It looks like the debacle concerning RC6 power-savings support
for Intel Sandy Bridge hardware is finally behind us. Intel thinks
everything is worked out and ready to be enabled upstream (again) with
the next Linux 3.4 kernel cycle and Canonical has enabled RC6 by default
in Ubuntu 12.04 LTS. Here are some tests showing the performance
benefits and power-saving abilities of using the RC6 hardware feature on
Sandy Bridge processors.