Serial can't find my devices

[b135802]

Could you send the output of the command lsusb when the devices are detected and again when they are not?

With the usb-gps connected to the usb-hub:

Code:

lsusb
Bus 002 Device 005: ID 2109:0817 VIA Labs, Inc. USB3.0 Hub             
Bus 002 Device 004: ID 2109:0817 VIA Labs, Inc. USB3.0 Hub             
Bus 002 Device 003: ID 2109:0817 VIA Labs, Inc. USB3.0 Hub             
Bus 002 Device 002: ID 0781:5583 SanDisk Corp. Ultra Fit
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

With the usb-gps connected to the RPi directly:

Code:

lsusb
Bus 002 Device 005: ID 2109:0817 VIA Labs, Inc. USB3.0 Hub             
Bus 002 Device 004: ID 2109:0817 VIA Labs, Inc. USB3.0 Hub             
Bus 002 Device 003: ID 2109:0817 VIA Labs, Inc. USB3.0 Hub             
Bus 002 Device 002: ID 0781:5583 SanDisk Corp. Ultra Fit
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub

No difference that I can see.