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Re: Power Management

Hans Ulrich Niedermann wrote:
Matthew Garrett wrote:
On Mon, Feb 16, 2009 at 07:02:52PM -0500, brad longo wrote:

Charging of the battery is generally under firmware rather than software control. Laptops will typically stop charging at 100%, at which point the battery will slowly self-discharge. When the battery hits some threshold (typically somewhere between 95% and 97%) the firmware will start charging again.

What you're talking about is presumably an interface to modify that threshold. This is device specific. The tp_smapi driver (which is not in the kernel for exceedingly dull reasons) allows this to be configured on Thinkpads. I don't believe that we know how to on any other systems.

I have been running tp_smapi locally for quite some time to reduce the
number of charge cycles on my battery and thus its lifetime.

Given that kernel modules are a no-go in Fedora and I remember having
read somewhere that most of the code is to be expected to go into 2.6.29
or something similar, I have not published my packages until now.

However, someone still might find them useful:


These tp_smapi* packages require the rpmfusion akmod stuff.

The user interface is a file in /etc/sysconfig with the two threshold
values. I use 40% as start-charging threshold and 80% as stop-charging
threshold. Occasionally when I know I need more capacity on the road, I
manually force it to start charging and charge higher.

Eventually, I'd like to see that functionality in Fedora with a nice
user interface, but right now it works for me, so I can live with that.

I was trying to build the tp_smpi-kmod rpm, but I could /not/ find the dependency buildsys-build-rpmfusion-kerneldevpkgs-akmod. However, I did find the package buildsys-build-rpmfusion-kerneldevpkgs-current. Is there a typo in the spec file, or is this does this package exist somewhere else outside of rpmfusion and the fedora repos?

Brad Longo North Carolina State University
Aerospace Engineering/Applied Mathematics
Raleigh, NC, USA

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