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Without this entry in quirks_table, btusb binds via the generic Bluetooth class match but never sets the BTUSB_REALTEK quirk, so btrtl_setup_realtek() is never called and the rtl8852bu firmware patch is never loaded. As a result HCI works (hci0 UP RUNNING), but RF reception is non-functional: inquiry and LE scan find nothing and pairing is impossible. Other Fujitsu OEM rebrands of Realtek chips are already in quirks_table (0x04c5/0x165c, 0x04c5/0x1675, 0x04c5/0x161f). Add 0x04c5/0x1670 in the same "Realtek 8852BE Bluetooth devices" block, alongside 0x04c5/0x165c. USB descriptors of the device: Bus 001 Device 004: ID 04c5:1670 Fujitsu, Ltd Bluetooth Radio bDeviceClass 224 Wireless bDeviceSubClass 1 Radio Frequency bDeviceProtocol 1 Bluetooth iManufacturer 1 Realtek iProduct 2 Bluetooth Radio Tested on Fujitsu LIFEBOOK E5512A (Ryzen 7 PRO 5875U, Ubuntu 25.10, kernel 6.17.0-29-generic). After the patch: Bluetooth: hci0: RTL: examining hci_ver=0b hci_rev=000b lmp_ver=0b lmp_subver=8852 Bluetooth: hci0: RTL: rom_version status=0 version=1 Bluetooth: hci0: RTL: loading rtl_bt/rtl8852bu_fw.bin Bluetooth: hci0: RTL: loading rtl_bt/rtl8852bu_config.bin Bluetooth: hci0: RTL: fw version 0x098b154b Bluetooth: hci0: AOSP extensions version v1.00 Scanning, pairing and A2DP audio playback to BT headphones all work after the firmware patch is loaded. Signed-off-by: Jaroslav Srba --- drivers/bluetooth/btusb.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index 7f5fce93d..93fcc02e0 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -543,6 +543,8 @@ static const struct usb_device_id quirks_table[] = { BTUSB_WIDEBAND_SPEECH }, { USB_DEVICE(0x04c5, 0x165c), .driver_info = BTUSB_REALTEK | BTUSB_WIDEBAND_SPEECH }, + { USB_DEVICE(0x04c5, 0x1670), .driver_info = BTUSB_REALTEK | + BTUSB_WIDEBAND_SPEECH }, { USB_DEVICE(0x04ca, 0x4006), .driver_info = BTUSB_REALTEK | BTUSB_WIDEBAND_SPEECH }, { USB_DEVICE(0x0cb8, 0xc549), .driver_info = BTUSB_REALTEK | -- 2.51.0