MyPaint switches to straight line mode when using Wacom pen

Description of the Problem, or Question?

When I start painting with my Wacom pen, MyPaint immediately switches to straight line drawing… which obviously is kind of annoying and unintuitive. I have no idea why… I have no idea what I changed (as I don’t use MyPaint that often). It just started doing it and I don’t even know where I should start looking to fix it. I uninstalled and reinstalled MyPaint, the problem remains though. illustrates the issue.

Basic System Details

MyPaint version:

Operating System + Version:
Fedora release 25 (Twenty Five), Cinnamon 3.4.6

Make and Model # of Graphic Tablet:
Lenovo X230 Tablet (one of those older convertible laptops with a Wacom digitizer)

Please Tell Us How to Reproduce the Problem in Steps.

Start MyPaint, start drawing in free hand mode, be amazed that it’s just a straight line.

That’s a really old version of MyPaint, you might want to look at updating it if possible. If not, try starting mypaint with a temporary configuration from the command line with something like

mypaint -c /tmp/

Yeah try our nightly flatpak which follows our master branch of MyPaint. The current builds also comes with tools that allows us to diagnose graphic tablet problems.

Thanks for the suggestions. However, starting with a temporary config changes nothing and that flatpak doesn’t install:

$ flatpak --user install mypaint-master-repo org.mypaint.MyPaint-Nightly
Erforderliche Laufzeit für org.mypaint.MyPaint-Nightly/x86_64/master (org.gnome.Platform/x86_64/3.24) ist nicht installiert. Suche läuft …
Die erforderliche Laufzeit org.gnome.Platform/x86_64/3.24 wurde in keiner konfigurierten entfernten Quelle gefunden.
Fehler: The Application org.mypaint.MyPaint-Nightly/x86_64/master requires the runtime org.gnome.Platform/x86_64/3.24 which is not installed

I tried building it from source, but gave up after 30 minutes of trying to resolve dependencies :-/

Nevermind this, I built libmypaint from source and was able to compile and run mypaint from the current sources, that version works well.

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