powernowd and laptop mode

[Paul Sladen]

On Mon, 28 Mar 2005, Carlos Eduardo Pedroza Santiviago wrote:
> Luis Lopez Lopez wrote:

Hello Carlos,

> I think its correct, since the CPU should go to MAX only when an app
> needs it, and stay with minimal frequency when the CPU is idle.

I'm inclined to agree with you, my reasoning is below.

> | I think that powernowd only should be started if laptop is connected to
> | AC,

'powernowd' needs[0] to be running to 'notice' when you connect/disconnect
and change its policy accordingly.

> Maybe. If you are connected to AC, why save power?

Why waste energy...  This planet is getting fairly hot as it is.  :-)

> That's why powernowd only makes sense when using batteries, and there's
> some modifications posted here, which i liked:

Here's two:

  Excessive CPU speed => Excessive Heat => Noisy fans turn on.

  Batteries re-charge faster, because:
    (a) less electrical current into CPU => more current into batteries
    (b) lower temperature => increased current before batteries overheat

Since the CPU speed is always ramped up exactly when it is required, I don't
understand why people are wanting to disable it.

	-Paul

[0] 'Need' is wrong word, it's just easier to have 'powernowd' perform
the AC/Battery check itself.
-- 
I didn't know it snowed here!  Amsterdam, NL