Discussion:
Ubuntu 12.04.1 - wmmixer : Unable to open mixer device /dev/mixer'.
Csányi Pál
2012-09-01 16:04:55 UTC
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Hi,

I have installed Ubuntu 12.04.0 LTS.

I purge everything that is related to Unity Desktop: unity, nautilus,
gnome stuff, etc.

Now I'm using Window Maker and want to run wmmixer but get error
message:
wmmixer : Unable to open mixer device /dev/mixer'.

My username is a member of the audio group.

What can I do to solve this problem?
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Tobia Tesan
2012-09-01 16:09:24 UTC
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Post by Csányi Pál
Hi,
I have installed Ubuntu 12.04.0 LTS.
I purge everything that is related to Unity Desktop: unity, nautilus,
gnome stuff, etc.
Now I'm using Window Maker and want to run wmmixer but get error
wmmixer : Unable to open mixer device /dev/mixer'.
if I am not mistaken, /dev/mixer is (was?) OSS only, whereas ALSA,
installed by default on 12.04 (and pretty much any other distro by now),
has its own stuff in /dev/snd/*.

I guess you would need to patch wmmixer or enable OSS emulation for ALSA.

See if this helps you:

https://help.ubuntu.com/community/alsa-oss
http://alsa.opensrc.org/OSS_emulation
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Tobia Tesan
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Csányi Pál
2012-09-01 16:19:06 UTC
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Sat, 01 Sep 2012 18:09:24 +0200 -n
Post by Tobia Tesan
Post by Csányi Pál
Hi,
I have installed Ubuntu 12.04.0 LTS.
I purge everything that is related to Unity Desktop: unity,
nautilus, gnome stuff, etc.
Now I'm using Window Maker and want to run wmmixer but get error
wmmixer : Unable to open mixer device /dev/mixer'.
if I am not mistaken, /dev/mixer is (was?) OSS only, whereas ALSA,
installed by default on 12.04 (and pretty much any other distro by
now), has its own stuff in /dev/snd/*.
I guess you would need to patch wmmixer or enable OSS emulation for ALSA.
https://help.ubuntu.com/community/alsa-oss
http://alsa.opensrc.org/OSS_emulation
OK, using advice in
https://help.ubuntu.com/community/alsa-oss

I have installed alsa-oss
and can start wmmixer with the 'aoss wmmixer -w' commnad,
but I can't to use it!

Say, I can't to adjust volume..
Why?
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Csányi Pál
2012-09-01 16:34:32 UTC
Permalink
Sat, 01 Sep 2012 18:09:24 +0200 -n
Post by Tobia Tesan
Post by Csányi Pál
Hi,
I have installed Ubuntu 12.04.0 LTS.
I purge everything that is related to Unity Desktop: unity,
nautilus, gnome stuff, etc.
Now I'm using Window Maker and want to run wmmixer but get error
wmmixer : Unable to open mixer device /dev/mixer'.
if I am not mistaken, /dev/mixer is (was?) OSS only, whereas ALSA,
installed by default on 12.04 (and pretty much any other distro by
now), has its own stuff in /dev/snd/*.
I guess you would need to patch wmmixer or enable OSS emulation for ALSA.
https://help.ubuntu.com/community/alsa-oss
http://alsa.opensrc.org/OSS_emulation
sudo modprobe snd-mixer-oss

solve the problem.

After that I can start wmmixer with the command:
wmmixer -w

and it works.

So to get this setup permanent, I must to edit
/etc/modules

and put into it the line
snd-mixer-oss

Problem SOLVED! Thanks!
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