From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andre Eisenbach <andre-+hZUvIEKc2q1Z/+hSey0Gg@public.gmane.org>
Subject: DSDT Change (Compaq Presario 2100)
Date: Fri, 28 May 2004 06:21:25 -0700
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Hey!

Sorry for semi spamming the list tonight - but I'm finally getting places :)

As previously mentioned, my Compaq as well as many other HP model notebooks=
=20
slow down considerably when running on battery. Short off "ACPI=3Doff" ther=
e=20
seemed to be no workaround.

Well, tonight, while recompiling the DSDT a few times to remove warnings an=
d=20
errors, I stumbled across this (in method SMSL

If (0x01)
{
	Store (\_SB.PCI0.ISA.EC0.TTDC, TRDC)
	Store ("AC remove! Set Throttle Duty Cycle ---: ", Debug)
	Store (TRDC, Debug)
	Store (0x01, TREN)
}

I am assuming that the "If (0x01)" was put there by a developer to disable=
=20
this throttle duty cycle mechanism easily for testing, or maybe for differe=
nt=20
OEMs.

In any case, I changed "If (0x01)" to "If (0x00)" and voila, I am typing th=
is=20
email from KDE with the power cord unplugged - no slowdown at all.

Now my questions:

1) Does this sound sane?
2) Should I submit the updated DSDT to acpi.sf.net?

Cheers,
   Andr=E9

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