Comment 189 for bug 760131

Unfortunately kernel 2.6.38-12.51 doesn't improve the situation that much for me either. Maybe a bit, but I'm not sure about that. I was surprised to find out that even pcie_aspm=force and i915_enable_rc6=1 don't improve power consumption anymore. Some months back pcie_aspm=force still improved the situation for me.

My system is a ThinkPad T420 with Sandy Bridge i5, integrated i915 video controller and running up-to-date Ubuntu Natty.

I compared the output of powertop with kernel 2.6.38-11.50 and with kernel 2.6.38-12.51, both with and without the boot options, and with and without firefox running. See my exact results attached.