[ubuntu] Microphone doesn't work

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http://ubuntuforums.org – HI! I installed Ubuntu 9.10 on my Acer Aspire 6530G. It has a ALC888 sound card. The loudspeakers work well, but the micorphone doesn't works. I tried to check if microphone was muted (alsamixer), I increased the microphone volume to the max value but nothing changed. Can anyone help me? Sorry for my English, I'm Italian :( (Hardware)