LinuxQuestions.org - microphone not working

My microphone is not working with skype. I don't if its the problem with the skype settings or sound settings of my Ubuntu10.04. It works fine with yahoo voice chat.
And in alsamixer, I can't edit the headphone settings, why is it so??

Also, asound-cards=
0 [NVidia ]: HDA-Intel - HDA NVidia
HDA NVidia at 0xdfff8000 irq 21
asound-version= Advanced Linux Sound Architecture Driver Version 1.0.21.

xxx@xxx:~$ amixer
Simple mixer control 'Master',0
Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
Playback channels: Mono
Limits: Playback 0 - 64
Mono: Playback 64 [100%] [0.00dB] [on]
Simple mixer control 'Headphone',0
Capabilities: pswitch penum
Playback channels: Front Left - Front Right
Mono:
Front Left: Playback [on]
Front Right: Playback [on]
Simple mixer control 'PCM',0
Capabilities: pvolume penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 255
Mono:
Front Left: Playback 255 [100%] [0.00dB]
Front Right: Playback 255 [100%] [0.00dB]
Simple mixer control 'Front',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 64
Mono:
Front Left: Playback 64 [100%] [0.00dB] [on]
Front Right: Playback 64 [100%] [0.00dB] [on]
Simple mixer control 'Front Mic',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 30 [97%] [10.50dB] [on]
Front Right: Playback 30 [97%] [10.50dB] [on]
Simple mixer control 'Surround',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 64
Mono:
Front Left: Playback 64 [100%] [0.00dB] [on]
Front Right: Playback 64 [100%] [0.00dB] [on]
Simple mixer control 'Center',0
Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
Playback channels: Mono
Limits: Playback 0 - 64
Mono: Playback 64 [100%] [0.00dB] [on]
Simple mixer control 'LFE',0
Capabilities: pvolume pvolume-joined pswitch pswitch-joined penum
Playback channels: Mono
Limits: Playback 0 - 64
Mono: Playback 64 [100%] [0.00dB] [on]
Simple mixer control 'Line',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 0 [0%] [-34.50dB] [off]
Front Right: Playback 0 [0%] [-34.50dB] [off]
Simple mixer control 'CD',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 25 [81%] [3.00dB] [on]
Front Right: Playback 25 [81%] [3.00dB] [on]
Simple mixer control 'Mic',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 0 [0%] [-34.50dB] [on]
Front Right: Playback 0 [0%] [-34.50dB] [on]
Simple mixer control 'IEC958',0
Capabilities: pswitch pswitch-joined cswitch cswitch-joined penum
Playback channels: Mono
Capture channels: Mono
Mono: Playback [off] Capture [off]
Simple mixer control 'IEC958 Default PCM',0
Capabilities: pswitch pswitch-joined penum
Playback channels: Mono
Mono: Playback [on]
Simple mixer control 'Beep',0
Capabilities: pvolume pswitch penum
Playback channels: Front Left - Front Right
Limits: Playback 0 - 31
Mono:
Front Left: Playback 0 [0%] [-34.50dB] [off]
Front Right: Playback 0 [0%] [-34.50dB] [off]
Simple mixer control 'Capture',0
Capabilities: cvolume cswitch penum
Capture channels: Front Left - Front Right
Limits: Capture 0 - 31
Front Left: Capture 31 [100%] [33.00dB] [off]
Front Right: Capture 31 [100%] [33.00dB] [off]
Simple mixer control 'Capture',1
Capabilities: cvolume cswitch penum
Capture channels: Front Left - Front Right
Limits: Capture 0 - 31
Front Left: Capture 9 [29%] [0.00dB] [off]
Front Right: Capture 9 [29%] [0.00dB] [off]
Simple mixer control 'Channel Mode',0
Capabilities: enum
Items: '2ch' '6ch'
Item0: '2ch'
Simple mixer control 'Input Source',0
Capabilities: cenum
Items: 'Mic' 'Front Mic' 'Line' 'CD'
Item0: 'Mic'
Simple mixer control 'Input Source',1
Capabilities: cenum
Items: 'Mic' 'Front Mic' 'Line' 'CD'
Item0: 'Mic'