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All the problems I read about were all about the sound not working when they plugged the headphones in.

I have the problem that my mic will work but the sound is still played on my built-in speakers. When I look at the sound settings, it doesn't give me any options for headphones.

I run 12.04 and never had this problem in Windows. I run it on a Acer Aspire 5920g.

Any tips or ideas will be very helpful.

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Have you checked the hardware tab in sound settings ? This lists all available devices, it may not be called just headphones but a veriation on "built in audio" – Mark Kirby Aug 15 '12 at 13:16
Ok well i got them working, but now my speakers work as well...any ideas on how to turn them off and to leave my headphones on? – Dave Chatelain Aug 15 '12 at 16:53

I had the same problem on my Acer 5930g. Even though I plugged in the earphones I hear the sound both in the built in speakers and the headphones.

Just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the commands below.

gksudo gedit  /etc/modprobe.d/alsa-base.conf

and add in this line

options snd-hda-intel enable=1 index=0 model=auto

then save and reboot.

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But this mutes the external speaker for ever! – Nitesh Verma Nov 19 '14 at 10:25

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