IBM Integrated Bluetooth IV with 56K Modem (BMDC-3)

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IBM Integrated Bluetooth IV with 56K Modem (BMDC-3)

This is a combination USB Bluetooth and AC97 Modem Adapter that is installed in a CDC slot.

Bluetooth Features

  • Chipset: Broadcom
  • USB VID/PID: 0A5C:201E

Modem Features

  • Chipset: Conexant
  • AC'97 Modem

IBM Partnumbers

  • IBM FRU PN: 39T0022 ($37.50 in July 2005) - no longer available at IBM
  • IBM FRU PN: 39T0024 ($49.00 in September 2005) - no longer available at IBM
  • IBM FRU PN: 39T0026 ($46.00 in October 2005)

This part takes the place of the 56K Modem board. It requires a Bluetooth antenna, and some ThinkPads built without Bluetooth already have the antenna installed -- the antenna wire may be found disconnected and taped under the Modem board.

In addition to the Modem/BT module, a Bluetooth Thinkpad also uses an extra indicator LED below the LCD display, and another indicator LED on the top of the lid. To see these two LEDs, two new clear plates are required. The entire set of replacement sticker plates can be ordered as FRU 26R8409 ($12 as of July 2005). (formerly FRU: 13R2455)

Linux Bluetooth driver

The Bluetooth device is implemented using USB. Enabling/disabling bluetooth leads to USB connect and disconnect events. It can be enabled or disabled by:

  • pressing the FnF5 key combination;
  • using ibm-acpi.

The bcm203x kernel module, which is included in recent kernels, supports this chipset. Since the Bluetooth device is using USB, you have to make sure to compile it as a module. If it's built into the kernel, the kernel won't detect the chip at boottime (when Bluetooth is turned off).

Use bluez-utils ( or fancier software like the GNOME Bluetooth subsystem ( to use the device.

Some problems have been reported using bluetooth after a suspend/resume cycle on the T43. These problems can be mitigated by unloading the USB kernel modules (uhci_hcd, ehci_hcd, hci_usb, bcm203x) before the machine is put to sleep, and by re-loading these modules when the machine wakes up again.

On a T43p you must ensure that you call hotplug (re)start upon resume or you will lose bluetooth functionality. See the ACPI area for sample suspend scripts, or if bluetooth flakes on a debian system at any time you can manually call

/etc/init.d/hotplug restart

and then it will come back with another FnF5 press.

Linux Modem driver

Although, the Smartlink driver for Agere modems is able to communicate with the modem via AT commands, it cannot dial out (contradicting reports welcome!).

If your favourite distribution does not include a hsfmodem driver (search for "hsfmodem" or "Conexant"), you can try the one from Linuxant: (14k free as in beer, 56k+Fax license 15$, they explain this policy under: )

ThinkPads this card may be found in

External Sources