@macberg I have two cheap #HDMI monitors connected via a #calDigit over #thunderbolt to an Intel laptop. Until 6.3 there was no sound if I login when everything is connected. The speaker icon is crossed out and there are no available sound devices in the settings. But if I login with the thunderbolt disconnected and plug it in later the sound worked perfectly on both the internal speakers or through the headphones jack.
Now it's working regardless of what devices are plugged in when I login.