[ltp] ACPI & APM Confused

[Theodore Ts'o]

On Mon, Mar 01, 2004 at 06:30:30PM +0100, Franz R?hmland wrote:
> 
> >I have a T41p. I'm using all ACPI, suspened (FN+F?) doesn't work at all. Is
> >APM generally more reliable? What features work in APM that don't work in
> >ACPI and vice versa? 
> 
> Well, One killer feature I believe in ACPI is C3 power mode for the CPU. 
> I don't think this works in apm. That will probably make the battery 
> last a lot longer. (Don't know how much or if there are any problems 
> with it on the T41:s) Basically, I don't really know... :). Someone, 
> please correct me of I'm wrong.

I'm using the speedstep_centrino feature in Linux 2.6, plus cpufreq,
and this has significantly extended my battery lifetime.  At this it
seems pretty close to the Windows ACPI lifetime, although I haven't
done any formal comparisons to justify this statement.

						- Ted