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  From: Craig Markwardt <craigm@pcasun3.gsfc.nasa.gov>
  To  : Chris Worley <cworley@symbionsys.com>
  Date: Mon, 17 Jul 2000 19:49:21 -0400 (EDT)

Using power switch to go into standby mode

As far as I know there is no way to change the behavior of the power
switch under APM.  However, the power switch may be programmable (or
at least more programmable) under ACPI.  Unfortunately ACPI for Linux
is in a less-refined state at the moment.

Craig

Chris Worley writes:
 > I'm using an I-Opener running Linux 2.2.14 as an XTerminal.
 > 
 > I want to associate the power on/off switch with a standby mode (i.e.
 > screen power off).
 > 
 > In QNX, the power switch merely turned off the power to the monitor...
 > How did they do that?  I'd like to be able to do the same in Linux.
 > 
 > I don't want the network to shutdown (parts of the X session would
 > timeout), I just want the machine to look as if it were off, but when
 > turned back on, is still in the session as it was left.
 > 
 > I haven't found anything in APM that would be appropriate.  "apm -s"
 > unloads the pegasus USB driver which panics the system.  "apm -S"
 > flashes the screen off and back on.  I can't see any hook in the apm
 > driver for catching the power-off interrupt, but I know it's there:
 > whenever the kernel panics (i.e. after trying to unload the pegasus
 > driver), I have to pull the power cord to shut it off... the switch
 > won't work.
 > 
 > Any ideas on how to associate the switch to standby mode?
 > 
 > Thanks,
 > 
 > Chris
 > 
 > P.S.: I apologize if this post is a repeat... I never received my copy
 > from the list server, and have been unable to get relevant archive
 > information from the list server (unless nobody has posted since
 > June???).  The list archiver really needs a better search mechanism.
 > 
 > 
 >