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  From: Craig Markwardt <craigm@pcasun3.gsfc.nasa.gov>
  To  : Alearner J <Alearner@hotmail.com>
        <apmd-list@worldvisions.ca>
  Date: Sun, 26 Sep 1999 22:50:15 -0400 (EDT)

Control apm

Alearner J writes:
 > Hi,
 > 
 > Need help. APM really confused me. 
 > 
 > - Where should I control APM? In BIOS Setup (PM) or in OS. If in Linux,
 >   how can I set the APM parameters such as idle time for standby, 
 >   suspending and HD power-off. Also I need some introduction on how wake-up
 >   events work with Linux.
 > - How can I disable APM so that I can burn CDR safely. After burning CDR,
 >   I want to enable APM back again without restarting Linux and changing 
 >   BIOS setup.
 > - Why on the console, I get a lot of message:
 >      apm: busy: Unable to enter reqested state
 >   I use x-terminal through serial port but seldom the console.  

Unfortunately, there is no universal way to enable or disable APM from
the console.  I did have an enhancement to the "apm" command line tool
which did this, but it required support in the kernel which is not
official yet.  However, if you have the newest kernel (plus Stephen
Rothwell's newest patch), and the newest apmd (beta 9), *and* set
SUSPEND_ON_AC=false, then suspend and standby events will be disabled
whenever you are on AC power.

The ACPI guys are working on more sophisticated stuff, but I don't
think it's really good for users yet.

Craig