I found this site that several people have posted the results and model using a driver they have there. Apparently, they are using a modified AceCad tablet driver and getting some success.

http://www.stud.fit.vutbr.cz/~xhorak28/
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This guy has a Genius Tablet working on Open SUSE. Don't know which tablet or which version of Open SUSE.

http://duncan.mac-vicar.com/blog/archives/173