[ALSA - driver 0000667]: How to integrate turning on and off LED:s on laptops

[bugtrack@alsa-project.org]

The following issue has been RESOLVED.
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<https://bugtrack.alsa-project.org/alsa-bug/view.php?id=667> 
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Reported By:                linus
Assigned To:                tiwai
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Project:                    ALSA - driver
Issue ID:                   667
Category:                   PCI - intel8x0
Reproducibility:            always
Severity:                   feature
Priority:                   normal
Status:                     resolved
Distribution:               Fedora Core 3
Kernel Version:             2.6.9
Resolution:                 fixed
Fixed in Version:           
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Date Submitted:             11-23-2004 15:27 CET
Last Modified:              12-27-2004 15:28 CET
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Summary:                    How to integrate turning on and off LED:s on laptops
Description: 
This machine, an HP Compaq NC6000 (also on other models
such as NC8000) has a mute LED that
turns on and off when mute is activated/deactivated.
It is accomplished by way of the "External Amplifier"
setting - this has been wired to a LED instead of an
amplifier, so the "mute" function should (theoretically)
activate/deactivate the "External Amplifier" when muting
is selected for the device. The chip used is AD1981B.

This script shows how it is done:

if ( amixer sget "External Amplifier"|grep off > /dev/null )
then
           # Toggles the LED, no actual volume change
           amixer set "External Amplifier" unmute > /dev/null
           # Toggles the audio level
           amixer set "Master" unmute > /dev/null
else
           amixer set "External Amplifier" mute > /dev/null
           amixer set "Master" mute > /dev/null
fi

The question of how this is to be implemented remains. Is
this an issue for ALSA or shall it be handled on a higher,
user-space level? I also have a bug open in GNOME for the
same thing, I need to decide how to finally resolve this
and need input from the ALSA team on the best solution.

(See http://bugzilla.gnome.org/show_bug.cgi?id=157748)
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----------------------------------------------------------------------
 tiwai - 12-23-04 16:08 
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OK, here is a test patch.  Could you try it wheter it works?

----------------------------------------------------------------------
 tiwai - 12-27-04 15:28 
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I commited the newer patch to CVS.

Issue History
Date Modified  Username       Field                    Change              
======================================================================
11-23-04 15:27 linus          New Issue                                    
11-23-04 15:27 linus          Distribution              => Fedora Core 3   
11-23-04 15:27 linus          Kernel Version            => 2.6.9           
11-23-04 15:41 tiwai          Note Added: 0002516                          
11-23-04 21:28 linus          Note Added: 0002528                          
11-24-04 12:22 tiwai          Note Added: 0002549                          
11-24-04 13:00 IceRAM         Note Added: 0002555                          
11-24-04 13:07 tiwai          Note Added: 0002558                          
11-24-04 14:27 linus          Note Added: 0002562                          
11-24-04 15:07 linus          Note Added: 0002567                          
11-24-04 18:47 Clemens LadischFile Added: muteled.c                        
11-24-04 18:47 Clemens LadischNote Added: 0002580                          
12-02-04 19:36 tiwai          Note Added: 0002695                          
12-23-04 16:08 tiwai          Note Added: 0002923                          
12-23-04 16:09 tiwai          File Added: mute-led.diff                    
12-27-04 15:28 tiwai          Status                   new => resolved     
12-27-04 15:28 tiwai          Resolution               open => fixed       
12-27-04 15:28 tiwai          Assigned To               => tiwai           
12-27-04 15:28 tiwai          Note Added: 0002962                          
======================================================================




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