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 ($78.50 in March 2006, was $50.00 in January 2006)

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.

To check if your T4x laptop has a BlueTooth antenna, check the parts list for the specific model. More directly, you can check whether there is a white antenna wire (in addition to the two WiFi antenna cables, which are gray and black) passing through the left LCD hinge: either peek through the small hole in front of the left hinge, or remove the keyboard and inspect the wires near the CDC (see here or here).

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 ($14.00 as of January 2006). (formerly FRU: 13R2455)

As of January 2006, IBM charged $13.50 for airborne shipping.


Linux Bluetooth driver

The Bluetooth device is implemented using USB. Enabling/disabling bluetooth (i.e. by use of FnF5) leads to USB connect and disconnect events.

As Bluetooth is implemented using USB, this will only work with USB drivers enabled:

# modprobe uhci-hcd ; modprobe ehci-hcd

The bcm203x kernel module, which is included in recent kernels, supports this chipset. You have to make sure to compile it as a module since 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 it will come back with another FnF5 press.

Linux modem driver

See Conexant HSF modem drivers.

ThinkPads this card may be found in

See also

External Sources