Wayland and Xwayland mouse pointer stuttering #113684
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Reference: blender/blender#113684
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System Information
Operating system: Linux-6.5.6-100.fc37.x86_64-x86_64-with-glibc2.36 64 Bits, X11 UI
Graphics card: AMD Radeon RX 580 Series (polaris10, LLVM 15.0.7, DRM 3.54, 6.5.6-100.fc37.x86_64) AMD 4.6 (Core Profile) Mesa 23.0.3
DE: GNOME 43.9
Blender Version
Broken: ( Wayland ) version: 3.6.4, branch: blender-v3.6-release, commit date: 2023-09-25 13:24, hash:
21bfc5e7feBroken: ( Xwayland ) version: 3.6.4, branch: blender-v3.6-release, commit date: 2023-09-25 13:24, hash:
21bfc5e7feBroken: ( Wayland ) version: version: 3.6.5 Release Candidate, branch: blender-v3.6-release, commit date: 2023-10-12 12:38, hash:
521a68323cBroken: ( Xwayland ) version: version: 3.6.5 Release Candidate, branch: blender-v3.6-release, commit date: 2023-10-12 12:38, hash:
521a68323cBroken: ( Wayland ) version: 4.0.0 Beta, branch: blender-v4.0-release, commit date: 2023-10-12 18:54, hash:
1c4b2ad17fBroken: ( xWayland ) version: 4.0.0 Beta, branch: blender-v4.0-release, commit date: 2023-10-12 18:54, hash:
1c4b2ad17f,Worked: X11 /X.Org version: 3.6.4, branch: blender-v3.6-release, commit date: 2023-09-25 13:24, hash:
21bfc5e7feShort description of error
Mouse pointer stutters a lot on high GPU usage in Wayland and Xwayland ( WAYLAND_DISPLAY="" )
I recorder a video ( posted the gif ) of the Xwayland ( in the about panel you see X11 using Xwayland in a Wayland session) running Blender with WAYLAND_DISPLAY="" showing also "RadeonTop" ( same problem with Wayland ).
I tried also Blender in Full Screen, same problem.
No problem with X11.
Exact steps for others to reproduce the error
With similar system ( AMDGPU - Mesa - GNOME ) try to test any demo file with EEVEE and high GPU load.
During high GPU load, try to test and check the mouse pointer speed.
To underline the problem in the video i duplicated the demo assets and pressed "Play" to stress the GPU, then i tried to rotate the scene.
With Distro and Desktop environment switching to Wayland it could be a problem for a smooth pointer input experience in Blender ( even with Xwayland ).
Edit: maybe related to this issue:
https://gitlab.gnome.org/GNOME/mutter/-/issues/1833
It seems likely this issue isn't a bug in Blender.
Does this bug happen when the GPU is busy while the cursor is in a non-Blender window? If you play an animation with high FPS for e.g. does the cursor lag in other applications.
Does this happen with other Wayland compositors? (SWAY / RIVER / KDE or Weston).
If i stress the GPU without Blender running, for example opening multiple instances of 0A.D. game and glmark2 ( 100 % GPU usage ) the pointer is not lagging/stuttering.
While if Blender is running and with GPU 100 load, the lag is present on other non-Blender windows ( and all the system ).
In my limited experience in Wayland the bug is present only while Blender is running with 100% GPU load.
i prepared a gif in a Wayland session with 100% GPU load without Blender running ( no stuttering ).
Not tried other compositors for now but i can try to test other Distro, Desktop Environments and Compositors under Wayland as soon as possible.
Thank you.
I tried other tests:
After the GPU 100% load with other applications i tried to run Blender and i discovered that the pointer lag/stuttering is present only during calculations of the Material Preview / EEVEE ( in Wayalnd / Xwayland).
The pointer lag/stuttering is very evident during high load calculations of EEVEE under Wayland ( like in the first gif i posted ).
This stuttering bug is not present in X11 and EEVEE.
Since this happens both in Wayland & XWayland, the chance of this being a bug in Blender seem quite low, most likely this is https://gitlab.gnome.org/GNOME/mutter/-/issues/1833
Hello, just to notice that the problem is not solved even with GNOME/Mutter 5.3 Linux 6.7.4, Mesa 23.3.4.
I experienced this problem only when Blender is running with 100% GPU load under Wayland while i do not experience the same problem with other 3D apps/games running with 100% GPU load under Wayland.
I still can use X.Org for now.
There is a similar issue but in the #119190 case the problem seems related to Wayland only.
I gently ask to consider keep one of the two issues opened as the problem is not solved and it is not clear that it is only a compositor problem.
I experience the stuttering in Blender only and not in other 3D apps during heavy GPU loads.
Thank you.