On Sat, Jun 16, 2007 at 01:41:44AM +0100, Mikhail Ramendik wrote: > 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
How is the generic driver binding to this device "automatically"? Do you have a modprobe config file adding your device id to that driver? If so, try removing it and using a newer kernel that should support this device automatically and properly. thanks, greg k-h ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
