What is the reason for high power consumption in 12.04?

Posted by tom on Ask Ubuntu See other posts from Ask Ubuntu or by tom
Published on 2012-06-07T16:25:29Z Indexed on 2012/06/07 16:47 UTC
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12.04

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power-management

I haven't seen this exact question posted or any related answers, so I'm re-posting.

Here is the problem: After upgrading to Ubuntu 12.04 Precise Pangolin, my t420s laptop idles above 20 watts (right now with only Chrome running, I'm using 25.4 W)

I had a similar problem with Ubuntu 11.10, but after much tweaking the power consumption came down < 10 W on idle. The primary culprit to the 11.10 problem was supposedly fixed by default in 12.04.

So my question is, what is happening now?

Computer: Lenovo Thinkpad t420s, with Intel i5-2520M @2.5 Ghz - 2x 4gb ram - disk 0 HITACHI 320 Gb - disk 1 SATA SSD 128 Gb

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