Comment 23 for bug 33950

tp_smapi has been stable (with incremental improvements) for more than a year and supports all relevant ThinkPad models - see the table in http://www.thinkwiki.org/wiki/Tp_smapi#Model-specific_status. It's packaged by Debian (http://packages.debian.org/tp-smapi) and Gentoo (http://gentoo-portage.com/app-laptop/tp_smapi). Inclusion into mainline kernel probably won't happen soon due to procedural/maintainership issues. There's an active user community (mainly on the linux-thinkpad mailing list) and several 3rd party programs that use tp_smapi's battery control and improved accelerometer interface.