this does not look good. 
[  983.014897] usb 2-2: new high-speed USB device number 79 using xhci_hcd
[  988.719212] usb 2-2: new high-speed USB device number 81 using xhci_hcd
[  994.047456] usb 2-2: new high-speed USB device number 82 using xhci_hcd
[  999.343739] usb 2-2: new high-speed USB device number 83 using xhci_hcd
[ 1005.088013] usb 2-2: new high-speed USB device number 86 using xhci_hcd
[ 1010.384266] usb 2-2: new high-speed USB device number 87 using xhci_hcd
[ 1015.684524] usb 2-2: new high-speed USB device number 88 using xhci_hcd
[ 1020.980840] usb 2-2: new high-speed USB device number 89 using xhci_hcd
[ 1021.110713] usb 2-2: New USB device found, idVendor=04e8, idProduct=6860
[ 1021.110716] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 1021.110718] usb 2-2: Product: SAMSUNG_Android
[ 1021.110719] usb 2-2: Manufacturer: SAMSUNG
[ 1021.110720] usb 2-2: SerialNumber: 290fc46c
[ 1021.644871] cdc_acm 2-2:1.1: ttyACM0: USB ACM device
[ 1021.645785] usbcore: registered new interface driver cdc_acm
[ 1021.645788] cdc_acm: USB Abstract Control Model driver for USB modems and 
ISDN adapters
[ 1024.306555] usb 2-2: USB disconnect, device number 89
[ 1024.306806] cdc_acm 2-2:1.1: failed to set dtr/rts
[ 1024.580980] usb 2-2: new high-speed USB device number 90 using xhci_hcd
[ 1024.710038] usb 2-2: New USB device found, idVendor=04e8, idProduct=6860
[ 1024.710041] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 1024.710043] usb 2-2: Product: SAMSUNG_Android
[ 1024.710044] usb 2-2: Manufacturer: SAMSUNG
[ 1024.710045] usb 2-2: SerialNumber: 290fc46c
[ 1024.711491] cdc_acm 2-2:1.1: ttyACM0: USB ACM device
[ 1025.133224] usb 2-2: USB disconnect, device number 90
[ 1025.621029] usb 2-2: new high-speed USB device number 92 using xhci_hcd
[ 1025.949086] usb 2-2: new high-speed USB device number 93 using xhci_hcd
[ 1031.245312] usb 2-2: new high-speed USB device number 94 using xhci_hcd
[ 1031.374588] usb 2-2: New USB device found, idVendor=04e8, idProduct=6860
[ 1031.374591] usb 2-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 1031.374592] usb 2-2: Product: SAMSUNG_Android
[ 1031.374593] usb 2-2: Manufacturer: SAMSUNG
[ 1031.374594] usb 2-2: SerialNumber: 290fc46c
[ 1031.375471] cdc_acm 2-2:1.1: ttyACM0: USB ACM device
[ 1245.592672] usb 2-2: USB disconnect, device number 94
[ 1245.866958] usb 2-2: new high-speed USB device number 95 using xhci_hcd
[ 1251.163122] usb 2-2: new high-speed USB device number 96 using xhci_hcd
[ 1256.459429] usb 2-2: new high-speed USB device number 97 using xhci_hcd


can it be auto suspend on the USB port?

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https://bugs.launchpad.net/bugs/1072278

Title:
  lsusb hangs forever

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