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Sun, 05 Jul 2026 11:29:05 +0200 From: cito@online.de To: linux-bluetooth@vger.kernel.org Cc: marcel@holtmann.org, luiz.dentz@gmail.com, linux-kernel@vger.kernel.org, Christoph Zwerschke , stable@vger.kernel.org Subject: [PATCH v2 1/2] Bluetooth: btusb: Add ASUS USB-BT540 for Realtek 8761CU Date: Sun, 5 Jul 2026 11:28:56 +0200 Message-ID: <20260705092857.27050-2-cito@online.de> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260704231312.340274-1-cito@online.de> References: <20260704231312.340274-1-cito@online.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:6Y2C078dbLzUplkGwj/StfQPs29Lr7oOl6ieE99t7kX5TUTokOy gn0Pe1EdQtQf/++bLpQk87zm2p6LvntFlXRWjU4ODfOCAYA78GO6ExHJTzkLWijo6uFY0Aw qevgAwXjB6PQF4dpiht/blOCm99kMYEO/rh16WVSjmPpQLZWGnzyu1x8siKw4o1SgSEPt2p aaHMTb3OooXGQGWbfATwQ== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:rv7MLk/UDlw=;e4VZkK24v8dwO8965z72Nbe2LAh JSPNcfYJy5sTp4BEIP6Gu4kZv+PxyXJWBb5iTy+MUVY1BkLj1WLH0cvRzGZqWt3GGhW0MPB2G Dx/1ZuRf2UAZQ78XTGX1NTmentQgWReSwx419SG1YNgqOcvwE7PUe38OZyoctFTH3NI9c/W2G RFEYgIbhHLHTEB922WNfX3dyk5fO9/orh65ODXGVfcmlziR7+HBNq9M5ttAqNz2Fjv9Z+9efk Xbe6gv8HZTLXXM+4RFjCy3PfcMKwGo5Tt2gD71Rlp/UydhAeRCG7XpF0ilrspFjAKlrF7qb8/ GK3MFVVKUS9M1uicc9XoeW4hTtjI6+vqsCz3UQXqKEdCicBfPlyT28D5c876yC3bJg2ZqUgLr vxy4YiEwKJcDSNeO0yXTFkX7tCR09pVVJ+nUbeeZAEQXKqf8rmbLMyGUBLLfAfA9B8wd3A3M9 IX3jHpU4HTFTGx6m294acIxn8MeSQIhcXbSBzSwUe1jmqVs222aKTpECrBzvnRpXL/Id17H1D O9dqVJL4EnujuSXXYr0PTXL1hLTD8gripwY4CdUncsIiWsNrVjelc6T1Wja/MAn4tgZK4rCtt JnqoGQVAdJrILa8eNiXNofUVSEMADondu8asaaw0nPW0qLwGZGIKWBO2MbBuXL1kS+ctf9VBo Z1YdApdc7juZ5gmnmt/6N89GeVby1ANoTh2qQT/Pu3k55McC9rHlXx8NgPj71Sgyozq1IoQ1H 7w750YF28UfWY1p2MacVnJ6ha0DtUOB2DSpm1aFJ0T7yoLaln1qwau3lKGz3NjplEKnSZ2qGt 3Q5WRzcOJXMb24PQLUHRC5HwR4csO5PDai8Df1f9i0Sl5J2EfU8iNVew13Touken8ABwXG7xm c34YWp9oNuh4kO1FIOQSzbGOX6iQBWG9A3aihYG4w3HHQlNrxxIPPQTxuF3WzYwJXFu4fr6kq mf5djK3FORw5nIm5EFlhQbVZby5513kX9ud35BErCkV0U64YdemTummldnNdQGZI385rSXtlU LY0vQM9kRkyV3NdM5clTVV69l89uk/1pL4ginJxiIFkdzIXpR9+pCHn36jGogUPjFFkK2jPp6 