Subject: Re: ACPI userland issues
To: Steven M. Bellovin <>
From: Jared D. McNeill <>
List: current-users
Date: 06/20/2006 15:27:49
On Tue, 20 Jun 2006, Steven M. Bellovin wrote:
> I do have some issues involving the user interface, though.
> suspend/resume scripts
> 	 There don't seem to be any.  I do a lot in my /etc/apm/suspend
> 	 and resume scripts; acpi needs that ability

This is what powerd(8) is for. Scripts are run from /etc/powerd/scripts/, 
the man page has more details.

> other states
> 	Do we support other ACPI states?  Are we going to?  Standby
> 	is nice...

S1 should "just work", but you need to manually shut off your backlight in 
most cases.

> lid open
> 	What does acpi do on a lid open event?  Yes, there's a
> 	script -- but how does the script run if the machine is
> 	still in state 3? If it's not in state 3 at that time, is
> 	there a purpose to the script?  On my T42, I can suspend
> 	with the proper sysctl, and wake up by hitting the Fn key.
> 	If I suspend and close the lid, though, opening it doesn't
> 	wake the machine up.  I haven't tried writing a lid_switch
> 	script that will do the sysctl when I close the lid, to
> 	see if that makes for useful behavior when I open it.

Depends on the hardware. My vaio delivers a "lid open" event on resume, 
which will trigger powerd to run the lid_switch script. My Dell, on the 
other hand, requires you to wake up by pressing the power button, so I 
need to handle this in the wakeup script.