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  1. #1
    Volume buttons on iMac keyboard dont work when audio jack plugged in

    Member Since
    Jun 26, 2012
    Posts
    3
    Unhappy Volume buttons on iMac keyboard dont work when audio jack plugged in
    Hi all
    I recently bought an audio cable (Toslink to Mini Digital Optical SPDIF Audio Cable) to connect from my iMac to my surround sound system. The 3.5mm analog end of the cable goes in to the computer's audio out and the optical/digital end goes into the speaker port. The wire works fine but once i connect this "analog-to-digital" cable, the volume up and down buttons on keyboard dont work. Also the volume icon on the menubar on the top of the screen is shown disabled. Can anyone please suggest me some solution to this situation.

    If you need to see what type of wire it is, you can check the wire here.
    StarTech.com THINTOSMIN6 Toslink to Mini Digital Optical SPDIF Audio Cable, 6-Feet (Black): Amazon.ca: Electronics

    Thanks in advance
    Sazzad

  2. #2
    Volume buttons on iMac keyboard dont work when audio jack plugged in

    Member Since
    Jun 26, 2012
    Posts
    3
    Volume buttons on iMac keyboard dont work when audio jack plugged in
    Hi all
    I recently bought an audio cable (Toslink to Mini Digital Optical SPDIF Audio Cable) to connect from my iMac to my surround sound system. The 3.5mm analog end of the cable goes in to the computer's audio out and the optical/digital end goes into the speaker port. The wire works fine but once i connect this "analog-to-digital" cable, the volume up and down buttons on keyboard dont work. Also the volume icon on the menubar on the top of the screen is shown disabled. Can anyone please suggest me some solution to this situation.

    If you need to see what type of wire it is, you can check the wire here.
    StarTech.com THINTOSMIN6 Toslink to Mini Digital Optical SPDIF Audio Cable, 6-Feet (Black): Amazon.ca: Electronics

    Thanks in advance
    Sazzad

  3. #3
    Volume buttons on iMac keyboard dont work when audio jack plugged in

    Member Since
    Jul 15, 2009
    Location
    In front of MY MAC OR LINUX BOX
    Posts
    211
    Specs:
    Mac Pro Workstation Airport Extreme ATV 2 Ipad
    I might be wrong .
    But if I search for that cable on the internet it is standard optical cable .
    So once use it from optical out to optical in
    Controlling the volume happens on the analog side of the optical in

  4. #4
    Volume buttons on iMac keyboard dont work when audio jack plugged in

    Member Since
    Jun 26, 2012
    Posts
    3
    Thanks Dobby. Although i am not very clear on what you said. the cable is optical for sure. but the two ends are different. the audio out port (not optical port as imac does not have optical port) supports the standard 3.5 mm minijack. the jack at the other end is optical and also goes into an optical port. Its like a cable without having to use a converter between analog and digital ports. But i dont get how that disables my volume option in the computer. once i use the normar RCA cable, the volume option comes back again. Please let me know if i am missing something and is there any way to fix it up.

  5. #5
    Volume buttons on iMac keyboard dont work when audio jack plugged in
    mrplow's Avatar
    Member Since
    Oct 01, 2007
    Location
    UK
    Posts
    6,759
    Specs:
    27" iMac i7 (2011) 10.10, iPhone6, iPad Air 2, AppleTV2
    That's because the optical signal you're sending isn't modified by your Mac. It's a fixed, un-amplified digital stream. It's just data. It's down to the receiver to interpret, convert, amplify, output the signal.
    External hard disk acquisition addict - but admitting the problem is the first step to a robust backup

    Please use the reputation system if you think you've been helped - top right of this post

  6. #6
    Volume buttons on iMac keyboard dont work when audio jack plugged in
    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
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    45,191
    Specs:
    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, Yosemite
    @MSH

    Please do not cross post or double post. Post your question once and to the same forum. Be patient and wait for an answer. Thanks.

  7. #7
    Volume buttons on iMac keyboard dont work when audio jack plugged in
    mrplow's Avatar
    Member Since
    Oct 01, 2007
    Location
    UK
    Posts
    6,759
    Specs:
    27" iMac i7 (2011) 10.10, iPhone6, iPad Air 2, AppleTV2
    Quote Originally Posted by MSH View Post
    the audio out port (not optical port as imac does not have optical port) supports the standard 3.5 mm minijack.
    Your iMac does have an optical port, your using it. The 3.5mm jack is both stereo analogue and digital optical. It auto switches depending on what you connect to it.

    Optical cables can have two different connector types - a 3.5mm jack with a tiny hole in the tip for the optical connection and the small square jack with the two angled corners that you typically find on receivers/amps/cable boxes etc.

    once i use the normar RCA cable, the volume option comes back again
    That's because the analogue out from this cable is analogue and pre-amplified by your Mac - hence you have control over the volume
    External hard disk acquisition addict - but admitting the problem is the first step to a robust backup

    Please use the reputation system if you think you've been helped - top right of this post

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