6g4S//ZA7KAKfNmlrXMy38fa1KBf8s6UK2zEt+j0Ursoiv7WRFsnXpmvPttyi5PR/h42mwuAn bIW1b8MsjpOj2P/G4QCoP+HvxPdb76MyLUaOrS98/7X4ovU5iJh+QE2B+sCRbo8ZbebiNm54F 4FUrY7/S2Epr67QGmC16QvD3zG40z/VYWgwh3BgNYgMV5SB24cx/Y+fdjdOzjOcBHhorOF3vq il/f/Tjcen+DvLgoBPJZ1oFFU2XWhLRayAnYgISzqvRYo6/vZaxZTz7nFbQs5HD+/sAswUgTS i5Yl/kJmDTdwFyp7O97h12gANFYtYyGQwjV5lyw678Rr76gVtGmvwxaSrO8zq0T4sINNhe48Q SZQ1O8oo2OJJyEwAbdRm2yjz2pn0pDeZGHm5Vl5lmN1J3gSwuyX4/+q+NZXH5OxD1Crn0fptm tq0LFQN/X7XrXnrEi5BL09DoTF6G6fscR0aKQDJllEiQiYmfjxA4ukRND1POMHzctlGH76KD0 V0cGEOTirECQG6dMUbqHECnKemzBVw2dm7ebwbB96cRU5/ZRdc7OfeYHfp8PeMCPzyjxbS/ww 1XWlI8zldiWyxM/vO1V95G4SXsJLRK6eHPnPpR3t15ULcO+ViYHOvwqwbmvYD6rYMsEoaV21n OgTtMjIyBCkqVLTDOlPwn2Y/EK+GLBxEZcecq+iGfV+SerjX/gwLGKDZnEIKrcrh6hr+4knua 3zHC0o+q44hpqa83Bwk0gaZ3DgZwHt4yJbqxGxtuPSsVYXRttXvSojMIwgGtYedG29LM0kPs9 fD/YMlmFemQhYvlH+N25mWHjezg8rUe34qlvHKlgimmWY/8SPY3MsmF0AAGo0oKEq0iG/th/X PfK9Tq7g== From: Christoph Zwerschke Add the vendor/product ID (0x0b05, 0x1bef) to the usb_device_id table for the Realtek RTL8761CU-based ASUS USB-BT540 adapter. It binds via the generic Bluetooth class today, so BTUSB_REALTEK is never set and the rtl8761cu firmware is not loaded, leaving the controller non-functional. With the entry the driver loads rtl_bt/rtl8761cu_fw.bin (already shipped b= y linux-firmware) and the adapter works (tested: A2DP and ASHA). Similar to commit bc597f0cc44f ("Bluetooth: btusb: Add TP-Link UB600 for Realtek 8761BUV"). Device info from /sys/kernel/debug/usb/devices: T: Bus=3D01 Lev=3D01 Prnt=3D01 Port=3D01 Cnt=3D01 Dev#=3D 22 Spd=3D12 M= xCh=3D 0 D: Ver=3D 1.10 Cls=3De0(wlcon) Sub=3D01 Prot=3D01 MxPS=3D64 #Cfgs=3D 1 P: Vendor=3D0b05 ProdID=3D1bef Rev=3D 2.00 S: Manufacturer=3DRealtek S: Product=3DBluetooth Controller C:* #Ifs=3D 2 Cfg#=3D 1 Atr=3De0 MxPwr=3D100mA I:* If#=3D 0 Alt=3D 0 #EPs=3D 3 Cls=3De0(wlcon) Sub=3D01 Prot=3D01 Driver= =3Dbtusb E: Ad=3D81(I) Atr=3D03(Int.) MxPS=3D 64 Ivl=3D1ms E: Ad=3D02(O) Atr=3D02(Bulk) MxPS=3D 64 Ivl=3D0ms E: Ad=3D82(I) Atr=3D02(Bulk) MxPS=3D 64 