Random interruptions and short noises in sound - computer falsly detects headphones to the front jack for a second

jcz

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Jun 8, 2014
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When I listen to music on my headphones or regular speakers (both connected to the audio jack on the IO port) - I hear these weird interruptions, like a skipping sound when a CD bumps, or a short noise you hear when you're connecting speakers to something.

After some investigating, I have discovered the source of the interruptions: opening up the Sound settings in Ubuntu shows that my computer detects headphones (this is just what the software calls it) connecting at random times on the front panel, and then disconnecting the next instant - which causes the weird noises. This happens mostly irregularly - I've tried messing with the parts (shaking them a bit etc).

It even happens when there's no music playing, when it's mute, or when there's nothing conected - but I think that it's much more frequent when there's music playing. Additionally, I cannot hear the effect in Windows - but I'm rather sure that it's a hardware problem, rather than anything specific to Ubuntu, because just because I cannot hear it in Windows does not mean it's not there (Windows sound infrastructure is very different than in Linux).

The effect doesn't happen, however, when the headphones or speakers are connected in the front panel - which is what the software detects as randomly connecting when nothing is connected to it.

I was messing around with overclocking and various other settings in the BIOS. However I had returned them to Optimized Defaults in order to test this - and the effect is still there.

What could be causing this? Is my mobo fried? What can I do to correct this?

Hardware information:

Motherboard: M5A97 EVO R2.0
Processor: AMD FX-8320
OS: Ubuntu 14.04 and Windows 7 (dual boot)
Case: Zalman Z11 (could be shorting something?)

(Accidentally posted this in the Linux forum, please remove that thread.)
 

jcz

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Jun 8, 2014
11
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4,510


Thanks, I will as soon as I'm able to can.

However I don't see whether this would be definite proof that it's not the motherboard - maybe this only happens when the front jack is connected - even though it might be a totally OK jack? And the motherboard still might not work when I get a new jack.

You're the expert here - is that possible, or am I talking nonsense (hopefully I am)?
 

jcz

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Jun 8, 2014
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Hey! Just tested it. Unplugging the "HD Audio" connector of my case from the motherboard removed all the weird effects.

However, this is still very inconvenient for me (if I want to use headphones or a microphone I have to reach all the way back and unplug the speakers).

What should I do? I've been told you can't get that part separately, but I think I've lost my warranty :S
 

jcz

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Jun 8, 2014
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How do you get those things? It's a cable that goes into my case, I'm not sure I can get it out.

And if I switch the audio modes, do I need a different cable, and do I need to connect it to a different place?
 

romirez

Distinguished
Some quotes from google:
...Front panel audio design in conjunction with motherboard audio header design is dependant upon the type of audio CODEC being used on the motherboard. In the past, AC’97 Integrated Audio CODECs were prevalent. With the introduction of Intel High Definition Audio, many new motherboard designs are switching over to High Definition (HD) audio CODECs. Designers should note that AC’97 and Intel High Definition Audio front panel motherboards and I/O cards implementations are different and may not be directly compatible or interchangeable

Some sources indicate that it is/may be necessary to switch audio output modes in the BIOS configuration or with a jumper. It is recommended that you look at your motherboard manual...
5hZot.jpg
 

jcz

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Jun 8, 2014
11
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4,510


My case (Zalman Z11) only provides the HD Audio connector though. However, I think I might be able to drag over my other computer, and connect its HD Audio to my own board (having the cases next to each other) - and then see if the error is there.