Sometimes, I don't get access to the Display Audio that my Thunderbolt Apple Display provides when I dock to the machine with my MacBook Pro. The clunky way to solve this, is a reboot. I've tried using the Apple Preferences (Sound), but that fails to provide the option, unless I reboot. Here is what my system_profiler shows as available Sound/Devices after the reboot (and when the Apple Preferences does give me the option to select the bigger Thunderbolt display):
Devices: Built-in Input: Input Channels: 2 Manufacturer: Apple Inc. Current SampleRate: 44100 Transport: Built-in Built-in Output: Default System Output Device: Yes Manufacturer: Apple Inc. Output Channels: 2 Current SampleRate: 44100 Transport: Built-in Display Audio: Default Input Device: Yes Default Output Device: Yes Input Channels: 1 Manufacturer: Apple Inc. Output Channels: 2 Current SampleRate: 44100 Transport: USB
Any ideas how to 'wake-up' the Thunderbolt connection to recognize the third item (Display Audio) without resorting to a reboot? Ideally, that would at least activate it as an option in the Apple Preferences menu.
Here's a picture of the Preferences: