USB reconnect problem

USB reconnect problem

[Thomas Gufler]

Hi,

I use a Huawei E220 UMTS/HSDPA modem for my internet connection. When I 
connect the modem before booting everything works fine. I get a 
/dev/ttyUSB0, /dev/ttyUSB1 and /dev/ttyUSB2 device. But when I remove 
the device and reconnect it later (without rebooting) only /dev/ttyUSB0 
is created and the modem no longer works (at least until the next reboot).


/var/log/message looks like this when the modem is detected during the 
initial boot:

usbcore: registered new interface driver usbserial_generic
 drivers/usb/serial/usb-serial.c: USB Serial Driver core
 drivers/usb/serial/usb-serial.c: USB Serial support registered for GSM 
modem (1-port)
 option 3-2:1.0: GSM modem (1-port) converter detected
 usb 3-2: GSM modem (1-port) converter now attached to ttyUSB0
 option 3-2:1.1: GSM modem (1-port) converter detected
 usb 3-2: GSM modem (1-port) converter now attached to ttyUSB1
 option 3-2:1.2: GSM modem (1-port) converter detected
 usb 3-2: GSM modem (1-port) converter now attached to ttyUSB2
 usbcore: registered new interface driver option
 drivers/usb/serial/option.c: USB Driver for GSM modems: v0.7.1
 usbcore: registered new interface driver libusual

removing:

usb 3-2: USB disconnect, address 2
 option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
 option 3-2:1.0: device disconnected
 option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
 option 3-2:1.1: device disconnected
 option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
 option 3-2:1.2: device disconnected

and reconnect:

usb 3-2: new full speed USB device using uhci_hcd and address 3
 usb 3-2: configuration #1 chosen from 1 choice
 option 3-2:1.0: GSM modem (1-port) converter detected
 usb 3-2: GSM modem (1-port) converter now attached to ttyUSB0

This is logs are from a Ubuntu Feisty System (kernel 2.6.20, udev-108)

Any suggestions?

Thomas

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