--- Jamie Lokier <lkd@tantalophile.demon.co.uk> wrote:
> The only visible effect is that the laptop won't
> suspend any more.
> Something obviously got set because when acpid is
> killed, the laptop
> still doesn't suspend.
Right, APM is not being engaged when it is
overriden by ACPI so I wouldn't expect APM
suspend to work at all. Further, once acpid
is started, ACPI is enabled in the BIOS. After
that any attempt to use APM features is going
to fail (yes, even after acpid is killed).
> My question is: is there any advantage for me in
> enabling ACPI in the kernel, and/or running acpid
> at the moment? Will the laptop consume less power
> than when it's using APM?
Depends on how good of an APM/ACPI implementation
you have. ACPI C-states definitely save power
and most ACPI laptops support at least C1 and C2
(C3 is the deepest processor power state). Some
APM implementations allow the CPU to be slowed.
I don't know what the actual power savings of
C-states vs. APM CPU slowing are on your system.
It might be interesting to test it out and see
which causes your battery to last longer.
-Andy
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