bigdave1357

Q: El Capitan intermittent USB multi-media

I use a pair of Bowers & Wilkins MM-1 speakers which have worked flawlessly through several revisions of OSX.

 

Having just upgraded to El Capitan I now find that my Macbook Pro will often fail to recognise them. I have my speakers plugged into the USB port on a Thunderbolt display and I find that having disconnected my Macbook from the display and then returning later, it will not then detect the speakers.

 

A full OSX reboot solves the problem every time. If I boot with the Macbook either connected to or disconnected from the Thunderbolt and then hook everything up it will then happily find and work with the MM-1 without any issues. It seems the act of disconnecting from the Thunderbolt is causing the issue.

 

I've also noticed that video devices (such as the Thunderbolt camera) are also not being detected properly after a disconnect from the Thunderbolt, nor the in-built Thunderbolt audio either - all of which presumably hang off the internal USB bus.


Never seen this behaviour before and it is coincident with the El Capitan upgrade. The fault is very repeatable. A reboot always cures it. Same thing occurs if I use other Thunderbolt displays. Got to be an El Capitan bug surely?

 

Anyone else seeing anything similar, perhaps with other types of audio or multi-media kit?

MacBook Pro, OS X El Capitan (10.11), MM-1

Posted on Oct 5, 2015 9:58 AM

Close

Q: El Capitan intermittent USB multi-media

  • All replies
  • Helpful answers

first Previous Page 3 of 3
  • by lupusyonderboy,

    lupusyonderboy lupusyonderboy Jul 21, 2016 7:15 AM in response to boiing
    Level 1 (4 points)
    Jul 21, 2016 7:15 AM in response to boiing

    Really? Darn, it's still happening to me on 10.11.6:

     

    USB Sound assertion in /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleUSBAudio/AppleUSBAudio-303 .3.1/AppleUSBAudioIsocPipe.cpp at line 106

    USB Sound assertion in /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleUSBAudio/AppleUSBAudio-303 .3.1/AppleUSBAudioIsocPipe.cpp at line 106

    USB Sound assertion in /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleUSBAudio/AppleUSBAudio-303 .3.1/AppleUSBAudioEngine.cpp with return 0xE00002BC at line 2181

    USB Sound assertion in /BuildRoot/Library/Caches/com.apple.xbs/Sources/AppleUSBAudio/AppleUSBAudio-303 .3.1/AppleUSBAudioIsocPipe.cpp at line 152

  • by PommeDeRoute,

    PommeDeRoute PommeDeRoute Aug 8, 2016 5:29 AM in response to bigdave1357
    Level 1 (4 points)
    Aug 8, 2016 5:29 AM in response to bigdave1357

    *********

     

    Problem: I play any multimedia, like a video on Youtube, as soon as I stop and play again, like going to the next video or moving the play location inside the video, it fails to play gain. Reloading the page, changing browser, nothing at the app level will ever play audio.

     

    Environment: My setup is simple: I have various audio systems connected to USB via the built-in Thunderbolt on my monitor on a 15-inch, mid 2015 MacBook Pro. Headphones, speakers... all show the same problem since upgrading to El Capitan.

     

    Workaround: To resume I have to disconnect and reconnect the Thunderbolt cable or turn on-and-off the monitor every time the problem occurs, which is at almost every video. Disconnecting and reconnecting USB or "sudo killall VDCAssistant" does not work.

     

    Observation: I am amazed that Apple doesn't find important to fix this issue. I'm concerned about the lost of focus on technical execution on the Mac: each new OS has few new features, most of them are features that we don't want (like the icloud, siri, facebook integrations), has serious usability issues (full screen, time machine, photos, launchpad, etc), and deep and long lasting bugs like this one (or wake from sleep).

     

    <Edited by Host>

  • by lupusyonderboy,

    lupusyonderboy lupusyonderboy Sep 19, 2016 8:27 AM in response to bigdave1357
    Level 1 (4 points)
    Sep 19, 2016 8:27 AM in response to bigdave1357

    Unsurprisingly, this issue is still happening running the GM release of MacOS Sierra. At this point I'm not hopeful that it's ever going to get fixed.

first Previous Page 3 of 3