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- Subject: hw.acpi.cpu.economy_speed
- From: oberman at es.net (Kevin Oberman)
- Date: Fri Jan 16 13:37:10 2004
> From: sebastian ssmoller <sebastian_(_dot_)_ssmoller_(_at_)_web_(_dot_)_de>
> Date: Fri, 16 Jan 2004 21:13:19 +0100
> Sender: owner-freebsd-mobile_(_at_)_freebsd_(_dot_)_org
> i noticed that this sysctl flag is not longer supported. what should one
> use instead to handle different cpu speed when running battery ?
Use hw.acpi.cpu.thottle_state is the thing. It may be set to a value
between 1 and hw.acpi.cpu.throttle_max where throttle_max is full speed.
If you have a Centrino or P4-M, you can also save power by use of
hw.acpi.cpu.cx_lowest. It can be set to 0-2 which enables "deeper sleep"
when the system is idle. Not all states are available on all
systems. The higher values will result in a longer time to wake up after
the CPU becomes idle, but will use less power.
Both of these have values in /etc/defaults/rc.conf, but I don't think
Nate has hooked those up, yet. At the moment you need to set them
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman_(_at_)_es_(_dot_)_net Phone: +1 510 486-8634