I use Gammu/Wammu to connect to my mobile phone (Sony Ericsson W660i) With kernel 3.2 (debian wheezy) it works fine. But with kernel 3.16 (debian jessie) or even 4.0.2 it doesn't work. Moreover, the connection of the phone to the PC makes some configuration changes on my phone. It changes my netwok connection type from "2G only" to "2G/3G" for obscure reasons BTW, it seems the connection gets lost when the phone backlight turns off Here is the dmesg when I connect the phone [ 1536.912061] usb 3-2: new full-speed USB device number 2 using uhci_hcd [ 1537.168027] usb 3-2: New USB device found, idVendor=0fce, idProduct=d0a3 [ 1537.168035] usb 3-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [ 1537.168040] usb 3-2: Product: Sony Ericsson W660 [ 1537.168044] usb 3-2: Manufacturer: Sony Ericsson [ 1537.168048] usb 3-2: SerialNumber: 3571550133112050 [ 1537.371402] cdc_ether 3-2:3.8 usb0: register 'cdc_ether' at usb-0000:00:1d.1-2, CDC Ethernet Device, 02:80:37:fa:02:00 [ 1537.371459] usbcore: registered new interface driver cdc_ether [ 1537.380242] cdc_wdm 3-2:3.7: cdc-wdm0: USB WDM device [ 1537.380282] usbcore: registered new interface driver cdc_wdm [ 1537.382752] cdc_acm 3-2:3.1: ttyACM0: USB ACM device [ 1537.387047] cdc_acm 3-2:3.3: ttyACM1: USB ACM device [ 1537.389890] usbcore: registered new interface driver cdc_acm [ 1537.389894] cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters [ 1537.424010] cdc_wdm 3-2:3.7: wdm_int_callback - 0 bytes [ 1537.446697] cdc_ether 3-2:3.8 usb0: kevent 12 may have been dropped
On Thu, Jun 18, 2015 at 07:08:49AM +0000, bugzilla-daemon@bugzilla.kernel.org wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=100091 > > Bug ID: 100091 > Summary: cdc_acm / cdc_wdm issue. Connection to device lost > (Sony Ericsson w660) Please send to the linux-usb@vger.kernel.org mailing list.
Oh ! I just realized my mistake. Actually it is not the kernel that is faulty but my configuration (since I migrated from debian wheezy to jessie). I had connection/disconnection issues because of conflicts between gammu and ModemManager. It is also ModemManager which took the control of my phone and switched to 3G network. Now that I disabled NetworkManager for my phone, I don't have such issues any more with kernel 3.16 or 4.0 (backlight still extincts, but that's by design for my phone) Sorry for that. Kind regards Fab