Hello,
I am using a Huawei E220 3G/HSDPA modem. As advised here, to raise the speed I
upgraded the kernel to 2.6.21.
Now the modem works faster, and also it is detected automatically - in 2.6.18
I had to use modprobe. However, I still have a problem. The modem only works
100% if it's connected when the machine boots up and stays connected.
Unfortunately, sometimes when I boot up the modem is put into a strange state
where the signal indicator does not flash, and while the modem responds a
connection is never established. I am not sure if the kernel or the BIOS is
at fault here - how do I check?
This state is resolved by reconnecting the modem - but the driver dos not
always work when reconnecting! The device /dev/ttyUSB0 is visible but does
note respond. And if the modem was not connected on boot-up, attaching it
later never works, the device does not become available.
I have looked into /var/log/messages . On bootup the relevant content is:
Jun 16 01:07:19 localhost kernel: usbcore: registered new interface driver
usbserial
Jun 16 01:07:19 localhost kernel: drivers/usb/serial/usb-serial.c: USB Serial
support registered for generic
Jun 16 01:07:19 localhost kernel: usbserial_generic 1-1:1.0: generic converter
detected
Jun 16 01:07:19 localhost kernel: usb 1-1: generic converter now attached to
ttyUSB0
Jun 16 01:07:19 localhost kernel: usbserial_generic 1-1:1.1: generic converter
detected
Jun 16 01:07:19 localhost kernel: usb 1-1: generic converter now attached to
ttyUSB1
Jun 16 01:07:19 localhost kernel: usbserial_generic 1-1:1.2: generic converter
detected
Jun 16 01:07:19 localhost kernel: usb 1-1: generic converter now attached to
ttyUSB2
Jun 16 01:07:19 localhost kernel: usbcore: registered new interface driver
usbserial_generic
Jun 16 01:07:19 localhost kernel: drivers/usb/serial/usb-serial.c: USB Serial
Driver core
Jun 16 01:07:19 localhost kernel: drivers/usb/serial/usb-serial.c: USB Serial
support registered for GSM modem (1-port)
Jun 16 01:07:19 localhost kernel: usbcore: registered new interface driver
option
Jun 16 01:07:19 localhost kernel: drivers/usb/serial/option.c: USB Driver for
GSM modems: v0.7.1
On a reconnect after which the modem DOES work, the content is:
Jun 16 01:23:58 localhost kernel: usb 3-1: USB disconnect, address 2
Jun 16 01:23:58 localhost kernel: generic ttyUSB0: generic converter now
disconnected from ttyUSB0
Jun 16 01:23:58 localhost kernel: usbserial_generic 3-1:1.0: device
disconnected
Jun 16 01:23:58 localhost kernel: generic ttyUSB1: generic converter now
disconnected from ttyUSB1
Jun 16 01:23:58 localhost kernel: usbserial_generic 3-1:1.1: device
disconnected
Jun 16 01:23:58 localhost kernel: generic ttyUSB2: generic converter now
disconnected from ttyUSB2
Jun 16 01:23:58 localhost kernel: usbserial_generic 3-1:1.2: device
disconnected
Jun 16 01:24:18 localhost kernel: usb 3-1: new full speed USB device using
ohci_hcd and address 3
Jun 16 01:24:18 localhost kernel: usb 3-1: configuration #1 chosen from 1
choice
Jun 16 01:24:18 localhost kernel: usb-storage: device ignored
Jun 16 01:24:18 localhost kernel: usbserial_generic 3-1:1.0: GSM modem
(1-port) converter detected
Jun 16 01:24:18 localhost kernel: usb 3-1: GSM modem (1-port) converter now
attached to ttyUSB0
Jun 16 01:24:18 localhost kernel: usb-storage: device ignored
Jun 16 01:24:18 localhost kernel: usbserial_generic 3-1:1.1: GSM modem
(1-port) converter detected
Jun 16 01:24:18 localhost kernel: usb 3-1: GSM modem (1-port) converter now
attached to ttyUSB1
Jun 16 01:24:18 localhost kernel: usb-storage: device ignored
Jun 16 01:24:18 localhost kernel: usbserial_generic 3-1:1.2: GSM modem
(1-port) converter detected
Jun 16 01:24:18 localhost kernel: usb 3-1: GSM modem (1-port) converter now
attached to ttyUSB2
On a reconnect after which the modem DOES NOT work (the device is available
but does not respont), the content is:
Jun 16 01:11:05 localhost kernel: usb 1-1: USB disconnect, address 3
Jun 16 01:11:05 localhost kernel: generic ttyUSB0: generic converter now
disconnected from ttyUSB0
Jun 16 01:11:05 localhost kernel: usbserial_generic 1-1:1.0: device
disconnected
Jun 16 01:11:05 localhost kernel: generic ttyUSB1: generic converter now
disconnected from ttyUSB1
Jun 16 01:11:05 localhost kernel: usbserial_generic 1-1:1.1: device
disconnected
Jun 16 01:11:05 localhost kernel: generic ttyUSB2: generic converter now
disconnected from ttyUSB2
Jun 16 01:11:05 localhost kernel: usbserial_generic 1-1:1.2: device
disconnected
Jun 16 01:11:30 localhost kernel: usb 1-1: new full speed USB device using
ohci_hcd and address 5
Jun 16 01:11:30 localhost kernel: usb 1-1: configuration #1 chosen from 1
choice
Jun 16 01:11:30 localhost kernel: usb-storage: device ignored
Jun 16 01:11:30 localhost kernel: usbserial_generic 1-1:1.0: GSM modem
(1-port) converter detected
Jun 16 01:11:30 localhost kernel: usb 1-1: GSM modem (1-port) converter now
attached to ttyUSB0
(Note the absence of ttyUSB1 and ttyUSB2)
If the modem was not connected at boot-up and I try to connect it later,
nothing is added to /var/log/messages.
My questions are:
- If this is a result of some misconfiguration, what should I change?
- If this may be a bug, how can I help investigate?
- Also, how do I find out of the strange modem state that sometimes happens on
bootup is actually the result of a Linux problem? I have the log for one case
like this, and messages from another driver (saa7130, for my tv tuner) have
got into /var/log/messages between loading of usbserial and attaching
of /dev/ttyUSBn devices; can this be relevant?
--
Yours, Mikhail Ramendik
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