I must say that it is only the kernel per se that can be ruled out - but it shouldn't be hard to check the suspected kernel modules either.

As for packages, the method I sketched gave three differences:
Code:
> comm usb-modeswitch-data 20120529-1
> libs libusb-0.1-4 2:0.1.12-23
> libs libusb-1.0-0 2:1.0.11-1
The other package versions were the same:

Code:
< comm usb-modeswitch 1.2.3+repack0-1 
< libs libusbmuxd1 1.0.7-2 
< libs libusbredirparser0 0.4.3-2 
< utils usbmuxd 1.0.7-2 
< utils usbutils 1:005-3 
< x11 xserver-xorg-video-sisusb 1:0.9.4-3
It was only for this I offered help - have no experience with Debian bug reporting...