Ivl=3D0ms I:* If#=3D 1 Alt=3D 0 #EPs=3D 2 Cls=3De0(wlcon) Sub=3D01 Prot=3D01 Driver= =3Dbtusb E: Ad=3D83(I) Atr=3D01(Isoc) MxPS=3D 0 Ivl=3D1ms E: Ad=3D03(O) Atr=3D01(Isoc) MxPS=3D 0 Ivl=3D1ms I: If#=3D 1 Alt=3D 1 #EPs=3D 2 Cls=3De0(wlcon) Sub=3D01 Prot=3D01 Driver= =3Dbtusb E: Ad=3D83(I) Atr=3D01(Isoc) MxPS=3D 9 Ivl=3D1ms E: Ad=3D03(O) Atr=3D01(Isoc) MxPS=3D 9 Ivl=3D1ms I: If#=3D 1 Alt=3D 2 #EPs=3D 2 Cls=3De0(wlcon) Sub=3D01 Prot=3D01 Driver= =3Dbtusb E: Ad=3D83(I) Atr=3D01(Isoc) MxPS=3D 17 Ivl=3D1ms E: Ad=3D03(O) Atr=3D01(Isoc) MxPS=3D 17 Ivl=3D1ms I: If#=3D 1 Alt=3D 3 #EPs=3D 2 Cls=3De0(wlcon) Sub=3D01 Prot=3D01 Driver= =3Dbtusb E: Ad=3D83(I) Atr=3D01(Isoc) MxPS=3D 25 Ivl=3D1ms E: Ad=3D03(O) Atr=3D01(Isoc) MxPS=3D 25 Ivl=3D1ms I: If#=3D 1 Alt=3D 4 #EPs=3D 2 Cls=3De0(wlcon) Sub=3D01 Prot=3D01 Driver= =3Dbtusb E: Ad=3D83(I) Atr=3D01(Isoc) MxPS=3D 33 Ivl=3D1ms E: Ad=3D03(O) Atr=3D01(Isoc) MxPS=3D 33 Ivl=3D1ms I: If#=3D 1 Alt=3D 5 #EPs=3D 2 Cls=3De0(wlcon) Sub=3D01 Prot=3D01 Driver= =3Dbtusb E: Ad=3D83(I) Atr=3D01(Isoc) MxPS=3D 49 Ivl=3D1ms E: Ad=3D03(O) Atr=3D01(Isoc) MxPS=3D 49 Ivl=3D1ms I: If#=3D 1 Alt=3D 6 #EPs=3D 2 Cls=3De0(wlcon) Sub=3D01 Prot=3D01 Driver= =3Dbtusb E: Ad=3D83(I) Atr=3D01(Isoc) MxPS=3D 63 Ivl=3D1ms E: Ad=3D03(O) Atr=3D01(Isoc) MxPS=3D 63 Ivl=3D1ms Cc: stable@vger.kernel.org Signed-off-by: Christoph Zwerschke =2D-- drivers/bluetooth/btusb.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index e9b0b1dcc1d1..c15c7ab5bd2e 100644 =2D-- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -856,6 +856,10 @@ static const struct usb_device_id quirks_table[] =3D = { { USB_DEVICE(0x37ad, 0x0600), .driver_info =3D BTUSB_REALTEK | BTUSB_WIDEBAND_SPEECH }, =20 + /* Additional Realtek 8761CU Bluetooth devices */ + { USB_DEVICE(0x0b05, 0x1bef), .driver_info =3D BTUSB_REALTEK | + BTUSB_WIDEBAND_SPEECH }, + /* Additional Realtek 8821AE Bluetooth devices */ { USB_DEVICE(0x0b05, 0x17dc), .driver_info =3D BTUSB_REALTEK }, { USB_DEVICE(0x13d3, 0x3414), .driver_info =3D BTUSB_REALTEK }, =2D-=20 2.55.0