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I'm using acpid to detect when my headphones are plugged in. According to acpid_listen, the relevant events are 

jack/headphone HEADPHONE unplug
jack/headphone HEADPHONE plug

I created the file /etc/acpi/events/headphone_jack like this:

event=jack/headphone.*
action=/etc/acpi/actions/headphone.sh "%e"

The event still doesn't trigger if I use jack[ /]headphone instead. The script /etc/acpi/actions/headphone.sh looks like this:

amixer set Master off

In other words, every time the headphones are plugged in or unplugged, the volume is muted. This amixer command works in the terminal. I restarted the acpid service with sudo /etc/init.d/acpid reload, but the event still isn't triggering.

What am I doing wrong? I'm using Debian 10 ("buster") x64 on a Thinkpad X1 Carbon 4th generation.

Michael A
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    The script might need "#!/bin/sh" on the first line, and it must of course be executable. – Ralph Rönnquist Dec 29 '19 at 02:32
  • I'm embarrassed that I forgot to make the script executable. I use `#!/usr/bin/env bash` as the shebang, but otherwise, your answer is perfect. Thank you. – Michael A Dec 29 '19 at 14:51

1 Answers1

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The script might need "#!/bin/sh" on the first line, and it must of course be executable.

It's a not un-common mistake to miss or forget the latter, which is fixed with

$ chmod a+x /path/to/script

A more exhaustive description of all this is found in the standard manual pages with:

$ man execve

On Debian systems those manual pages have nowadays been relegated out of the standard collection, and you may need to install them from the manpages-dev package with:

# apt-get install manpages-dev

Note that the package installation requires root access, unless you have some other means of installing packages.

Ralph Rönnquist
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