Arch Linux

carbolymer

Member

Registered: 2012-04-25

Posts: 42

Long time connecting to the USB modem

Hello.

I have nokia 6220 classic and I'm using it as a 3G modem. Everything works fine, but when I'm connecting it it takes about 60 (!) seconds to detect modem by NetworkManager and be able to estabilish connection. A little bit of research showed that the main problem is that two times during modem recognition procedure serial port is being closed, which takes 30 seconds each:

Apr 28 17:35:07 nucleon kernel: [ 1266.639944] usb 2-1: new high-speed USB device number 8 using ehci_hcd
Apr 28 17:35:08 nucleon kernel: [ 1266.765731] cdc_acm 2-1:1.0: ttyACM0: USB ACM device
Apr 28 17:35:08 nucleon kernel: [ 1266.770234] usb 2-1: bad CDC descriptors
Apr 28 17:35:08 nucleon kernel: [ 1266.770366] cdc_acm 2-1:1.2: ttyACM1: USB ACM device
Apr 28 17:35:08 nucleon mtp-probe: checking bus 2, device 8: "/sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1"
Apr 28 17:35:08 nucleon mtp-probe: bus: 2, device: 8 was not an MTP device
Apr 28 17:35:08 nucleon modem-manager[4122]: <info>  (ttyACM0) opening serial port...
Apr 28 17:35:08 nucleon modem-manager[4122]: <info>  (ttyACM1) opening serial port...
Apr 28 17:35:09 nucleon modem-manager[4122]: <info>  (ttyACM0) closing serial port...
Apr 28 17:35:09 nucleon modem-manager[4122]: <info>  (ttyACM0) serial port closed
Apr 28 17:35:09 nucleon modem-manager[4122]: <info>  (ttyACM0) opening serial port...
Apr 28 17:35:09 nucleon modem-manager[4122]: <info>  (Nokia): GSM modem /sys/devices/pci0000:00/0000:00:1d.7/usb2/2-1 claimed port ttyACM0
Apr 28 17:35:09 nucleon modem-manager[4122]: <info>  (ttyACM0) closing serial port...
Apr 28 17:35:09 nucleon modem-manager[4122]: <info>  (ttyACM0) serial port closed
Apr 28 17:35:43 nucleon modem-manager[4122]: <info>  (ttyACM1) closing serial port...
Apr 28 17:36:13 nucleon modem-manager[4122]: <info>  (ttyACM1) serial port closed
Apr 28 17:36:13 nucleon NetworkManager[4791]: <warn> (ttyACM0): failed to look up interface index
Apr 28 17:36:13 nucleon NetworkManager[4791]: <info> (ttyACM0): new GSM/UMTS device (driver: 'cdc_acm' ifindex: 0)
Apr 28 17:36:13 nucleon NetworkManager[4791]: <info> (ttyACM0): exported as /org/freedesktop/NetworkManager/Devices/3
Apr 28 17:36:13 nucleon NetworkManager[4791]: <info> (ttyACM0): now managed
Apr 28 17:36:13 nucleon NetworkManager[4791]: <info> (ttyACM0): device state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
Apr 28 17:36:13 nucleon NetworkManager[4791]: <info> (ttyACM0): deactivating device (reason 'managed') [2]
Apr 28 17:36:13 nucleon NetworkManager[4791]: <info> (ttyACM0): device state change: unavailable -> disconnected (reason 'none') [20 30 0]

I've found also this:
http://permalink.gmane.org/gmane.linux.kernel/1056812

How can I improve speed of modem detection?