No sound from Lenovo T420 dock

chx · 2014-07-13 17:37:56

The internal speakers work fine, the headphones work fine, external speakers work when plugged into the headphone jack. When the external speakers are plugged into the dock they mute the internal speakers but there is no sound.

emeres · 2014-07-16 05:01:04

When docked in, are there any new [audio] devices listed?

chx · 2014-07-18 11:26:50

Not that I know of.

aplay -L > /tmp/dock_list.txt
aplay -L > /tmp/undock_list.txt
diff /tmp/dock_list.txt /tmp/undock_list.txt

nothing. Of course I undocked after the first.

Last edited by chx (2014-07-18 11:27:18)

mkoskar · 2014-07-18 11:48:15

You probably have to un-mute dock output ( Headphone 1 in my case ).

I have a simple script for toggling it:

$ cat bin/voltoggle-dock
#!/bin/bash

set -e

amixer -q set Headphone,1 toggle
status-osd audio

chx · 2014-07-21 03:32:31

The error went away. I have no idea what happened

emeres · 2014-07-21 09:39:15

Did you do a system upgrade? How does the laptop connect with the dock station? Do the connectors fit tight or is there a little bit of room between them?

chx · 2014-07-21 22:58:49

I have certainly undocked and redocked and alsorebooted a few times.... heaven knows what helped at the end. I am relatively sure I tried the undock/redock a few times to make sure it's not the connection. It'd be weird if it'd be the connection cos I use monitor, keyboard, mouse from the dock, all those work just not the audio?

emeres · 2014-07-21 23:30:57

Should the connection of audio be analog (highly likely), then it is possible, although looking at the socket unlikely. Is that it or at least similar?

Last edited by emeres (2014-07-21 23:31:39)

chx · 2014-07-28 03:38:45

That's the dock and yes it's analog.

emeres · 2014-07-28 12:50:32

Check the contacts next time then, clean them with isopropanol on the socket and connector. If you have a multimeter, you could check continuity or better yet resistance from the docks socket to jacks sockets (you could use a dummy jack plug), when powered down of course.

dbacc · 2014-12-07 16:04:10

Hey. I'm having the same issues with my T420 dock. The speakers of my laptop get muted if something is plugged into the OUT port.

aplay -L

shows only one mixer (since I'm using PA) so there is no headphone1 showing up.

anymore ideas how I can find the device that I need to toggle for working speakers?

dbacc · 2014-12-11 21:51:20

no ideas?

Arch Linux

#1 2014-07-13 17:37:56

No sound from Lenovo T420 dock

#2 2014-07-16 05:01:04

Re: No sound from Lenovo T420 dock

#3 2014-07-18 11:26:50

Re: No sound from Lenovo T420 dock

#4 2014-07-18 11:48:15

Re: No sound from Lenovo T420 dock

#5 2014-07-21 03:32:31

Re: No sound from Lenovo T420 dock

#6 2014-07-21 09:39:15

Re: No sound from Lenovo T420 dock

#7 2014-07-21 22:58:49

Re: No sound from Lenovo T420 dock

#8 2014-07-21 23:30:57

Re: No sound from Lenovo T420 dock

#9 2014-07-28 03:38:45

Re: No sound from Lenovo T420 dock

#10 2014-07-28 12:50:32

Re: No sound from Lenovo T420 dock

#11 2014-12-07 16:04:10

Re: No sound from Lenovo T420 dock

#12 2014-12-11 21:51:20

Re: No sound from Lenovo T420 dock

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