acpi

[Andy Green]

Lamont R. Peterson wrote:

> I would love to see battery life with Fedora right up there with the other 
> Linux & BSD systems.  I don't know what to try, either.  So far, I've just 
> resigned myself to the fate that battery life is just going to be shorter 
> with Fedora.

Just an idea -- on this laptop at least the ACPI reports the current 
being drawn from the battery with good resolution, eg, when plugged in 
and charged

cat /proc/acpi/battery/BAT1/state

cat /proc/acpi/battery/BAT1/state
present:                 yes
capacity state:          ok
charging state:          charged
present rate:            0 mA
remaining capacity:      4500 mAh
present voltage:         12493 mV

and when running from Battery

present:                 yes
capacity state:          ok
charging state:          discharging
present rate:            1283 mA  <--------
remaining capacity:      4500 mAh
present voltage:         12338 mV

The "present rate" value is very sensitive to backlight level, HDD on or 
off, USB stuff plugged in, CPU load and so on.  I have this hooked up to 
  the KDE "System Guard" telemetry displays in the kicker.

At least this allows you to put a number on exactly how much worse 
Fedora does than another distro you can run on the same laptop, and to 
objectively determine any improvement from evasive actions.

-Andy
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