HW mute / LED on HDX16 - details and ... Linux

Hello HP forum,
are there details on the HW logic fo muting ?
On Linux the mute key is working but is only controlling SW mute. So the driver sets volume internally
to "0", marks the icons as muted, but does NOT mute the HW. So the mute LED on the HDX16 stays
white and does not change to orange.
Further an OS reboot leads to "klicking" noises, because the HW mute was not activated correctly.
What is the logic behind this mute logic ?
Is this an I/O port ? Is this a sound chip feature (e.g. speaker on/off or amp on/off) ??
How can this be controlled ?  (HW details if possible, I/O port, ....)
I would like the use HDX16 fully under Linux, even if I have to do driver development.
Open points under Linux:
Validity fingerprint sensor
ENE CIR remote control
HW mute/LED
Audio problems in general together with DVB-T
Rest is super !!!
chris71

HW mute LED is working for me !!
My updated code is part of the LINUX 2.6.30 kernel, currenlty available as 2.6.30-rc6.
Further I did technical analysis.
The MUTE LED is connected to the GPIO-3 pin of the Codec chip IDT 82xx71.
 I currently use 2.6.29 with my own patch under Ubuntu 9.04 and it works great.
Chris71

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