NAME¶
athcool - control power-saving mode on AMD Athlon/Duron CPUs
SYNOPSIS¶
athcool command
DESCRIPTION¶
athcool is a program that controls the power-saving mode on AMD
Athlon/Duron CPUs. The parameter
command is one of:
- on
- Enable power-saving mode.
- off
- Disable power-saving mode.
- stat
- Query power-saving mode.
- list
- List supported chipsets.
WARNINGS¶
athcool only sets/unsets the "Disconnect enable when STPGNT detected"
bit in the northbridge of the chipset. To save power, someone has to send the
STPGNT signal when the CPU is idle. This is done by the ACPI subsystem when
the C2 state is entered. Hence, you need ACPI support in your kernel to
achieve power savings.
Depending on your motherboard and/or hardware components, enabling power-saving
mode may cause:
* noisy or distorted sound playback,
* a slowdown in disk performance,
* system freezes or instability,
* massive corruption of the filesystem (rare, but observed at least
once).
Before use athcool, you must recognize these
potential DANGERS. Please
use athcool
AT YOUR OWN RISK.
athcool is supplied "as is". The author disclaims all warranties,
expressed or implied. The author and any other persons assume no liability for
damages, direct or consequential, which may result from the use of athcool.
AUTHOR¶
Copyright (C) 2002-2004 Osamu Kayasono <jacobi@jcom.home.ne.jp>
This manual page was written by Nicolas Boullis <nboullis@debian.org>. And
many users reported to me it works (or not). Thanks to all who contributed to
athcool.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; either version 2 of the License, or (at your option) any later
version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc., 675 Mass
Ave, Cambridge, MA 02139, USA.
On Debian systems, the complete text of the GNU General Public License can be
found in /usr/share/common-licenses/GPL.
SEE ALSO¶
For more information about power-saving with Athlon/Duron CPUs, see the
Athlon-Powersaving-HOWTO at
http://www.daniel.nofftz.net/linux/Athlon-Powersaving-HOWTO.html.