Here's the details for the Sony Ericsson W705.
Potential MTP Device with VendorID:0fce and ProductID:0105 responded to control message 2 with a response that was too short. Problems may arrise but continuing
Device 0 (VID=0fce and PID=0105) is UNKNOWN.
Please report this VID/PID and the device model to the libmtp development team
PTP: Opening session
Potential MTP Device with...
2009-08-03 16:17:14 UTC in libmtp