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Old 12-10-2011, 03:17 PM
Colin Ian King
 
Default PowerTop recommendations: an evaluation

Hi there, more test results..

As part of the Kernel Power Management blueprint
https://blueprints.launchpad.net/ubuntu/+spec/hardware-p-kernel-power-management
I was given a task to measure various PowerTop recommended "tunables" to
see how beneficial they are.


I've run some extensive tests on two typical mobile platforms and
analysed the power consumed of "Bad" and "Good" tunable power states for
various devices, controllers and kernel tunables. There is a lot of
data, some of it provides a very clear indication of large power saving
gains, some is less clear, and some settings are quite unexpected as
they seem to consume more power than expected in a power saving state(!)


The data (as a LibreOffice spreadsheet) + results can be found in:

http://zinc.canonical.com/~cking/power-benchmarking/powertop-good-bad-recommendations/

In summary:

For best power consumption, we should have some pm-utils power.d scripts
to put the following device controllers into a low power state:


* Webcam
* Audio
* DRAM
* Ethernet
* Wifi
* Bluetooth
* SATA link
* MMC/SD

Comments and questions most welcome.

Colin

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