Hi all, I am battling with a USB GSM/HSDPA modem (Huawei E220). I am currently using Linux 2.6.18.1 with the two patches applied (one prevents the usb-storage driver from detecting the modem as a storage device, and the other adds the product id to option.c).
When I initially boot (or connect) the modem, I get the following messages: Dec 18 12:01:39 carpc kernel: usbcore: registered new driver usbserial Dec 18 12:01:39 carpc kernel: drivers/usb/serial/usb-serial.c: USB Serial support registered for generic Dec 18 12:01:39 carpc kernel: usbserial_generic 1-1:1.0: generic converter detected Dec 18 12:01:39 carpc kernel: usb 1-1: generic converter now attached to ttyUSB0 Dec 18 12:01:39 carpc kernel: usbcore: registered new driver usbserial_generic Dec 18 12:01:39 carpc kernel: drivers/usb/serial/usb-serial.c: USB Serial Driver core Dec 18 12:01:39 carpc kernel: drivers/usb/serial/usb-serial.c: USB Serial support registered for GSM modem (1- port) Dec 18 12:01:39 carpc kernel: usbcore: registered new driver option Dec 18 12:01:39 carpc kernel: drivers/usb/serial/option.c: USB Driver for GSM modems: v0.7.1 On first trying to use the modem, I get the following messages: Dec 18 12:01:40 carpc pppd[2808]: pppd 2.4.3 started by root, uid 0 Dec 18 12:01:41 carpc chat[2819]: abort on (NO CARRIER) Dec 18 12:01:41 carpc chat[2819]: abort on (NO DIALTONE) Dec 18 12:01:41 carpc chat[2819]: abort on (ERROR) Dec 18 12:01:41 carpc chat[2819]: abort on (NO ANSWER) Dec 18 12:01:41 carpc chat[2819]: abort on (BUSY) Dec 18 12:01:41 carpc chat[2819]: send (atz^M) Dec 18 12:01:47 carpc kernel: usb 1-1: USB disconnect, address 3 Dec 18 12:01:47 carpc kernel: usbserial_generic 1-1:1.0: device disconnected Dec 18 12:01:47 carpc chat[2819]: -- write failed: Input/output error Dec 18 12:01:47 carpc chat[2819]: Failed Dec 18 12:01:47 carpc chat[2819]: Can't restore terminal parameters: Input/output error Dec 18 12:01:47 carpc pppd[2808]: Connect script failed Dec 18 12:01:47 carpc kernel: generic ttyUSB0: generic converter now disconnected from ttyUSB0 Dec 18 12:01:58 carpc kernel: usb 1-1: new full speed USB device using uhci_hcd and address 4 Dec 18 12:01:58 carpc kernel: usb 1-1: new device found, idVendor=12d1, idProduct=1003 Dec 18 12:01:58 carpc kernel: usb 1-1: new device strings: Mfr=1, Product=2, SerialNumber=0 Dec 18 12:01:58 carpc kernel: usb 1-1: Product: HUAWEI Mobile Dec 18 12:01:58 carpc kernel: usb 1-1: Manufacturer: HUAWEI Technologies Dec 18 12:01:58 carpc kernel: usb 1-1: configuration #1 chosen from 1 choice Dec 18 12:01:58 carpc kernel: usbserial_generic 1-1:1.0: generic converter detected Dec 18 12:01:58 carpc kernel: usb 1-1: generic converter now attached to ttyUSB0 After the first write, the USB device disconnects. You can also see the LED on the modem flashing in the same sequence it does after an initial connect, so it seems like it is resetting. After the device re-registers, all further writes block, and I get no response from the modem. If I now halt the machine (USB remains powered on standby power), and then restart, I get the following messages and the modem works perfectly: Dec 18 12:14:12 carpc kernel: usbcore: registered new driver usbserial Dec 18 12:14:12 carpc kernel: drivers/usb/serial/usb-serial.c: USB Serial support registered for generic Dec 18 12:14:12 carpc kernel: usbserial_generic 1-1:1.0: generic converter detected Dec 18 12:14:12 carpc kernel: usb 1-1: generic converter now attached to ttyUSB0 Dec 18 12:14:12 carpc kernel: usbserial_generic 1-1:1.1: generic converter detected Dec 18 12:14:12 carpc kernel: usb 1-1: generic converter now attached to ttyUSB1 Dec 18 12:14:12 carpc kernel: usbserial_generic 1-1:1.2: generic converter detected Dec 18 12:14:12 carpc kernel: usb 1-1: generic converter now attached to ttyUSB2 Dec 18 12:14:12 carpc kernel: usbcore: registered new driver usbserial_generic Dec 18 12:14:12 carpc kernel: drivers/usb/serial/usb-serial.c: USB Serial Driver core Dec 18 12:14:12 carpc kernel: drivers/usb/serial/usb-serial.c: USB Serial support registered for GSM modem (1- port) Dec 18 12:14:12 carpc kernel: usbcore: registered new driver option Dec 18 12:14:12 carpc kernel: drivers/usb/serial/option.c: USB Driver for GSM modems: v0.7.1 I have tried this on a number of computers, but the current machine uses the uhci-hcd driver, and the following usb controllers: 00:10.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 80) 00:10.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 80) 00:10.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 Controller (rev 80) 00:10.3 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 82) I have also tested it on dual-boot machines (Windows/Linux). The device always works perfectly under windows, but has the same problems under Linux. Does anybody know what is going wrong here? Some people have reported this problem, and said that they got the modem working reliably using a powered USB hub, which makes it seem like a power problem, but why would the modem work reliably under Windows if it is indeed a power problem? Thanks, Justin ------------------------------------------------------------------------- Take Surveys. Earn Cash. 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