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Date: Sun, 5 Feb 2006 19:04:13 +0100
From: Gerhard Schrenk <deb.gschrenk@gmx.de>
To: Len Brown <len.brown@intel.com>
Cc: Luming Yu <luming.yu@intel.com>, linux-kernel@vger.kernel.org
Subject: EC interrupt mode by default breaks power button and lid button
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Hi,

the following commit breaks power button and lid button on my centrino
notebook (MSI S260; branded as Medion SIM S2100).

|gps@medusa:~/scratch/kernel-tree$ git bisect good
|53f11d4ff8797bcceaf014e62bd39f16ce84baec is first bad commit
|diff-tree 53f11d4ff8797bcceaf014e62bd39f16ce84baec (from 02b28a33aae93a3b53068e0858d62f8bcaef60a3)
|Author: Len Brown <len.brown@intel.com>
|Date:   Mon Dec 5 16:46:36 2005 -0500
|
|    [ACPI] Enable Embedded Controller (EC) interrupt mode by default
|    
|    "ec_intr=0" reverts to polling
|    "ec_burst=" no longer exists.
|    
|    Signed-off-by: Len Brown <len.brown@intel.com>
|    Acked-by: Luming Yu <luming.yu@intel.com>
|
|:040000 040000 9eec66712c68ebe372b2fb2c8d78bdc99df942ab e7e62cd09983730aee468edd4ba1cce50786b7e5 M      Documentation
|:040000 040000 6e7db46918f6124f64a11f6757560078a8a27519 aa8abb1023024902300cb2e7a5bf74acd8c579e8 M      drivers

With

  git revert 53f11d4ff8797bcceaf014e62bd39f16ce84baec

on top of linus' tree I have no problems with power/lid buttons and my
acpid configuration.

Suspend to disk/mem (at least for some seconds/minutes thereafter) with
an unpatched kernel from linus' tree is another possibility to bring
power/lid events back to life.

On my debian (etch) system I have following acpid(?) 1.0.4-3 configuration:

|gps@medusa$ cat /etc/acpi/events/my_lid
|event=button[ /]lid
|action=/etc/acpi/actions/my_lid.sh %e

|gps@medusa:~$ cat /etc/acpi/actions/my_lid.sh 
|#!/bin/sh
|# lid button pressed/released event handler
|
|# echo "lid-event" | wall
|echo platform > /sys/power/disk
|echo disk > /sys/power/state

|gps@medusa:~$ cat /etc/acpi/events/powerbtn 
|event=button[ /]power
|action=/etc/acpi/actions/my_powerbtn.sh

|gps@medusa:~$ cat /etc/acpi/actions/my_powerbtn.sh 
|#!/bin/sh
|# suspend to disk (hybernation) when the power button has been pressed 
|# echo "power-button-event" | wall
|echo mem > /sys/power/state

-- Gerhard