I don’t see anything obvious there. Do you know what the “External Amplifier” setting does? Out of curiousity, what happens when you toggle it OFF ?
Simple mixer control 'External Amplifier',0
Capabilities: pswitch pswitch-joined
Playback channels: Mono
Mono: Playback [on]
I also note you have master volume @ 74%, master mono @ 74%, 3D controls at 0% or OFF, PCM at 74%, … what happens when you move those levels up to 95% for testing?
What are you using for a sound test?
Note, when testing if you have sound, please copy and paste the following speaker-test into a Gnome terminal or a kde konsole:
speaker-test -Dplug:front -c2 -l5 -twav
Note Linux is case sensitive, and “D” is not the same as “d”. To stop the above test, while the konsole/xterm has the mouse focus, press on the keyboard. Note you should check your mixer settings (kmix if using KDE, and alsamixer if using Gnome) to ensure that PCM and Master Volume are set around 95%. Once you have basic sound established you can back off to lower volume levels. Note the test for surround sound is different.
If that test yields errors (and its not uncommon to get errors there), try instead this more simple test: speaker-test -c2 -l5 -twavYou should hear a female voice saying ‘FRONT LEFT’, ‘FRONT RIGHT’ five times. Its quite common that one of those speaker tests will work and one will NOT work, so don’t be distressed if that is the case. IF that test gives sound, stop now, post that the sound test gives sound, and we will look at other possible causes for your applications not giving you the sound you want (such as missing codecs, using the wrong packaged version … etc … ).
Or alternatively, for testing the simple playback, use aplay program. Prepare a WAV file and simply run like:
aplay -vv somefile.wav
With the option -vv, aplay shows the verbose information of the PCM device, and a VU-peak meter during playing the file.
Try those speaker-tests as both a regular user, and also with root permissions. If you have a headset,** try with your headset plugged in**, and also with your headset not plugged in (for speakers).