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Same issue with my MBA 2020 vs. the mouse (KB is wireless) for almost two months, swapped the noname USB-C hub for a "proper" Anker, still the same. What I discovered is, apart from rebooting, if I connect the hub's USB3 to another USB3 hub (posh Dell monitor) and connect the mouse there, it works. I think it's not about hardware as a reboot fixes the issue for me too.
Good to hear somebody dealing with this through the proper channels. I pinged my friend in Cupertino and he promised he'll take a look at the internal bug reports etc., but our communication is one-way most of the time as he can't let stuff slip.
disq
Velocio
I received my MBP 2020! Yay!
It's faulty! Wait wut?
Yeah, my first ever Mac... and the fault goes like this...
I have a USB 2 keyboard (Filco) and a USB 2 mouse (Razer) and a USB 3 camera (Elgato)... so I need an external hub... this is OK, I have 3 hubs at my disposal:
Great... I have hubs.
So I plug all the things in the Satechi, connect it... and after a while the keyboard and mouse stop working. They worked for a while (not obviously hardware issue) and then they stop working. Yet... the camera still works and it's connected to the same device!? Strange.
I try StarTech hub... same thing happens. After a while, 5 minutes... 2 hours... whatever... the keyboard and mouse stop working. But the camera still works! That too is all in the same hub... so the hub is fine, and it's now a different hub, so the common delimiter is the MacBook Pro 2020.
I do all of this again without the mouse... same shit.
I do all of this again without the keyboard... same shit.
I do all of this again without the camera... same shit.
Each time, a reboot will bring the USB devices back for sure, but sometimes that do magically start working, but this is not common.
So now I go online and I learn about SMC reset...
Same shit.
Then I contact Apple, and they have me do:
Exhausted... another 2 calls later and I've made a discovery!
If I put the keyboard in one USB C hub, and the mouse in another USB C hub and the camera in the other USB C hub... then the keyboard and mouse still fail at the same time, and the camera keeps working.
Additionally, in System Information under USB devices, I can disconnect the camera and refresh and the camera is gone, I can plug it in to another device and it's there again... so USB 3.1 works via any hub all the time.
But... when either the keyboard or mouse fail, which are both USB 2.0 devices... then System Information shows them as being connected even if I disconnect them. Even if I move them to another hub they still show as being connected to the original hub.
Weirder still is that this discovery led to something else... it's only the USB 2.0 devices... these fail regardless of whether they utilise the same or different USB C hubs and thunderbolt ports.
At this time they've escalated to an engineer with all this information.
My hypothesis though: The MacBook Pro has a USB 2.0 controller for all devices connected to the system bus regardless of which thunderbolt / usb-c connection it is connected to. And something is wrong with that.
I appear to have a motherboard failure on a brand new MBP 2020. And boy is that frustrating for my first personally owned Apple laptop ever.
I await the engineer, which is probably next week.