Please post the output of:
lspci | egrep -i 'audio|s(ou)?nd|media'
lsmod | grep snd
amixer | egrep '^[^ ]|Capture'
# lspci | egrep -i 'audio|s(ou)?nd|media'
00:1b.0 Audio device: Intel Corporation 82801G (ICH7 Family) High Definition Audio Controller (rev 01)
# lsmod | grep snd
snd_hda_intel 17332 0
snd_hda_codec 137856 1 snd_hda_intel
snd_pcm_oss 38368 0
snd_mixer_oss 15200 1 snd_pcm_oss
snd_pcm 68676 3 snd_hda_intel,snd_hda_codec,snd_pcm_oss
snd_timer 20996 1 snd_pcm
snd 47012 6 snd_hda_intel,snd_hda_codec,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_timer
soundcore 9248 1 snd
snd_page_alloc 9640 2 snd_hda_intel,snd_pcm
# amixer | egrep '^[^ ]|Capture'
Simple mixer control 'Master',0
Simple mixer control 'PCM',0
Simple mixer control 'Capture',0
Capture channels: Front Left - Front Right
Limits: Capture 0 - 15
Front Left: Capture 12 [80%] [on]
Front Right: Capture 12 [80%] [on]
Simple mixer control 'Capture Mux',0
Capture channels: Front Left - Front Right
Simple mixer control 'Input Source',0
Thanks,
John