In the meantime i have tried to narrow the bug down further:
* I have replaced the raspberry pi
* Ensured that i use grounded power supplied for the hubs
* Tested with raspi-os & old "known good" kernel 4.19 (from https://github.com/raspberrypi/linux/issues/3981)
I experienced the problem with all of these. The error messages differ but the end result of all USB devices disconnecting was the same (btw this includes a USB stick that is NOT connected to a hub).
So i think this is not an ubuntu specific problem.
This problem does not occur if i use the USB2 ports.
How did you do that @juergh? Similar setup?
In the meantime i have tried to narrow the bug down further:
* I have replaced the raspberry pi /github. com/raspberrypi /linux/ issues/ 3981)
* Ensured that i use grounded power supplied for the hubs
* Tested with raspi-os & old "known good" kernel 4.19 (from https:/
I experienced the problem with all of these. The error messages differ but the end result of all USB devices disconnecting was the same (btw this includes a USB stick that is NOT connected to a hub).
So i think this is not an ubuntu specific problem.
This problem does not occur if i use the USB2 ports.