Call For Testing: pm-utils-powersave-policy

Zhengpeng Hou zhengpeng.hou at
Fri Mar 19 01:27:36 GMT 2010

Hi Chase,
Here is my log attached.


On Thu, Mar 18, 2010 at 10:59 PM, Chase Douglas
<chase.douglas at> wrote:
> Hello all,
> I've been working on some fixes, additions, and cleanup to the current
> pm-utils-powersave-policy package that's slated for inclusion in
> Lucid. The package takes some of the good stuff from the old
> laptop-mode-tools package and moves it to policy scripts that are
> invoked by pm-powersave when on battery power. The items currently
> include:
> * 10 second audio codec power down (vs no power down)
> * 1 minute console (tty1) screen powersave timeout
> * 60 (vs 15) second dirty page writeback timeout
> * Disable WOL for ethernet devices
> * Enable SATA link power save mode (when swapping is unlikely)
> * Enable multi-thread and multi-core power save mode
> To test these changes, please add my powersave ppa
> (ppa:chasedouglas/powersave) and upgrade the pm-utils and
> pm-utils-powersave-policy packages. When you transition from AC to
> battery power these scripts will fire and log what they did (if
> anything) to /var/log/pm-powersave.log. You can also test by running
> 'sudo pm-powersave true' to enable power saving, or 'sudo pm-powersave
> false' to disable power saving.
> One easy way to gauge power savings is to install powertop and execute
> while on battery power:
> $ sudo sh -c "sleep 30; powertop -d -t 30"
> This will wait 30 seconds and then retrieve power information for 30
> seconds. During this time you should not use your laptop as we are
> trying to get a steady-state result. It wouldn't hurt to run this a
> few times to ensure the results are consistent. In the output you
> should find a "Power usage (ACPI estimate)" wattage that describes how
> much energy is used by the system.
> I am interested in hearing whether the scripts seem to be doing their
> job by looking at the pm-powersave.log file and the power usage. A
> comparison to Karmic power usage would also be helpful, but not
> necessary.
> Thanks,
> Chase
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