Dell Mini 9 OS X Discussion Discussion for installing and setting up Mac OS X on the Dell Mini and Vostro A90
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Join Date: Dec 2009
built-in speakers hiss when headphones are plugged in - 12-24-2009, 06:40 PM
I've seen some posts on mydellmini and on other forums regarding this issue on ubuntu, but nothing on this subforum.
the problem -
When I plug in my headphones, a static hiss comes out of the internal built-in speakers below the LCD on the mini 9. There's no clicks or beeps, it sounds just like white noise or AM radio static, and it's about as loud as a spooled-up cpu fan would be on an average notebook. The speakers work fine for playing audio when the phones aren't plugged in, and the headphones sound fine when playing audio otherwise (with no significant hiss coming from the phones themselves, only the speakers). If headphones are plugged in at boot, the hiss only starts until after OS X has started up (presumably after the audio device is initialized in the kernel).
-While sleeping, there's no hiss of course, but once it wakes up the hiss comes back.
-If I mute (while headphones are plugged in) the hiss goes away for the duration of the mute, but once I unmute (headphones still in) the hiss from the internal speakers comes back
- The speaker hiss stops when I remove the headphones, and audio plays back normally through the internal speakers. But once I plug the phones back in, speaker hiss resumes.
Is there a way to disable the built in speakers on the mini9 either through os x or a hidden bios setting? Even though I use them exceedingly rarely, I don't want to just cut the wires to the internal speakers permanently or try to unsolder the wires (seems a bit drastic)
(the only other option I could think of is to use the headphone out from a USB soundcard, which works fine)
seems like the problem is not isolated to the mini 9, and happens on some other dells/brands of notebooks, so I wonder if its a hardware issue that happens on specific computers with this particular onboard soundcard (someone on another thread suggested it may be some weird grounding or biasing issue). I've also had this problem on my mini9 under moblin 2.1, but since it's a problem under ubuntu as well, I can't be entirely sure it's a hardware issue and not a software issue that exists simultaneously for both OS X and the current linux audio stack.
Audio hiss on Ubuntu Karmic (9.10)
associated bug track:
[Bug 480456] [NEW] Dell mini 9 speakers hiss when headphones are plugged
Mini9 with 10.6.2, STEC 16gb, working sleep, NBI .8.3 RC5
Join Date: Feb 2009
Location: Colorado, USA
12-24-2009, 07:16 PM
Known bug, It's due to the way AppleHDA turns on / off the speaker, I'll be working on it, but the fix won't be in the 0.8.3 release.
Join Date: Mar 2009
05-28-2010, 06:48 AM
easily fixed .
in this thread
Sound and mic working with AppleHDA
Join Date: Jul 2010
Location: Cheshire, UK
11-26-2011, 01:44 PM
I've got the same problem. I tried to install VoodooHDA 2.7.2 as suggested but this just gives me a kernel panic and I can't boot.
I'm running 10.6.7. I've reinstalled multiple times and updated from 10.6 to 10.2, 10.4, 10.7 to see if that made any difference (it didn't).
Any other suggestions?
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