Tearing when windows are resized

[DemiMarie]

How to file a helpful issue

Qubes OS release

R4.1

Brief summary

When a window is resized quickly, tearing will sometimes happen. Reproducing the problem is difficult, as the problem is intermittent.

Steps to reproduce

Quickly resize a window, such as a terminal window. The bug will not always trigger.

Expected behavior

No tearing

Actual behavior

Tearing

[DemiMarie]

There is a FreeDesktop specification that can help, if I recall correctly.

[jamke]

I have similar in R4.1.1 all the time. Any resize of a window causes tearing and glitches, but after resize is finished - it's OK again.
Intel iGPU of 11-gen i7.
The tearing and flashing glitches during resizing process are visible only inside the resized window.

[DemiMarie]

This is a known problem with the GUI protocol. Fixing it requires the GUI daemon to tell the agent to resize, and defer the actual resize until the agent has rerendered the window. @marmarek is this something you are okay with?

[jamke]

In my case I solved almost all tearing, glitches and artifacts problems with these 3 steps:

1. Adding kernel parameter i915.enable_psr=0: https://wiki.archlinux.org/title/Intel_graphics#Screen_flickering
2. Creating 20-intel.conf with TearFree option: https://wiki.archlinux.org/title/Intel_graphics#Tearing
3. Turning on the Compositor in the xfce settings. Without it I still had scrolling and video tearing.

Now I'm finally very comfortable with the video output of R4.1.

[Middenvaus]

i have the same issue after resizing the window several times I got tearing in almost all applications in other appvms. my hardware is amd with vega integrated graphic

i try to solve my problem by writing xorg config in /etc/X11/xorg.conf.d with next content:

Section "OutputClass"
        Identifier "AMD"
        MatchDriver "amdgpu"
        Driver "amdgpu"
        Option "TearFree" "true"
EndSection

@DemiMarie