Improve energy consumption with Ubuntu and Lenovo IdeaPad Z370 (sandy bridge-chipset)

Update 2015-03-15: As Antiplex mentioned in the comments, the resources are slighlty out of date. An update is pending I use my laptop (Lenovo Z370, with Ubuntu 11.10) a lot in the college. Unfortunatly there aren’t enough plugs in the wall for all students and I’m not willing to bring a plug board with me every time. So my approach to the problem was to improve the energy consumption of my laptop.

Ubuntu 11.10 + Lenovo Ideapad Z370

Two days ago I’ve updated Ubuntu to 11.10 and it worked well. I started from scratch, so I won’t have to deal with “old” problems: Here is my setup: Plain vanilla Lenovo Z370 Harddrive was replaced by a 60 Gb Sata2 SSD Ubuntu 11.10 (Desktop edition) I installed the IdeaPad Driver Package (get it here) to get rid of a lot of the “Keycode 240” On the pro side: