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Old 10-03-2008, 09:45 AM   #1
jf.argentino
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Strange sound fade off as soon as I plug a headpone


Hello there,

I have a strange issue with my sound system under linux. Everything works well until I plug my headphone in. Then I can heard the sound slowly fading off, and then no sound anymore, even if I unplug the headphone! The only way to get it back is to reboot my computer!

The result of alsainfo can be read there: http://pastebin.ca/1218037

I'm under FEDORA core 8, and I have the same behaviour with the last kernel (2.6.26.5-28).

Is there a way to reset alsa without rebooting the system, since removing the modules one by one is really a pain in the ass!

Can somebody give me an advice, where to look at?

I need music so please don't let me in the dark...

Thanks
 
Old 10-03-2008, 11:15 AM   #2
marozsas
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it is a long shot, but try "alsactl store/restore" commands.
 
Old 10-03-2008, 11:39 AM   #3
jf.argentino
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Thanks for your reply,
I didn't says that I've already tried alsactl store /restore without success (I mean no sound after alsactl), and playing with alsaunmute and alsamixer don't bring me back my music...
 
Old 10-03-2008, 12:12 PM   #4
ronlau9
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Does it only happens with Fedora ?
Or do you use other distros too ?
If so what happens there ?
If you change the loudspeaker by a headphone you change load on the amplifier if it has no effect with the other distros than it has nothing to with load change and than it is a Fedora problem
 
Old 10-03-2008, 12:38 PM   #5
jf.argentino
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Quote:
Does it only happens with Fedora ?
My box is a linux only box, she's allergic to other OS's, and I don't want install another OS just to try it...
Quote:
f you change the loudspeaker by a headphone you change load on the amplifier
I'm not sure to understand what you mean there. By the way, I plug the headphone in its own plug, and when it's plugged, the loudspeaker automagicaly mute, as expected. And if I unplugged the headphone, normally the sound must come back to the loudspeakers. The last time I try this, there's maybe 2 or 3 weeks, it works...
 
Old 10-03-2008, 11:53 PM   #6
ronlau9
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Quote:
Originally Posted by jf.argentino View Post
My box is a linux only box, she's allergic to other OS's, and I don't want install another OS just to try it...

I'm not sure to understand what you mean there. By the way, I plug the headphone in its own plug, and when it's plugged, the loudspeaker automagicaly mute, as expected. And if I unplugged the headphone, normally the sound must come back to the loudspeakers. The last time I try this, there's maybe 2 or 3 weeks, it works...
Well a loudspeaker has a resistance somewhere between 4 to 8 Ohm
By headphone it depends totally on the way the headphone is constructed
One of the ways is to make a high impedance headphone , most amplifiers can deal with this type of headphones .
A other type of headphone is a electro dynamic headphone , the resistance
of this type of headphone is somewhere between 0 - 100 Ohm a good amplifier can deal with type too
There are also headphones that works as a compromise of this to types
 
Old 10-06-2008, 02:38 AM   #7
jf.argentino
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OK, thank you for the electronic tutorial, but, my computer have an output for headphones, which is different than the output for loudspeaker... More over, while it's true that loudspeaker have a low impedance input, remember that what you plug onto your computer is amplified loudspeaker, so their input are most likely a high impedance input...

It's certainly a software issue, but I don't know alsa very well, and I have to search in that direction, if you know how alsa deal with the headphone detection, I'll be happy to have some advice for that.
 
Old 10-06-2008, 11:42 PM   #8
ronlau9
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Do not use a headphone , but Kmix >switches there is a option headphone
do not know what it does .
 
  


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