Symptoms
Edge Gateway 300x with Ubuntu Core 16 – The system serial ports (232/422/485) cannot transfer data or show garbled data when the system wakes from S3/S4.
Serial Ports cannot transfer data.
While deploying the Edge Gateway 300x with Ubuntu Core 16 you will notice that after waking the system from a S3/S4 sleep state, data transfer over the system’s serial ports (232/422/485) will not be able to transfer data or will show garbled data.
Solution.
Canonical has provided an update the kernel that addresses this issue.
Connect the unit to the Internet and allow automatic Over-the-Air (OTA) updates from the Ubuntu Snap Store.
This will update the Kernel to version 37 which resolves this issue.
Resolution
refer to the symptoms above
