There seems to be different kinds of CS-15 modems out there. For two of my devices lsusb -v gives
"wMaxPacketSize 0x0040 1x 64 bytes" for a modem with bigger IMEI
and
"wMaxPacketSize 0x0200 1x 512 bytes" for a modem with smaller IMEI.
The differences in behaviour with some current kernels can be found in reported bug #496256 in comment #60.
There seems to be different kinds of CS-15 modems out there. For two of my devices lsusb -v gives
"wMaxPacketSize 0x0040 1x 64 bytes" for a modem with bigger IMEI
and
"wMaxPacketSize 0x0200 1x 512 bytes" for a modem with smaller IMEI.
The differences in behaviour with some current kernels can be found in reported bug #496256 in comment #60.