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I am thinking about switching back to the newest Ubuntu 13.10 on my x220. I had different Ubuntu releases installed before and quite liked it. Main problem was always the power management of the i7 CPU. After looking around different Ubuntu and ThinkPad Communities I am still not sure if the problem has been solved with this - or previous releases.

Will there still be any known problems with the power saving / cpu throtteling / fan control on x220´s with i7 cpu??

Phil
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Yes, a problem like you describe is likely to be present. A bug report describing the issue is here, and still an open issue for the Linux kernel:

"i915 doesn't reach RC6 state after s2ram - Thinkpad T420, X220" https://bugzilla.kernel.org/show_bug.cgi?id=48791

Mark Stosberg
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It will work wonderfully, just install TLP from http://linrunner.de this app has been made for Thinkpads but works with all laptops. On my ASUS i7s I get the same battery life as on Windows 8.

Arup Roy Chowdhury
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