[Ubuntu] Enable power saving in Lenovo X61

Ref: http://www.webupd8.org/2014/04/prevent-your-laptop-from-overheating.html

Because I installed Ubuntu 14.04 in my Lenovo X61.
Although it could switch into the sleep mode after closing the lid. It’s not really using the power saving mode.
So we must edit the GRUB file.

Find the “GRUB_CMDLINE_LINUX_DEFAULT”, and add “intel_pstate=enable” at the end, like this.

Then update the grub config

Finally, we must reboot and use powertop to check its status.

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