Pen pressure not detected by Blender on Hyprland

[Demigirlboss]

Hyprland Version

Hyprland, built from branch main at commit 2997022 dirty (nix: override libdrm to use newer version (4003)). Tag: v0.32.3-95-g29970228

Bug or Regression?

Bug

Description

System Information
Operating system: Linux-6.5.9-arch2-1-x86_64-with-glibc2.38 64 Bits, WAYLAND UI
Graphics card: AMD Radeon RX 6600 XT (navi23, LLVM 16.0.6, DRM 3.54, 6.5.9-arch2-1) AMD 4.6 (Core Profile) Mesa 23.2.1-arch1.2

Short description of error
[Originally posted here] Blender does not detect pen pressure for brush intensity in the Hyprland compositor. It only detects pen pressure for brush radius. It detects it in KDE Plasma running on Wayland, and on KDE Plasma or Budgie running on X11. Issue presents in sculpting and texture painting. Issue does not present in Krita or in this online pen pressure test. OpenTabletDriver debugger detects pen pressure levels without issue. Issue persists with both OpenTabletDriver and Linux kernel driver. Tablet is Wacom CTL-672.

How to reproduce

Exact steps for others to reproduce the error
Attempt to perform any sort of sculpting or texture painting task which employs pen pressure while using the Hyprland Wayland compositor with this configuration. Unknown if issue persists in other configurations as well. No pen pressure will be detected. Essentially, identical to using a mouse.

Crash reports, logs, images, videos

system-info.txt

[vaxerski]

isn't this a blender issue then?

I don't have any tablets

[Demigirlboss]

It might be seen as a Blender issue, given that it only occurs in Blender. But it might also be seen as a Hyprland issue, given that it only occurs on Hyprland, and not on other compositors, like Weston. As such, I have filed reports on both relevant trackers. If nothing else, other people facing the issue can feel a little less insane than I did looking for reports of the issue and finding none.

[vaxerski]

does it work on sway-git?

[Demigirlboss]

I can't seem to get sway-git to play nice with Hyprland and Plasma, so I'm unable to test this. However, the following was commented by maintainer Campbell Barton on the Blender bug tracker report for this issue:

This bug should be reported to hyperland, checking their tablet support and it looks to be incomplete, as of 9ca0c7d the tablet time-stamps are always zero and the radius scale is erratic. There are also TODO's noted in src/managers/input/Tablets.cpp that hint that this is work in progress.

[calebaden]

I also have this issue and just tested with Sway 1.8.1-4 from the arch repo (non git) and it works as expected. Using pen pressure correctly varies the strength of the brush in sculpt mode on Blender 4.0.2-4.
In Hyprland 0.33.1-2, the pen pressure does not work on the strength attribute at all (always at maximum strength) and while the radius does work, it is not as smooth/gradual as I would expect.
Using pen pressure on Krita with Hyprland works just fine.

[vaxerski]

drawing tablet support on hyprland is spotty indeed, I don't have a tablet to test and thus rarely focus on the code.

I can check the timestamps and radius code tho, remind me tomorrow please

[Demigirlboss]

I just logged on to GitHub for an unrelated tablet issue and saw this, so I guess here's the reminder to check timestamps and radius code!

[SquishyLizard]

Experiencing the same problem here.
Was surprised to see my tablet and touch work so flawlessly with most things in Hyprland, as it is a bit odd at times.
Blender has been the only issue so far, all the other stuff works even better than on Windows, even though being made for that.
Hoping to see this being resolved, anybody have a duct-tape solution?

Thanks for such a great experience using Hyprland, truly

[DNACFRA]

Hey, did some (maybe helpful)testing with Blender ran over Wine or Steams Proton runtime
I want to start with the info that both are probably not really usable, as they crash on things like adding a Subdivision Modifier
But:

• Steams Proton running Blender also doesn't have working pressure like hyprland
• Wine works completely with pressure and even fixing the drag Problems, that are referenced in Not being able to drag sliders on blender with pen tablet #3468 when using a pen, the mouse drag does not work

Notes:

• This was done with factory settings Blender, so there might be a difference in how Steams Proton and Wine use the Windows Tablet API(Windows Ink vs Wintab).
• No manual changes were done to Wine, maybe it can be made usable as duct-tape-solution

(Hope this helps)

[Agent00Ming]

Please check latest git. This works for me after #5902