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Thread: Strange Red Light In Headphone Jack MacBook 4,1

  1. #1
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    Exclamation Strange Red Light In Headphone Jack MacBook 4,1

    I was fooling around with 10.04 last night and noticed some strange red light to the side of my macbook (left). I look over and there's a red light glowing inside of the headphone jack. Insanely confused. It's not a laser so it can't be an optic headphone jack, right? Thoughts?

  2. #2
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    Re: Strange Red Light In Headphone Jack MacBook 4,1

    It's either a digital outlet port or a miniturized version of HAL 9000.

    "Open the Door, HAL"

    Get a TOSlink cable and plug it into your stereo system. It might actually work.
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  3. #3
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    Re: Strange Red Light In Headphone Jack MacBook 4,1

    Quote Originally Posted by tgalati4 View Post
    It's either a digital outlet port or a miniturized version of HAL 9000.

    "Open the Door, HAL"

    Get a TOSlink cable and plug it into your stereo system. It might actually work.
    It's a digital port. It's standard, dude.

    EDIT:
    Sorry, that came off sassier than I meant. Yes, confirmed, it is a digital port. Also, the only thing scarier than full size HAL 9000 is miniature HAL 9000

    ....or perhaps maybe just HAL.
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  4. #4
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    Re: Strange Red Light In Headphone Jack MacBook 4,1

    digital audio port. You can disable the light with alsamixer, it's something with IEC958... I don't remember. mute it with "m". If you insist, I check it on my MacBook, I am working on my Pismo now.

    maybe this will work too
    Code:
    amixer set IEC958 off
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  5. #5
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    Re: Strange Red Light In Headphone Jack MacBook 4,1

    Think its something to do with drivers on the macbook. Itll be fine

  6. #6
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    Re: Strange Red Light In Headphone Jack MacBook 4,1

    I have this happen under Mac OS X sometimes, if you put the jack not all the way in, a connection is made that triggers a "this must be an optical wire"-handler which produces the red light. And sometimes when you pull the jack out again, it stays.

    Fully inserting the jack and removing it should do the trick. Repeat a couple times if necessary, try it slower, or faster. Maybe twist a little... Okay maybe I'm describing a different insert-remove-insert-remove activity here

  7. #7
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    Re: Strange Red Light In Headphone Jack MacBook 4,1

    Quote Originally Posted by linuxopjemac View Post
    digital audio port. You can disable the light with alsamixer, it's something with IEC958... I don't remember. mute it with "m". If you insist, I check it on my MacBook, I am working on my Pismo now.

    maybe this will work too
    Code:
    amixer set IEC958 off
    This worked for me on a macbook pro 3,1 running Lucid.

    Quote Originally Posted by funkwurm
    I have this happen under Mac OS X sometimes, if you put the jack not all the way in, a connection is made that triggers a "this must be an optical wire"-handler which produces the red light. And sometimes when you pull the jack out again, it stays.

    Fully inserting the jack and removing it should do the trick. Repeat a couple times if necessary, try it slower, or faster. Maybe twist a little... Okay maybe I'm describing a different insert-remove-insert-remove activity here
    Since the red light only appeared when running Ubuntu, not OS X, this did not appear to be the problem for my case (i.e. there was not some switch that become stuck within the headphone jack since the problem seems to be software related).

  8. #8
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    Re: Strange Red Light In Headphone Jack MacBook 4,1

    Success on a 5,1 running 10.04. Thanks
    i5-650 Dual-Core 3.2GHz, 4GB DDR3, 1TB, eVGA GTX 460 *Running Ubuntu, Arch, Win7, Snow Leopard
    Aluminum Unibody, 5,1 Macbook *Running Snow Leopard, Ubuntu, Jolicloud

  9. #9
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    Re: Strange Red Light In Headphone Jack MacBook 4,1

    Quote Originally Posted by linuxopjemac View Post
    Code:
    amixer set IEC958 off
    It works with 10.04 on MackBook 6,1

    Thanks,

  10. #10
    Join Date
    Jun 2005
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    Re: Strange Red Light In Headphone Jack MacBook 4,1

    I have a MacBook 5,2 and alsamixer worked for me.
    The one to disable (with the 'm' key) was labelled: S/PDIF

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