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I'm running Ubuntu on a Toshiba C660 (4GB RAM, Intel Core i5). My soundboard is integrated and after trying to play a song on youtube my volume is muted. I can't unmute it (appears like it's unmuted , but it's mute)

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up vote 1 down vote accepted

Try this:

sudo killall pulseaudio
sudo alsa force-reload
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didnt work for me. – tony gil Nov 19 '12 at 14:38

I had a similar problem, I just recently upgrade from 11.10 to 12.04 . In my case i was able to hear sound on System -> Sound -> Test Sound. But I couldn't hear a sound on youtube or while playing mp3's on rhythmbox.

I followed instruction at solution for 12.04 And now everything is back to normal.

I hope it helps



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it works now. i restarted my pc and it worked. but it seems its doing this constantly. ill follow the instructions you gave me :) thanx ! – Matei May 3 '12 at 8:59
My Dell XPS 17 (l702x) displays the same behaviour under 12.04 (no video sound, test sound in applet OK). I'll try the instruction at the link above, it's a shame that they look so lengthy and involved (oh well). Cheers, Rich. – Big Rich Sep 5 '12 at 13:40
18 steps to fix audio? and, in the end, audio STILL doesnt work. ubuntu will be a great OS, once it is ready. if you're not a total geek, ubuntu is at best a backup system for when windows crashes or you are navigating high-risk seas. – tony gil Nov 19 '12 at 14:35

Given your sparse information and my limited knowledge on the topic, I can only offer a possible solution from my own experience: pulseaudio and flash do seem to cause problems from time to time. Killing one or the other solves this problem often for me: e.g.

run pkill pulseaudio in a terminal and then reload the youtube video.

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thank you :) its not only on youtube. if i open a player it doesnt work either :) – Matei May 3 '12 at 9:00

i had the same problem with you tube video sound.there was an x next to the speaker icon beneath the video which i could not get rid of.i finally clicked on to the icon and dragged it to the right and the sound came back.

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