[alsa-devel] Strange sound of IDT 82hd206xx6 at font port in AC97 mode

[Randy Li]

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于 2014年02月04日 07:08, Raymond Yau 写道:

> Check the front audio connector of your motherboard in the user
> manual
> 
> Check the front audio panel specification of your computer chassis 
> whether support Jack detection of headphone and mic
> 
> Only a few multi channel AC97 2.3 codecs (e.g. ALC850) support
> jack detection and most AC97 front audio panel does not have jack
> detection circuit
> 
> http://www.intel.com/support/motherboards/desktop/sb/cs-015851.htm
> 
>> I can't hear the sound in some part of a film and I can hear the 
>> stranger accent of sound in the other part of a film(or a music).
>> But all the 7.1 channel in the back ports can output the sound
>> match my mircophone(all are the same).
> 
> The front audio panel headphone share the front channel signal only
> when playing multi channel audio
> 
> You need  to use applications（e.g  mplayer） which can  down mix
> multi channel to stereo or select the stereo track  instead of DTS
> of movie DVD when you are using headphone
> 
I find the other thing, this headphone is for android mobile which
combine controller, headphone and speaker. If you don't plug it into
font port fully, it works.
I have tested a nornal headphone, it works too.

Maybe it cause by my hardware, it is not alsa's problem.


Thank you
ayaka
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