I've been running the Beta for El Capitan for a while now, but since the OS got officially released today, I feel it's okay to ask a question.
FYI: I'm running the GM.
I have an iMac with a Bose Companion 5 connected through USB. It's recognised perfectly fine, but once in a while, it just seems to stop sending audio over USB and just starts playing on the internal speakers.
This never really happens in the middle of a song or video, it seems to happen between songs/videos, when the iMac doesn't output sound for a while. This can sometimes mean that one Youtube-video plays over the USB-speakers, while the next, which gets started 2 seconds after the previous one, plays over the internal speakers.
OSX still recognises the speakers (shows them in
system settings under
sound) when it stops sending audio, but it simply won't play. When it suddenly starts playing on the internal speakers, changing volume doesn't work, because the USB-speakers are still selected in system settings. I have to change to
Internal Speakers before I can change the volume. If I then wait a little bit and change back to
Bose USB Audio, the external speakers work without trouble, until it decides to do the above all over again.
Anyone has a fix for this problem? I have of course reported it to Apple while testing the beta, but I guess they haven't picked it up.