Can't configure stylus buttons

[Marcelo Magno T. Sales]

Hello,

I'm running Kubuntu 14.04 (KDE backports PPA enabled) and KDE 4.14.13 on two 
computers, a desktop and a notebook.

When I connect a wacom Intuos Pro tablet to the desktop, I can't configure the stylus 
buttons. They both always perform left-clicks, no matter what function I assign to them 
using the Input Devices applet in System Settings. Everything else works fine, including 
pressure sensitivity and express buttons setup. If I stop the wacom tablet daemon, I can use 
the tablet as if it was a mouse and the stylus buttons act as middle-click and right-click, but 
then I lose pressure sensitivity and express buttons customization, among other things.

However, when I plug the same tablet to the notebook, everything works fine, including the 
stylus buttons. I can't find a difference in software versions or configurations between the 
desktop and the notebook.

Any idea on what is going on here, or on how to debug this?

Thanks,

Marcelo
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