I upgraded from the Toshiba M200 to the M400 a while back. I’ve tried many different Linux distributions since then, briefly flirting with Fedora 11, and have now settled on Ubuntu 9.10 Alpha.
Anyway, that is all beside the point. Anyone setting one of these up needs to take a look at this site. It discusses creating a working rotate script, enabling the rotate button and more. A great resource.
The page is written for 9.04 but seems to apply equally to 9.10.