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The problem:
The system won't play sound on the internal speaker of the laptop, but only on the headphone. When I put the headphone jack half in and fiddle around with it, then it'll play even on the internal speakers (the system apparently believes, that the headphone are in). What should I do?

The technical data:
Laptop modell Medion Erazer X6815

$ sudo aplay -l | egrep ^card
card 0: PCH [HDA Intel PCH], device 0: ALC269VB Analog [ALC269VB Analog]
card 0: PCH [HDA Intel PCH], device 1: ALC269VB Digital [ALC269VB Digital]
card 0: PCH [HDA Intel PCH], device 3: HDMI 0 [HDMI 0]

Ubuntu 12.04 64bit

$ uname -a
Linux matatabisama-X6815 3.2.0-30-generic #48-Ubuntu SMP Fri Aug 24 16:52:48 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
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I had this same problem in Ubuntu 12.04, this answer helped me to fix the problem. –  Anwar Shah Sep 23 '12 at 3:25
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