Learning Rails - Advice for development environment

Yes, it seems that Linux’s (Ubuntu in my case) battery management is not as good as that of Windows 7.

I am running 12.04 and W7 as alternative OS on a Dell XPS. As an old Unix developer I use emacs on Ubuntu (and xemacs on W7) as editor. It has nice modes for a lot of programming languages. Debug facilities of RoR are very nice, so why an IDE? rbenv for different versions of Ruby and Rails.