ACPI Suspend, devd and rc.suspend

[Kevin Oberman]

> Date: Mon, 27 Mar 2006 23:35:09 +1000
> From: Norberto Meijome <freebsd at meijome.net>
> Sender: owner-freebsd-mobile at freebsd.org
> 
> Hi there,
> machine : Thinkpad z60m, acpi.ko, acpi_ibm.ko loaded, 6.1 Prerelease
> kernel and world as of yesterday.
> 
> If I run zzz , /etc/rc.suspend is run. on resume, /etc/rc.resume is
> executed.
> 
> If I hit Fn-F4 ( == suspend event), the acpi sets the machine to
> suspend mode, but /etc/rc.suspend is NOT executed, and neither
> is /etc/rc.resume on resume.
> 
> I don't know how to tell if devd catches the suspend event. I run it in
> debug mode (devd -dD) but couldn't see anything other than all the
> device motherboard's USB hubs being pulled off and added back in.
> 
> I would love some enlightenment on this subject.

In HEAD, devd should be firing off rc.resume, but the problem is in the
suspend side. When triggered by Fn-F4, there is no way to be sure that
rc.suspend is complete before the system halts. zzz (or acpiconf -s3)
will complete rc.suspend before actually telling the system to
suspend. On the other hand, Fn-F4 immediately starts the suspend
sequence. 

While I believe that it can be set to wait for a specific period before
suspending, I don't think that there is any way to assure that anything
completes.

njl@ or Bruno Ducrot would know more about the details. This has been
discussed in the past; probably in acpi at .
-- 
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net			Phone: +1 510 486-8634