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Without BTUSB_REALTEK, the device enumerates and HCI comes up, but btrtl never loads rtl8851bu_fw.bin, so discovery finds no devices. /sys/kernel/debug/usb/devices reports for this device: T: Bus=01 Lev=01 Prnt=01 Port=10 Cnt=02 Dev#= 3 Spd=12 MxCh= 0 D: Ver= 1.00 Cls=e0(wlcon) Sub=01 Prot=01 MxPS=64 #Cfgs= 1 P: Vendor=13d3 ProdID=3626 Rev= 0.00 S: Manufacturer=Realtek S: Product=Bluetooth Radio S: SerialNumber=00e04c000001 C:* #Ifs= 2 Cfg#= 1 Atr=e0 MxPwr=500mA I:* If#= 0 Alt= 0 #EPs= 3 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb E: Ad=81(I) Atr=03(Int.) MxPS= 16 Ivl=1ms E: Ad=02(O) Atr=02(Bulk) MxPS= 64 Ivl=0ms E: Ad=82(I) Atr=02(Bulk) MxPS= 64 Ivl=0ms I:* If#= 1 Alt= 0 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb E: Ad=03(O) Atr=01(Isoc) MxPS= 0 Ivl=1ms E: Ad=83(I) Atr=01(Isoc) MxPS= 0 Ivl=1ms Tested on Dell Precision 7820 (Fedora 44, kernel 7.2.4) with the combo RTL8851BE Wi-Fi/BT card. After the quirk, dmesg shows: Bluetooth: hci0: RTL: examining hci_ver=0c hci_rev=000b lmp_ver=0c lmp_subver=8851 Bluetooth: hci0: RTL: loading rtl_bt/rtl8851bu_fw.bin Bluetooth: hci0: RTL: fw version 0x048ad230 and LE discovery/pairing works (Logitech M720 Triathlon). Signed-off-by: Martin Luker-Brown --- drivers/bluetooth/btusb.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index 83d122de5..91e739c96 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -549,6 +549,7 @@ static const struct usb_device_id quirks_table[] = { { USB_DEVICE(0x0bda, 0xb850), .driver_info = BTUSB_REALTEK }, { USB_DEVICE(0x13d3, 0x3600), .driver_info = BTUSB_REALTEK }, { USB_DEVICE(0x13d3, 0x3601), .driver_info = BTUSB_REALTEK }, + { USB_DEVICE(0x13d3, 0x3626), .driver_info = BTUSB_REALTEK }, { USB_DEVICE(0x0489, 0xe112), .driver_info = BTUSB_REALTEK | BTUSB_WIDEBAND_SPEECH }, -- 2.53.0