Wacom bamboo pen eraser

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http://askubuntu.com – I've bought a Wacom Bamboo Pen, and it works great in Ubuntu 11.10 32-bit, because the drivers are automaticly installed and the settings are displayed in the systemsettings. My problem is only the eraser on the bottom of the pen. The eraser doesn't work. I've tested in Pinta. How to fix this? (HowTos)