There are two usecases for my MacBookPro15,1: When I am on the road I just use it as it is without any peripheral devices. But when I am at home, I put it (with closed lid) in the book arc and connect it to my thunderbolt3-dock (Kensington SD5000T). The dock is connected to ethernet, two displays (via TB3-to-2x-DP Adapter) and my USB-Audio-Interface (RME Fireface UC). Additionally I use a Bluetooth Kebyboard and a BT-Trackpad.
Everything works fine except the audio interface. That only works after reconnect.
I suspect some security feature of the OS that ignores all formerly unconnected USB-Devices before login. But I am not sure about this.
Its getting on my nerves to reconnect the audio interface every single time. So I want my macbook to recognize this device automatically. Maybe its possible to rescan USB after login or mark this audio interface as trusted device somehow?
As jksoegaard suggested, I tested whether the USB recognition problem is related to the TB3-Dock. It is not. Here is how to reproduce:
- Have the open MacBook on the desk with nothing connected.
- Make sure its locked
- Plug in a USB device, for example a microSD Cardreader with card in it.
- Wake up and unlock the macbook (password, TouchID, Applewatch,...)
- Notice: The plugged-in USB-Device is not recognized at all (not even unmounted as onik suggested in his comment)
- Disconnect and reconnect the USB-Device
- Notice: Device is recognized correctly
As I remember correctly, I already know this behavior from my old MBP (early 2013), since I bought it back then.
For the sake of completeness, I also tested this behavior with my MBP from work (Generation 2018, 13" Touchbar). It is exactly the same there.
jksoegaard pointed out that my last update was confusing because I used a USB cardreader for testing instead of the audio interface. For clarification: the cardreader was meant to be a generic usb device (which is not the audio interface) for testing. But as it seems, storage devices are something different.
As I tried out to connect the interface to the macbook directly, the problem got weird. There seem to be two cases.
- switch audio interface off
- connect to macbook (does not matter if locked or not)
- switch on audio interface
- audio interface is recognized correctly
- Audio interface is switched on and was last used in via the TB3-Dock connect audio-interface directly to macbook (does not matter if locked or not)
- audio interface is not recognized
- Disconnect and reconnect audio interface (does not matter what port or how often I try)
- audio interface is still not recognized
That makes the audio interface look like the root cause of the problem. But I do not understand why it behaves completely different on the TB3-Dock. If connected via the dock, there is no interface power cycle needed, because reconnecting works at the latest.
This leaves me a little puzzled, as i do not know how to pin down the problem further. Any advice?