id = 2068
title = "Regression: 8.1.3 -> 8.2.0 breaks virtio vga driver"
state = "closed"
created_at = "2024-01-04T09:35:01.897Z"
closed_at = "2024-01-08T08:20:13.217Z"
labels = ["device:graphics", "device:virtio"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/2068"
host-os = "Arch Linux"
host-arch = "x86 64"
qemu-version = "8.2.0"
guest-os = "Arch"
guest-arch = "x86_64"
description = """I have a number of emulated arch linuxes using the same x11/kde configuration. After updating from 8.1.3 to 8.2.0, they all broke in the following way:
- screen tearing/artifacts seen from bios up until sddm
- sddm is possibly affected
- kde/x11 has so many artifacts that its unusable. if i attempt to write in a console window, i can only see parts of what ive written if i attempt to gently resize the bottom of the window. clicking the menu item will only render the menu 1/6 times and only partly. however if I click where I remember the shutdown button to be, the system shuts down immediately, so thi seems to be purely a graphics issue.
- starting with -vga qxl fixes all issues."""
reproduce = """1. make new qemu, install arch/kde
2. boot said qemu with -vga virtio option
3. observe issue from the moment it boots"""
additional = """Using nVidia card and drivers on host.

Removing x86-video-vesa on the guest system seemed to significant improve performance. There are still many artifacts but its almost usable with this driver removed."""