acer mark # dmesg
usb 3-3: new full speed USB device using ohci_hcd and address 3
usb 3-3: device descriptor read/64, error -110
usb 3-3: device descriptor read/64, error -110
usb 3-3: new full speed USB device using ohci_hcd and address 4
cdc_acm 3-3:1.0: ttyACM0: USB ACM device
usbcore: registered new driver cdc_acm
drivers/usb/class/cdc-acm.c: v0.23:USB Abstract Control Model driver for USB modems and ISDN adapters