I just took the jump of moving over to all Ubuntu on my personal computer and am setting up Diablo III. I was able to successfully deploy the unsupported Crossover needed to install the Diablo III tie. However, when running Diablo, my screen ends up looking like this http://imgur.com/50iUt much of the time. I have attempted to update my graphics drivers both via the Ubuntu Drivers center and through the downloads from the ATI website. Here is a pastebin of my issues I get from the Ubuntu Drivers attempts: http://pastebin.com/NdWftGhG
Video Card: HIS H567Q1G Radeon HD 5670 (Redwood) IceQ 1GB 128-bit GDDR5