Problems with headphone jack and microphone quality

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I have a fresh installation of debian testing (lenny) on a Sony Viao VGN-FZ31Z.

Alsa has installed correctly but has left me with two problems.

1) The laptop speakers work fine but when i plug headphones into the laptop sound continues to come from the onboard speakers and not the headphones. Strangely enough the microphone jack does work (with problems). I have a dual boot system and the hardware works fine with my other OS.

2) The quality of the microphone is pretty bad.  When using the microphone jack I can hear a lot of hiss any only just hear my voice in the background. When using the onboad microphone i only get hiss.

Any ideas how can i go about debugging and resolving these problems?

Here is my system information...

My kernel is 2.6.24-1-686
I have debian packages installed for alsa-base and alsa-utils, both in version 1.0.16-1
 
The audio controller (output from lspci -v) is:

       00:1b.0 Audio device: Intel Corporation 82801H (ICH8 Family) HD Audio Controller (rev 03)
       Subsystem: Sony Corporation Vaio VGN-FZ260E
       Flags: bus master, fast devsel, latency 0, IRQ 22
       Memory at fc400000 (64-bit, non-prefetchable) [size=16K]
       Capabilities: <access denied>
       Kernel driver in use: HDA Intel
       Kernel modules: snd-hda-intel

The output from amixer is:

Simple mixer control 'Master',0
 Capabilities: pvolume pswitch
 Playback channels: Front Left - Front Right
 Limits: Playback 0 - 127
 Mono:
 Front Left: Playback 108 [85%] [-14.25dB] [on]
 Front Right: Playback 108 [85%] [-14.25dB] [on]
Simple mixer control 'PCM',0
 Capabilities: pvolume
 Playback channels: Front Left - Front Right
 Limits: Playback 0 - 255
 Mono:
 Front Left: Playback 185 [73%] [-14.00dB]
 Front Right: Playback 185 [73%] [-14.00dB]
Simple mixer control 'Digital',0
 Capabilities: cvolume
 Capture channels: Front Left - Front Right
 Limits: Capture 0 - 120
 Front Left: Capture 71 [59%] [5.50dB]
 Front Right: Capture 71 [59%] [5.50dB]


All help greatly appreciated.

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