Xinput2 bug report: https://bugs.freedesktop.org/show_bug.cgi?id=92186
Qt bug report: https://bugreports.qt.io/browse/QTBUG-48151
Patch fixing jitter: https://codereview.qt-project.org/#/c/110334/
-----
Workaround library (built/tested on Kubuntu 15.10)
https://dl.dropboxusercontent.com/u/16058153/Krita/libqxcb.so
```
cd /usr/lib/x86_64-linux-gnu/qt5/plugins/platforms
sudo mv libqxcb.so libqxcb.so.old
sudo cp ~/Downloads/libqxcb.so .
```