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Wacom Intuos 5S no pen pressure on Fedora 30
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Description

System Information
Operating system: Fedora 30 (5.1.20-300.fc30.x86_64)
Graphics card: SAPPHIRE - Radeon RX VEGA 64 Nitro+ - 8 Go

Blender Version
Broken: 2.80 (sub 75), branch: master, commit date: 2019-07-29 14:47, hash: f6cb5f54494e, type: Release
build date: 2019-07-29, 17:17:04
Worked: (optional)

Short description of error
Hello, I'm using Blender on Fedora 30 and I can't get the pen pressure to work on a Wacom Intuos 5S. The pen pressure works with both Gimp and Krita. In debug mode, Blender seems to interpret the pen as a mouse rather than a stylus — there are two mouse pointers on my screen, when I'm using the tablet's pen. The problem is still there on Ubuntu 19.04, on the daily builds, snap version and official release.

wm_event_do_handlers: Handling event
wmEvent  type:1 / LEFTMOUSE, val:2 / RELEASE,
         shift:0, ctrl:0, alt:0, oskey:0, keymodifier:0,
         mouse:(525,742), ascii:'', utf8:'', keymap_idname:(null), pointer:0x7f2e18948488

wm_event_do_handlers: Handling event
wmEvent  type:260 / WINDOW_DEACTIVATE, val:2 / RELEASE,
         shift:0, ctrl:0, alt:0, oskey:0, keymodifier:0,
         mouse:(-5,48), ascii:'', utf8:'', keymap_idname:(null), pointer:0x7f2e18948988

I'm not sure if it helps, but I included the system-info.txt generated by Blender and the results of

xinput list

and

xinput list --long

Thanks a lot !

Exact steps for others to reproduce the error
Launch Blender, switch to sculpt mode, sculpt with the tablet (normally or with dyntopo enabled).

Event Timeline

Sebastian Parborg (zeddb) closed this task as Resolved.
Sebastian Parborg (zeddb) claimed this task.

Your build is missing libXi (Xinput). Install libXi dev package and recompile blender. We have added a fatal warning about this, so if you try to build and are missing libXi with the latest master, it will error out.

Brecht Van Lommel (brecht) reopened this task as Open.

As far as I can tell this is using the official 2.80 release, not a custom build?

Yepp, my bad. I didn't read all the text...

@Brecht Van Lommel (brecht) this is running wayland. I'm guessing the QT and GTK (Krita and GIMP) have working tablet support in wayland.

As you can see from the output, xinput do not see the tablet.

I see xwayland-stylus and xwayland-eraser in the list, that's the tablet pen.

Sebastian Parborg (zeddb) triaged this task as Confirmed, Medium priority.Aug 2 2019, 11:17 AM

I should rephrase, xinput does not see the tablet as a wacom tablet.
I guess that we can just add teh xwayland generic tablet names to our white list. I can try to take care of this as I run wayland too.