I switched to Manjaro because it's KDE based, and last time I checked, Houdini preferred to live under KDE for some elements of /stage, for example: dragging textures or objects in Stage Manager / Material Linker wasn't working correctly, it was extremely lagging, making them unusable, under some Gnome desktop (Linux Mint)
Now running under KDE, those problems are absent, but some other problems have appeared, which are even worse: the mouse wheel is no longer working in some UI elements; I noticed it first in the File dialog;
It sometimes also gets much worse; polydoctor SOP gets instantly corrupted, to the point that I cannot even delete it and drop another one; sometimes also random nodes get their parameters pane corrupted with one mouse wheel event.

As a data point, I also tried this on a less powerful, but more recent workstation with a non NVIDIA card, namely a: Radeon Pro WX7100; and those problems don't exist; It's basically the same Linux installation, except for the video card that is an AMD one.

I know that the mouse wheel events are not consumed by something between Houdini and the mouse device, because some UI elements work correctly, typically the 3D views always work, and they are clearly received by the parameter pane, because this is what is causing the corruption.

Can someone give me an example of a setup which currently works ? Logic tells me it's related to: nvidia v: 580.105.08


Problematic setup:


Graphics:
Device-1: NVIDIA AD106 driver: nvidia v: 580.105.08
Display: wayland server: X.org v: 1.21.1.20 with: Xwayland v: 24.1.9
compositor: kwin_wayland driver: X: loaded: nvidia
gpu: nv_platform,nvidia,nvidia-nvswitch resolution: 2560x1440~60Hz
API: EGL v: 1.5 drivers: nvidia,swrast
platforms: gbm,wayland,x11,surfaceless,device
API: OpenGL v: 4.6.0 compat-v: 4.5 vendor: nvidia mesa v: 580.105.08
renderer: NVIDIA GeForce RTX 4060 Ti/PCIe/SSE2
API: Vulkan v: 1.4.328 drivers: nvidia surfaces: N/A
Info: Tools: api: clinfo, eglinfo, glxinfo, vulkaninfo
de: kscreen-console,kscreen-doctor gpu: nvidia-settings,nvidia-smi
wl: wayland-info x11: xdpyinfo,xprop



Houdini FX Version 21.0.512

Open Source Information: https://www.sidefx.com/docs/houdini/licenses/index.html [www.sidefx.com]

Operating System: Manjaro Linux
Processor: Intel(R) Xeon(R) CPU E5-2690 v4 @ 2.60GHz
Number of Cores: 56
Physical Memory: 125.79 GB
Number of Screens: 1
Screen 0: 2560 x 1440 at 0,0
Work Area 0: 2560 x 1396 at 0,0
Screen 0 DPI: 108.9

Platform Build: linux-x86_64-gcc11.2
Python Version: 3.11
Qt Version: 6.5.3
USD Version: 25.05
USD git URL: https://github.com/sideeffects/USD.git [github.com]
USD git Revision: 4a631cd4a7549f6cc18b264b4cee940e8492985a
UI Scale: 1.000

Detected GPU: NVIDIA Consumer
16380 MB
580.105.8.0


Vulkan Vendor: NVIDIA Corporation
Vulkan Device: NVIDIA GeForce RTX 4060 Ti
Vulkan Version: 1.4.312
Vulkan Loader Version: 1.3.236
Device Heaps: 16380 MB + 246 MB
Queue Families: 16 G|C|T|S
2 -|-|T|S
8 -|C|T|S
1 -|-|T|S
1 -|-|T|S
1 -|-|T|S

Also, the problems disappear on that machine using the Qt5 version:


Houdini FX Version 21.0.440

Open Source Information: https://www.sidefx.com/docs/houdini/licenses/index.html [www.sidefx.com]

Operating System: Manjaro Linux
Processor: Intel(R) Xeon(R) CPU E5-2690 v4 @ 2.60GHz
Number of Cores: 56
Physical Memory: 125.79 GB
Number of Screens: 1
Screen 0: 2560 x 1440 at 0,0
Work Area 0: 2560 x 1396 at 0,0
Screen 0 DPI: 108.9

Platform Build: linux-x86_64-gcc11.2
Python Version: 3.11
Qt Version: 5.15.2
USD Version: 25.05
USD git URL: https://github.com/sideeffects/USD.git [github.com]
USD git Revision: d687c15dd305b6eb9341df89596f6ac721562403
UI Scale: 1.000