Just installed it. Now, of course, it needs some kernel features enabled that I left out during menuconfig. Sadly I can't find a list with requirements quickly. I still remember old powertop also wanted a few things you normally don't have in a kernel config on a standard productive box. So reconfiguring, recompiling and restarting. Well hopefully debugfs is enough. The tools itself is definitely among intel's better ideas. Though there is still a lot in a machine that you can't influnece - be it a hardware or driver limitation.
Stop TCPA, stupid software patents and corrupt politicians!