cdc_acm / cdc_wdm issue. Connection to device lost (Sony Ericsson w660)

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Hello,

I'm facing some issues to connect to my mobile phone (Sony Ericsson W660i)

I use Gammu/Wammu to connect to my mobile phone
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

I already reported the following bug
https://bugzilla.kernel.org/show_bug.cgi?id=100091

Is there anything to do ? Fix ?

Kind regards

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