Mute optical output

[needtosearchforum]

Hi

I have Ubuntu 12.04 installed on my Macbook Pro 5.5 and on every boot it keeps enabling the optical output. How do i make the mute stick after a reboot?

[baloo101]

Hi

I have Ubuntu 12.04 installed on my Macbook Pro 5.5 and on every boot it keeps enabling the optical output. How do i make the mute stick after a reboot?

Hi, probably same thing here

Open Terminal
type "alsamixer"
Go to "S/PDIF" (not the last one)
Type on your keyboard "M" for mute.

I don't know yet how to save these settings but id'like to
All command are without quotes. I hope this will help you. Have a nice day.

[pantropik]

Use the command:

amixer set IEC958 off

To make it permanent either add it to your rc.local or create a script and add it to your startup items.

[needtosearchforum]

Use the command:

amixer set IEC958 off

To make it permanent either add it to your rc.local or create a script and add it to your startup items.

Thanks. Using this command mutes the optical output but adding it to my /etc/rc.local file doesnt seem to work. I added a redirect to logfile to my rc.local file:

amixer set IEC958 off >> /tmp/logfile 2>&1
exit 0

And the output of logfile is:

Simple mixer control 'IEC958',0
  Capabilities: pswitch pswitch-joined penum
  Playback channels: Mono
  Mono: Playback [off]

So it seems the amixer command is run during boot but something else enables it when i sign in.