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My internal speaker was working before I updated(including new kernel) a few days ago. Now it seems that my internal speaker is muted and only external speakers are working . I am using ubuntu 10.10 with my dv6000 laptop. I tried to fix the problem with alsamixer and it looks like I don't have my speaker muted. When I check from problems in Preferences -> Sound I am getting :

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Would you please start gnome-volume-control and check the tab "Output"? – desgua Mar 27 '11 at 3:42
Ya I did check gnome-volume-control . Output is not muted. – Prabesh Shrestha Mar 27 '11 at 7:11
And in that tab ("Output") what devices you have that you can choose? – desgua Mar 28 '11 at 0:14
@desgua I have edited my question to add the screenshots . Thanks. – Prabesh Shrestha Mar 28 '11 at 1:32

Would you please try this on a terminal:

 sudo alsaconf
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I am getting the error sudo: alsaconf: command not found – Prabesh Shrestha Mar 28 '11 at 12:36
I'm on my mobile right now, but I think this may help: – desgua Mar 28 '11 at 15:23

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