Slow input on X11 from Wacom tablet

[pbartyik]

Affects versions :

• OS: Arch linux
• Version of Xournal++ 1.0.20-2

Describe the bug
Slow reaction to input when drawing with Wacom tablet on X11 (gnome-shell)
No delay in input reaction in Krita when drawing with Wacom tablet on X11 (gnome-shell)
No delay in input reaction when drawing with Wacom tablet on wayland (sway)
No delay in input reaction when drawing with mouse on X11 (gnome-shell)

To Reproduce
Steps to reproduce the behavior:

1. Launch xournalpp from gnome-shell running X
2. write a few letters (first couple letters are processed OK, after that it starts lagging)

Input Logs
debug_gdk_input.txt
debug_input.txt

Expected behavior
There should be no delay on X11 using wacom tablet like there isn't one on wayland / or with mouse on X11

Screenshots of Problem

[Technius]

AUR build looks like it's being compiled in debug mode (default) instead of release mode, which may be responsible for slowness:
https://github.com/archlinux/svntogit-community/blob/826a968868664bac419f45cc4f89f597f6af458b/trunk/PKGBUILD#L23

I don't use Arch though. Can someone confirm?

[tattsan]

I use Arch Linux. I always build 1.1.0-devel with:

cmake -DCMAKE_INSTALL_PREFIX=/usr

• I run Xournal++ on X11, but not use gnome-shell.
• I use Wacom Cintiq pro 32 and Wacom Cintiq 16.
• I don't use Xournal++'s sound recording feature, no jack connection.

and no delay occurs. I've also checked Arch's official package 1.0.20-2, but got no delay.
Needs more info ...

[pbartyik]

The delay occurs with basic official community/xournalpp 1.0.20-2 (1.1 MiB 4.2 MiB) (Installed) as well. I didn't install the AUR git package, I cloned the repo and built it manually as per instructions found here: https://github.com/xournalpp/xournalpp/wiki/How-to-provide-debug-info-for-input-related-bugs

I use the Wacom intuos pen & touch small tablet, model CTH-480.

What further information would be needed?

[bhennion]

@pbartyik Is this still happening with the latest release?

If so, could you provide a libinput record of you stylus: run

$ libinput record > recording.yml

it will ask for you to select a device. Let is run in the background. Then open Xournal++ and try to write something with the stylus. Go back to you terminal and stop the recording (CTRL + C). Then post here the yml file. (you may need to be in the input group or to run as root/sudo for libinput record to work).

[MeisterLLD]

Did you solve that ? I had the same problem until I found out that what was causing it was the artithmetic mean stabilization, I disabled it and I have no input lag now. Nonetheless xournalpp is still pretty slow when writing text for example.

[bhennion]

Closing for inactivity and lack of info