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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