Thunderbolt Display's audio 'cracking, hissing' noises after El Capitan upgrade

Solution 1:

I have the same issue since El Capitan upgrade (2012 MBA). No other TB devices connected apart from the display. A restart seems to help, for a short time, as does switching the audio output from the display to the internal speakers and back again.

Removing all USB peripherals plugged into the display seems to prevent it happening, but is not exactly a "solution". Other devices are just a Apple USB keyboard, Logitech wired mouse, and a powered USB3 external HDD.

I thought it might be a grounding problem (no idea why the OS upgrade would affect this), but no amount of grounding the aluminum keyboard to the computer casing, or the display casing etc. seems to make a difference.

I am not aware of any core audio plugins installed - any way to find this out?

Solution 2:

I have kind of a similar problem. I own a Macbook Pro 13" Mid 2014, and a LGUM95 monitor, this two devices are connected with Thunderbolt. The i have my B&W MM-1 Speakers connected to my monitor with USB. After upgrading to El Capitan, i have a annoying problem. When i start my Mac all works fine, but after some time, my sound suddenly disappear, and if i for example try to start a video on YouTube it won't start. Then i can disconnect my speakers and connect them agin and it then works for some time, until the same starts over again.