Re: Interesting audio problem
David Niklas wrote:
> On Thu, 30 Jun 2016 09:44:53 deloptes <deloptes@gmail.com>
>> David Niklas wrote:
>>
>> > On Tue, 28 Jun 2016 10:48:12 deloptes wrote:
>> > Thanks all, deloptes questioned me the most thoroughly so I'm
>> > replying to him.
>> >
>> >> David Niklas wrote:
>> >>
>> >> > Hello,
>> >>
>> >> Hi David,
>> >>
>> >> > I'm not running debian, rather Gentoo, but this happens with any
>> >> > distro and sound card (so far), so I figured this is as good a
>> >> > place as any to start (though linuxquestions is a close second).
>> >> >
>> >> > My sound card is currently (according to lspci), an ATI/ATI SBx00
>> >> > Azalia (Intel HDA), though I used another ATI card on another MB
>> >> > before the MB broke (the MB was a lemon). Both cards are built into
>> >> > the MB.
>> >> >
>> >> > The said problem also happens independent of the audio playing app.
>> >> >
>> >> > The problem is this, if I plug an audio jack for my headphone into
>> >> > the jack the whole way then I get a lot less volume on the
>> >> > channels. I don't think it's a decrease in the bass, though it
>> >> > might be.
>> >> >
>> >> > Now, if I pull the headphone jack out, just a bit, it plays
>> >> > everything fine.
>> >> > ***********
>> >> > This is a little odd, and I might just dismiss it as a random
>> >> > quirk of my machine, but now it has happened to my laptops
>> >> > headphone jack too.
>> >> *************
>> >> Did you try with different cables/jacks? What type of jack is it -
>> >> perhaps you soldiered yourself, or perhaps some special headphones -
>> >> just asking? In my opinion it might be either hardware - jack is
>> >> shortening, or some odd setting somewhere, but if latter it wouldn't
>> >> be same on different board. Anyway for the case it is not the jack
>> >> itself we would need some additional info. In debian
>> > Yes, I'm pretty certain that this is a hardware problem. I've tried
>> > different headphones to no avail. The jack is built into the MB.
>> > I was curious if others have experienced this, maybe all I have to do
>> > is open the plastic jack case on the MB and adjust something. I'd try
>> > this without your help but I, frankly, don't know if it would
>> > work/what I'm doing and I want to know what I'm doing when messing
>> > with the MB.
>>
>> What we meant was not the female jack on the board, but the male jack of
>> your head phones or amplifier. Some vendors do not follow the standards
>> (like Apple).
>> The female jack on the board should be standard though - unless you use
>> some exotic hardware.
>>
>> >
>> > <<From the laptop since it's going to be shorter.>>
>> >> cat /proc/asound/cards
>> > 0 [PCH ]: HDA-Intel - HDA Intel PCH
>> > HDA Intel PCH at 0xc0610000 irq 28
>> >> cat /proc/asound/card*/codec*
>> >> cat /var/lib/alsa/asound.state
>> >>
>> >> Please attach or upload somewhere.
>> > They are attached
>> >
>>
>> This is well known Codec: Realtek ALC282
>> I'm just not sure if you have Line-In jack there. I mean if you can
>> record stereo from external source.
>> This would explain why you hear only one line. You can check easily the
>> specs of your mainboard. I couldn't find stereo capture and I'm not an
>> expert.
>>
>> I found this here
>>
http://mailman.alsa-project.org/pipermail/alsa-devel/2014-January/071161.html
> I'd have to look at this later, it's a bit beyond me at first glance.
>
>> Could be that you need to try recent kernel version
> As I mentioned, this did not occur when I fist used my computer (brand
> new, see the part above with stars), and as I've had this problem for
> 3.18 -- 4.1 of the linux kernel on my laptop and 2.6 -- 4.1 on my desktop
> I hardly think it's a matter of upgrading.
>
>From what I understood, your original problem was with files you recorded
yourself and from what I saw I could not conclude you have a stereo line in
jack
>> >>
>> >> Another option would be a setting to turn off speaker when you plugin
>> >> headphones.
>> > Why? And there are not speakers, at least on my desktop. The laptop
>> > speakers I mute when using headphones, they used to auto mute, but now
>> > the computer thinks the hp are always attached so I turned that off.
>> >
>> >> >
>> >> > Also, I've recorded some audio from an old cassette tape onto my
>> >> > computer (cassette tape players are getting hard to find), and some
>> >> > of the said audio I somehow got to require that the headphone jack
>> >> > be fully plugged in to play correctly. [scratches head] I with I
>> >> > knew how I did this, it's really odd.
>> >> >
>> >>
>> >> There is no connection between these two. What means correctly?
>> > There is a Microphone and "Line in" jack on my desktop and a line out
>> > on the player (wasn't this kinda obvious?).
>> >
>> >> > So, my questions are:
>> >> > 1: What causes this?
>> >> > 2: How might I rerecord the audio files so they play right on a
>> >> > computer without this problem without using the now broken tape
>> >> > deck?
>> >>
>> >> It's just like normal recorder - set up input output level and
>> >> record. If your mixer or pulseaudio are not set up properly you
>> >> could have issues with the volume. I would check both. There are
>> >> also cases where the settings for specific audio chips are broken or
>> >> misaligned - it might also need attention. Just post the specs of
>> >> your audio card and setup and there will be perhaps someone with the
>> >> same who could compare and share
>> >>
>> >> regards
>> > I thought of that, but I'm not certain how to tell the computer
>> > whether to record what the computer is playing (don't want), vs.
>> > telling it to record from the Mic/line in.
>>
>> You can do this in the mixer with the switch settings - I think probably
>> pulse audio or the mixer of your distro.
> Yeah, I probably could google this under the lines of "How to turn off/on
> audio looping in alsa"
> This looks promising:
> http://alsa.opensrc.org/Jack_and_Loopback_device_as_Alsa-to-Jack_bridge
>
I don't understand what this has to do with your original problem. Jack is a
(simply explained) software that you can use to manipulate audio
in/outputs.
I think you are generally mixing mic with line in. Mic is mono. Line in is
stereo. Sometimes or more often it is combined in one where the last pin is
the mic. The middle pin gets shorted when you plugin in mic, but I have not
seen in your posting you have actually a stereo line in. So in theory it
could be that you are recording mono and when pushing the jack further in
you bridge the two output lines. I have no other explanation - perhaps I
lack imagination.
Last option is a driver mapping issue. Did you try with recent kernel as
advised?
regards
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