From: Dylan Eray Date: Thu, 19 Feb 2026 19:32:09 +0000 (+0100) Subject: Bluetooth: btusb: Add Lite-On 04ca:3807 for MediaTek MT7921 X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=67377cd38b89ce782ccdb83bda3f65a2def843cd;p=thirdparty%2Fkernel%2Flinux.git Bluetooth: btusb: Add Lite-On 04ca:3807 for MediaTek MT7921 Add USB device ID (04ca:3807) for a Lite-On Wireless_Device containing a MediaTek MT7921 (MT7920) Bluetooth chipset found in Acer laptops. Without this entry, btusb binds via the generic USB class-based wildcard match but never sets the BTUSB_MEDIATEK flag. This means btmtk never triggers firmware loading, and the driver sends a raw HCI Reset that the uninitialized chip cannot respond to, resulting in: Bluetooth: hci0: Opcode 0x0c03 failed: -110 The information in /sys/kernel/debug/usb/devices about the Bluetooth device is listed as the below: T: Bus=03 Lev=01 Prnt=01 Port=09 Cnt=01 Dev#=5 Spd=480 MxCh=0 P: Vendor=04ca ProdID=3807 Rev=1.00 S: Manufacturer=MediaTek Inc. S: Product=Wireless_Device S: SerialNumber=000000000 C: #Ifs= 3 Cfg#= 1 Atr=e0 MxPwr=100mA I: If#= 0 Alt= 0 #EPs= 3 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb I: If#= 1 Alt= 0 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb I: If#= 2 Alt= 0 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=(none) Reviewed-by: Paul Menzel Signed-off-by: Dylan Eray Signed-off-by: Luiz Augusto von Dentz --- diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index aeba026bdb42..d07db8e3a79d 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -707,6 +707,8 @@ static const struct usb_device_id quirks_table[] = { BTUSB_WIDEBAND_SPEECH }, { USB_DEVICE(0x04ca, 0x3804), .driver_info = BTUSB_MEDIATEK | BTUSB_WIDEBAND_SPEECH }, + { USB_DEVICE(0x04ca, 0x3807), .driver_info = BTUSB_MEDIATEK | + BTUSB_WIDEBAND_SPEECH }, { USB_DEVICE(0x04ca, 0x38e4), .driver_info = BTUSB_MEDIATEK | BTUSB_WIDEBAND_SPEECH }, { USB_DEVICE(0x13d3, 0x3568), .driver_info = BTUSB_MEDIATEK |