cvs commit: src/sys/dev/acpica/Osd OsdSynch.c src/sys/i386/include acpica_machdep.h src/sys/ia64/include acpica_machdep.h src/sys/amd64/include acpica_machdep.h

[M. Warner Losh]

In message: <4099FE31.9020802 at freebsd.org>
            Scott Long <scottl at FreeBSD.org> writes:
: I've found that the best way to extend battery life on a laptop is to 
: turn down the display brightness as low as possible.  CPU throttling,
: PCI power states, etc, make a small (but measurable) difference on my
: P4-M laptop, but the real win comes from turning down the brightness.

My Sony has similar effects, but throttling down the CPU from 8 to 2
increases my battery life from about 3 hours to 4 hours.  Dim LCD has
a similar effect.  Turning off the unused PCI devices gives a dozen
more minutes.

Warner