On Mon, Feb 16, 2009 at 07:02:52PM -0500, brad longo wrote: > As I'm sure most of you know, leaving your laptop plugged in and > charging with a full battery charge is harmful for the battery. I have > been trying to see if Fedora's power management tool has something built > in so that when the battery reaches full charge, it will then discharge > to lets say around 95% before beginning to charge again. Friends of > mine with the same laptop use such measures except they are running > windows. However, based on the fact I did not see any documentation > about this, and that my battery charge does not appear to fluctuate at > all once it becomes fully charged (according to the statistics), I'm > guessing no such thing exists in Fedora. Does anyone have any > information as to whether this safety feature exists in Fedora, or > whether some other measures exist instead? Basically I'm just wondering > if I need to periodically unplug my laptop to preserve the lifespan of > the battery, which would be annoying. Also if this is not a feature is > anyone working on developing something like this for Fedora? 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. -- Matthew Garrett | mjg59@xxxxxxxxxxxxx -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
