internal michrophone not working

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http://askubuntu.com – the internal microphone of my COMPAQ Presario CQ60 is not working. i notice it when calling on skype i could not be understood. i checked if skype was disabling my microphone due to its auto regulator, but that wasn't the problem. i controlled the audio option and when i notice that the microphone does not detect any sound in the previous version of ubuntu i did not have any issue with the microphone. can you help me? let me know if you need any particular information thanks (HowTos)