Bluetooth Daughter Card (BDC)

This is a USB Bluetooth Adapter that is installed in a CDC slot.

Features

Chipset: TDK BDC01 Bluetooth 1.1 Controller
Speeds: 434/723 Kbps
USB ID: 04BF:0310
Headers: One 3-pin connector¹, one Hirose U.FL connector

FOOTNOTES [Δ]

This was likely used for debug purposes. For safety reasons, do not connect this to any available pin-compatible connector on your ThinkPad.

IBM Partnumbers

IBM FRU PN: 12P3872, 26P8041, 26P8071

Also known (in IBM literature) as....

Bluetooth Daughter Card
Bluetooth Daughter Card board
BDC board

Firmware

A firmware update is available for this adapter from IBM.
The updated firmware is version 310, and is available here

This firmware update can unfortunately only be applied from Windows.
In theory an update for Linux exists; the BTDFU update utility that can be found on the pages of Marcel Holtmann, the current Linux BlueZ stack maintainer, which can be found here. You need to get the original IBM update file and extract the file with the extension "dfu" from it using cabextract. Using the btdfu tool and this file it should be possible to update the firmware. This procedure has not yet been confirmed.

Linux driver

This card will work with the standard Linux Bluetooth drivers.

This device is implemented as a USB device, you might be able to enable or disable it by using Fn-F5.

External Sources

IBM's page about configuring Bluetooth under Linux

This card may be found in

Bluetooth Daughter Card (BDC)