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Headphone / Speaker Jack Produces Distorted Audio
When I plug headphones into my headphone jack, the sound is distorted on my Latitude D830. The headphones I am using are good headphones so that is not the issue. They sound great out of any other device, including my brother's D820.
After uninstalling the SigmaTel HD Audio Device CODEC driver and re-installing it, I discovered that if the headphones are in when the re-install takes place, the headphone audio is great. However, as soon as I unplug my headphones, the next time I plug them in the distortion is back.
I also tried something else. I opened the playback devices window and played the same audio file over and over and watched the audio level. With headphones unplugged the meter shows a nice, high level. When I plug headphones in the quality is good for a split second, but as soon as it realizes the headphones are plugged in the audio level immediately drops and becomes distorted. The meters also show a much lower level. Is there a way I can get good audio from the headphone jack all the time?
khatarnak
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August 3rd, 2007 14:00
MLabuda
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August 3rd, 2007 17:00
Jim Coates
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August 4th, 2007 00:00
It is the STAC 92XX C-Major HD.
For XP it is the R153908 (5.10.0.5401)
Vista is the R153910 (6.10.0.5407)
To see drivers for other OS's, find the OS in the dropdown box in the links.
Jim
MLabuda
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August 4th, 2007 01:00
Message Edited by MLabuda on 08-03-2007 10:06 PM
Jim Coates
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August 4th, 2007 11:00
About whether it's a software problem. The jacks in the models with the STAC92xxHD chip use Universal Jacks technology. These 'sense' a plug insertion and reconfigure the jack accordingly. I believe this is based on impedance sensing. The input jack can configure between line-in and mic-in, and the output jack between line-out and headphone. And the jacks' usage can be reassigned entirely. Sigmatel (which is now made by IDT)calls this 'retasking'.
The sensing part of this is electronic, and the reconfiguration part is software that is triggered by the sensing, so it's complicated. I believe a software issue here can be caused by a sensing malfunction.
I don't know if that is the case in your situation, but it could be that when you install a driver the configuration is properly set, but becomes misconfigured when replugging causes a bad sensor circuit to trigger an incorrest configuration. If the jack is reconfiguring as line-out and shuts off the headphone amplifier, it could result in a low signal, but I don't know why it would distort. One would suspect distortion as a result of too much gain.
Normally I'd say to run the audio test part of Dell Diagnostics to confirm that there is a hardware problem, but we have seen that these Universal Jacks can cause a false result in Diagnostics. That is because Diagnostics operates in dos, outside of Windows, where a software misconfiruation is irrelevant even though it is caused by hardware. So the audio test can pass in Diagnostics, correctly signaling a software problem, but missing that a hardware problem is the root cause. In these instances the only reliable diagnostic procedure might be to try a new motherboard. In other words, it can be tough to diagnose.
Anyway, just something to think about if you can't find a software solution.
Jim
MLabuda
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August 4th, 2007 17:00
Message Edited by MLabuda on 08-05-2007 06:26 PM
rigneri
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December 18th, 2011 22:00
As ridiculous as this sounds, I stubled upon a remedy from a fellow blogger. In order to fix the sound on my Dell Inspiron laptop, power it down, then PULL THE BATTERY for 10 seconds, restart the computer, problem solved... for real!
Up to that point, I literally spent two days unistalling and reinstalling software and hardware, then 4 hours on the phone with a third party support service, who insisted it was defective hardware. My persistence in seeking a solution paid off, and in this case unbelievably simple.
Headphones now work well also! Give it a try!