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It currently matches the vendor-wide Realtek quirk and is therefore initialized through btrtl. The controller does not respond to the Realtek-specific register access and initialization fails with: Bluetooth: hci0: RTL: RTL: Read reg16 failed (-110) No Bluetooth controller is then available to userspace. Add an exact match for 0bda:0002 before the generic Realtek entry so that the device is handled as a generic USB HCI controller. With this change the controller registers successfully. Scanning, pairing and A2DP audio have been tested successfully. Fixes: a2698a9bf9b0 ("Bluetooth: btusb: Add Realtek 8723A/8723B/8761A/8821A support") Cc: stable@vger.kernel.org Assisted-by: ChatGPT:GPT-5.6-Sol Signed-off-by: Andrew Bille --- drivers/bluetooth/btusb.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index 184e95c1625e..fb9fdf90a3b9 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -615,6 +615,9 @@ static const struct usb_device_id quirks_table[] = { { USB_DEVICE(0x0489, 0xe130), .driver_info = BTUSB_REALTEK | BTUSB_WIDEBAND_SPEECH }, + /* CSR BS8510 device using a Realtek USB vendor ID */ + { USB_DEVICE(0x0bda, 0x0002) }, + /* Realtek Bluetooth devices */ { USB_VENDOR_AND_INTERFACE_INFO(0x0bda, 0xe0, 0x01, 0x01), .driver_info = BTUSB_REALTEK }, -- 2.47.3