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List:       acpi4linux
Subject:    RE: [Acpi] reduce idle power
From:       "Therien, Guy" <guy.therien () intel ! com>
Date:       2000-07-19 10:30:15
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APM and ACPI with OS-directed power management should reduce your notebook
power consumption to a few watts max when idle. This depends on the level of
hardware power management implemented by your system. APM or ACPI/OSPM can
take advantage of the hw power management provided. When idle the CPU and
chipset is placed into a low power state. If idle long enough, other devices
should also be turned off (e.g. audio, disk, etc).
Guy

-----Original Message-----
From: Yung-Hsiang Lu [mailto:luyung@stanford.edu]
Sent: Tuesday, July 18, 2000 8:51 PM
To: acpi@phobos.fachschaften.tu-muenchen.de
Subject: [Acpi] reduce idle power


Hi,

Does anybody knows the answer to this question, or some partial 
answers?  Thanks!

"When my notebook is idle (for a 5-min coffee break), it still takes nearly 
10 W.  This excludes the display, the hard disk, the network card.  Pentium 
idle instruction (hlt) is used.  Is this 10W consumed by chips on the 
motherboard?  Does APM or ACPI help?"

I don't think APM helps reducing idle power due to chipsets unless entering 
suspend mode.  How about ACPI?

Yung-Hsiang Lu       luyung@stanford.edu     (650)725-3647
Computer Systems Laboratory, Stanford University
Gates 326, 353 Serra Mall, Stanford, CA 94305   


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