usb 2-1: new full speed USB device using uhci_hcd and address 3
[ 531.205000] usb 2-1: configuration #1 chosen from 1 choice
[ 531.317000] cdc_acm 2-1:1.0: ttyACM0: USB ACM device
[ 531.320000] usbcore: registered new interface driver cdc_acm
[ 531.320000] drivers/usb/class/cdc-acm.c: v0.25:USB Abstract Control Model driver for USB modems and ISDN adapters
[ 1091.603000] usb 2-1: USB disconnect, address 3
[ 1107.058000] usb 2-1: new full speed USB device using uhci_hcd and address 4
[ 1107.205000] usb 2-1: configuration #1 chosen from 1 choice
[ 1107.208000] cdc_acm 2-1:1.0: ttyACM0: USB ACM device