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There is no sound output when I try to play music or videos etc.

When I run

$ speaker-test

I get

speaker-test 1.0.25

Playback device is default Stream parameters are 48000Hz, S16_LE, 1
channels Using 16 octaves of pink noise 
ALSA lib confmisc.c:768:(parse_card) cannot find card '0'
ALSA lib conf.c:4241:(_snd_config_evaluate) function snd_func_card_driver returned error: No such file or directory
ALSA lib confmisc.c:392:(snd_func_concat) error evaluating strings
ALSA lib conf.c:4241:(_snd_config_evaluate) function snd_func_concat returned error: No such file or directory
ALSA lib confmisc.c:1251:(snd_func_refer) error evaluating name
ALSA lib conf.c:4241:(_snd_config_evaluate) function snd_func_refer returned error: No such file or directory 
ALSA lib conf.c:4720:(snd_config_expand) Evaluate error: No such file or directory ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM
default Playback open error: -2,No such file or directory

lspci says my sound card is

00:11.5 Multimedia audio controller: VIA Technologies, Inc. VT8233/A/8235/8237 AC97 Audio Controller (rev 60)
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What exact programs are you trying to use to play sound? What desktop environment are you using? Is pulseaudio running (try ps -ef | grep pulseaudio)? What files are in /dev/snd directory? –  allquixotic Oct 11 '13 at 20:24
    
normally i use things like Banshee, Firefox or VLC to play audio, but nothing is working right now. I'm using Gnome 3.4.2.1 (classic mode). Pulseaudio is running. '/dev/snd' contains "seq" and "timer" –  BillDAWG Oct 11 '13 at 21:02
    
The snd-via82xx driver should have been loaded automatically. Any error messages in the system log when you unload and reload it? –  CL. Oct 11 '13 at 22:15
    
How do I do that? –  BillDAWG Oct 11 '13 at 22:23
    
The absence of something like /dev/snd/pcmc0d0p suggests that the sound driver is not detecting your sound card properly. This is likely a bug in ALSA, or the support was removed because the hardware is so old (this latter part is unlikely, because ALSA generally doesn't remove hardware support). What kernel version are you running? Output of uname -a? –  allquixotic Oct 12 '13 at 1:36

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