I have the RAT5 and am running linux mint currently. I tried the old change xorg.conf trick, and it worked on normal ubuntu, but after moving to mint, the same trick doesn't work anymore. This is what is currently written in xorg.conf:
I've got this working like a charm on Ubuntu 12.04, I'll dig out my config tomorrow. I only saw instructions for RAT 7s before getting it to work though and IIRC it's a slightly difference patch for the RAT 5.