See the Input tab of sound preferences; you need to set it to Line.
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[Realtek ALC883] Recording problem
https://bugs.launchpad.net/bugs/668087
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Public bug reported:
The line in doesn't work after config almixer. I cannot record my guitar
using line in. The microphone works poorly with low level and much
noise.
ProblemType: Bug
DistroRelease: Ubuntu 10.10
Package: alsa-base 1.0.23+dfsg-1ubuntu4
ProcVersionSignature: Ubuntu 2.6.35-22.35-ge
