Re: [CentOS] CentOS 6 : Tip for significantly increasing battery life / reducing power consumption (Thinkpad X220 Tablet)

I was not happy with the power consumption of CentOS 6 x86_64 on a new Lenovo Thinkpad x220 Tablet and I worked on reducing it. I just wanted to share with the list one of the changes which gave me the most significant improvement.

As per http://www.williambrownstreet.net/blog/?p=387, add the following kernel arguments to the GRUB boot configuration:

pcie_aspm=force i915.i915_enable_rc6=1 i915.lvds_downclock=1 i915.i915_enable_fbc=1

As a follow-up: since the update to 6.4, these kernel arguments are *no longer required* in order to have a reasonable power consumption on a Thinkpad X220.

With tuned profile 'laptop-battery-powersave', the idle laptop consumes a bit more than 10W (with display turned of: 8W)