In general USB ports are working fine on our system based on iMX6 CPU Board. However, from time to time it can happen that the USB device ports (Type-A) don’t react and don’t provide power anymore (LED on external USB hub stays dark). In case of the error the USB host port (Type-B) is still functional.
The USB bus is trimmed to FullSpeed via registry since our hardware is not HighSpeed compliant
We also recorded the USB traffic with a USB Bus Analyzer when connecting a USB stick in case of error and no error (see attached images). We have the feeling that the problem mostly occurs right after connecting or disconnecting USB devices.
Do you have an idea what might cause the problem?
Successful USB Connect:
Failing USB Connect: