In my user account, I have no sound.
As su my sound works great when I use the alsa tests:
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debian:/home/bob# speaker-test -Dplug:surround51 -c6 -twav
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debian:/home/bob# debian:/home/bob# aplay ring.wav
Playing WAVE 'ring.wav' : Signed 16 bit Little Endian, Rate 44100 Hz, Stereo
But as user I get:
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bob@debian:~$ speaker-test -Dplug:suround51 -c6 -twave
speaker-test 1.0.20
Playback device is plug:suround51
Stream parameters are 48000Hz, S16_LE, 6 channels
WAV file(s)
ALSA lib pcm.c:2211:(snd_pcm_open_noupdate) Unknown PCM suround51
Playback open error: -2,No such file or directory
ALSA lib pcm.c:2211:(snd_pcm_open_noupdate) Unknown PCM suround51
Playback open error: -2,No such file or directory
ALSA lib pcm.c:2211:(snd_pcm_open_noupdate) Unknown PCM suround51
Playback open error: -2,No such file or directory
ALSA lib pcm.c:2211:(snd_pcm_open_noupdate) Unknown PCM suround51
Playback open error: -2,No such file or directory
ALSA lib pcm.c:2211:(snd_pcm_open_noupdate) Unknown PCM suround51
Playback open error: -2,No such file or directory
ALSA lib pcm.c:2211:(snd_pcm_open_noupdate) Unknown PCM suround51
Playback open error: -2,No such file or directory
^C
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bob@debian:~$ aplay -vv ring.wav
ALSA lib pulse.c:272:(pulse_connect) PulseAudio: Unable to connect: Connection refused
aplay: main:608: audio open error: Connection refused
bob@debian:~$