Two days ago, I started my computer and couldn't get a sound out of a video file I was reading seconds ago on my laptop. I thought I didn't have the right codec installed to read the sound track of this avi file and got back to my laptop.
Today, I found out sound wasn't working at all. Can't listen to MP3s in XMMS, no sound when clicking on the test button in the sound manager of Ubuntu even though it detects my sound device...
I checked the general sound controller in the notification area is not mute. I checked my speakers weren't dead (used headset)... no clue.
I googled "ubuntu no sound" and the first result saved my day: Ubuntu No Sound Troubleshoot.
As this blog note proposes, I ran the alsamixer and found out the PCM was mute. Problem solved !
to mute/unmute : m
to exit and save: Esc
to save permanently, in term : sudo alsactl store
Thank you guy-who-wrote-this-blog-note.
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