x2apic=on,tsc-deadline=on,hypervisor=on,tsc-adjust=on,spec-ctrl=on,stibp=on,arch-capabilities=on,ssbd=on,xsaves=on,cmp-legacy=on,ibrs=on,amd-ssbd=on,virt-ssbd=on,svme-addr-chk=on,rdctl-no=on,skip-l1dfl-vmentry=on,mds-no=on,pschange-mc-no=on,hv-time,hv-relaxed,hv-vapic,hv-spinlocks=0x1fff,hv-vpindex,hv-runtime,hv-synic,hv-stimer,hv-stimer-direct,hv-reset,hv-frequencies,hv-reenlightenment,hv-tlbflush,hv-ipi
-global driver=cfi.pflash01,property=secure,value=on
-m 16384
-object '{"qom-type":"memory-backend-ram","id":"pc.ram","size":17179869184}'
-overcommit mem-lock=off
-smp 4,sockets=1,dies=1,cores=4,threads=1
-uuid d97baf54-cfda-40c4-a605-71018977bd9a
-no-user-config
-nodefaults
-chardev socket,id=charmonitor,fd=38,server=on,wait=off
-mon chardev=charmonitor,id=monitor,mode=control
-rtc base=localtime,driftfix=slew
-global kvm-pit.lost_tick_policy=delay
-no-hpet
-no-shutdown
-global ICH9-LPC.disable_s3=1
-global ICH9-LPC.disable_s4=1
-boot strict=on
-device pcie-root-port,port=0x10,chassis=1,id=pci.1,bus=pcie.0,multifunction=on,addr=0x2
-device pcie-root-port,port=0x11,chassis=2,id=pci.2,bus=pcie.0,addr=0x2.0x1
-device pcie-root-port,port=0x12,chassis=3,id=pci.3,bus=pcie.0,addr=0x2.0x2
-device pcie-root-port,port=0x13,chassis=4,id=pci.4,bus=pcie.0,addr=0x2.0x3
-device pcie-root-port,port=0x14,chassis=5,id=pci.5,bus=pcie.0,addr=0x2.0x4
... -chardev spicevmc,id=charchannel0,name=vdagent
-device virtserialport,bus=virtio-serial0.0,nr=1,chardev=charchannel0,id=channel0,name=com.redhat.spice.0
-tpmdev emulator,id=tpm-tpm0,chardev=chrtpm
-chardev socket,id=chrtpm,path=/run/libvirt/qemu/swtpm/1-win11-swtpm.sock
-device tpm-tis,tpmdev=tpm-tpm0,id=tpm0
-device usb-tablet,id=input0,bus=usb.0,port=1
-audiodev id=audio1,driver=spice
-spice port=5900,addr=0.0.0.0,disable-ticketing=on,image-compression=off,seamless-migration=on
-device qxl-vga,id=video0,ram_size=67108864,vram_size=67108864,vram64_size_mb=0,vgamem_mb=16,max_outputs=1,bus=pcie.0,addr=0x1
-device ich9-intel-hda,id=sound0,bus=pcie.0,addr=0x1b
-device hda-duplex,id=sound0-codec0,bus=sound0.0,cad=0,audiodev=audio1
-chardev spicevmc,id=charredir0,name=usbredir
-device usb-redir,chardev=charredir0,id=redir0,bus=usb.0,port=2
-chardev spicevmc,id=charredir1,name=usbredir
-device usb-redir,chardev=charredir1,id=redir1,bus=usb.0,port=3
-device virtio-balloon-pci,id=balloon0,bus=pci.4,addr=0x0
-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny
-msg timestamp=on

I have tried:

1. play a YouTube video in window mode and full screen mode
2. present an office 365 slide via a meeting from teams pre-installed by windows 11

For now I don't see any video flickers in my tests.

So my questions:

1. The packages you used?
2. Your qxl driver version and desktop resolution?
3. Are you only experiencing video flicker when presenting office 365 slide via teams meeting?
4. Can you attach a picture or a small video to show this video flicker?

Thanks!