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From: James Green <jim@thebadger.org>
To: Randy Bush <randy@psg.com>
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Date: Sat, 31 Jan 2004 12:28:32 +0000
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Subject: Re: API to turn off the display
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Hi Randy,

On Sat, 2004-01-31 at 05:33, Randy Bush wrote:
> > 
> > Recompiled the kernel with:
> > options SC_NO_SUSPEND_VTYSWITCH
> > 
> > and now it all works!
> > 
> > I added to rc.suspend:
> > 
> > xset -display :0 dpms force off
> > sleep 3
> > sysctl hw.acpi.video.lcd0.active=0
> > sleep 1
> > sysctl hw.acpi.cpu.throttle_state=1
> > 
> > and to rc.resume:
> > 
> > sysctl hw.acpi.cpu.throttle_state=8
> > xset -display :0 dpms force on
> > sysctl hw.acpi.video.lcd0.active=1
> > 
> > The order of DPMS and ACPI is important. This works on both the console
> > and in X. Next up is to add in ataidle...
> 
> this helps a LOT.  but ...
> 
> i can suspend once and resume once.  after that, it will not suspend
> with lid or button.

AFAIK, only acpiconf  calls the rc.suspend and rc.resume scripts (please
correct me if I am wrong!), so the above method only really works if you
use acpiconf to suspend and the power switch to resume. I find it mostly
works using acpiconf -s 1 to suspend, and then closing the lid. It
resumes on lid switch open, but does not run rc.resume. 

I have also tried calling scripts from devd to process the lid switch
events, however the rc.suspend scripts does not get called until after
resume (and it seems after rc.resume!). I have not tried it yet, but it
should be possible to call just rc.resume from devd for the lid switch
open event only.

James