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URKkQ1pq9jOJYvbnSUT+mGv6SV27ve1yRvz7FS5XMGSHxiuX5LDEhgfHGoj+TzaBCbbzCiZ+oMt 7mPBvKgDpMNN2Ul4v+c1oVR1JPoahVAWL80w+q3cu/fyZ+IJ836UmL2i3at9DgZqgc3teNUN5Fo l7m7Skxv8SpRLsjZjag== X-Proofpoint-GUID: N6ty2dpP6aEPAFB806iN97Ad3UIEBb9A Hi Greg/Sasha, On 04/09/26 10:29 am, Greg Kroah-Hartman wrote: > 6.12-stable review patch. If anyone has any objections, please let me know. > > ------------------ > > From: Christoph Zwerschke > > commit 980084de4d9b25193398d89a1c0430ba3501b683 upstream. > > 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 by > 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=01 Lev=01 Prnt=01 Port=01 Cnt=01 Dev#= 22 Spd=12 MxCh= 0 > D: Ver= 1.10 Cls=e0(wlcon) Sub=01 Prot=01 MxPS=64 #Cfgs= 1 > P: Vendor=0b05 ProdID=1bef Rev= 2.00 > S: Manufacturer=Realtek > S: Product=Bluetooth Controller > C:* #Ifs= 2 Cfg#= 1 Atr=e0 MxPwr=100mA > I:* If#= 0 Alt= 0 #EPs= 3 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb > E: Ad=81(I) Atr=03(Int.) MxPS= 64 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=83(I) Atr=01(Isoc) MxPS= 0 Ivl=1ms > E: Ad=03(O) Atr=01(Isoc) MxPS= 0 Ivl=1ms > I: If#= 1 Alt= 1 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb > E: Ad=83(I) Atr=01(Isoc) MxPS= 9 Ivl=1ms > E: Ad=03(O) Atr=01(Isoc) MxPS= 9 Ivl=1ms > I: If#= 1 Alt= 2 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb > E: Ad=83(I) Atr=01(Isoc) MxPS= 17 Ivl=1ms > E: Ad=03(O) Atr=01(Isoc) MxPS= 17 Ivl=1ms > I: If#= 1 Alt= 3 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb > E: Ad=83(I) Atr=01(Isoc) MxPS= 25 Ivl=1ms > E: Ad=03(O) Atr=01(Isoc) MxPS= 25 Ivl=1ms > I: If#= 1 Alt= 4 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb > E: Ad=83(I) Atr=01(Isoc) MxPS= 33 Ivl=1ms > E: Ad=03(O) Atr=01(Isoc) MxPS= 33 Ivl=1ms > I: If#= 1 Alt= 5 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb > E: Ad=83(I) Atr=01(Isoc) MxPS= 49 Ivl=1ms > E: Ad=03(O) Atr=01(Isoc) MxPS= 49 Ivl=1ms > I: If#= 1 Alt= 6 #EPs= 2 Cls=e0(wlcon) Sub=01 Prot=01 Driver=btusb > E: Ad=83(I) Atr=01(Isoc) MxPS= 63 Ivl=1ms > E: Ad=03(O) Atr=01(Isoc) MxPS= 63 Ivl=1ms > > Cc: stable@vger.kernel.org > Signed-off-by: Christoph Zwerschke > Reviewed-by: Paul Menzel > Signed-off-by: Luiz Augusto von Dentz > Signed-off-by: Greg Kroah-Hartman > --- > drivers/bluetooth/btusb.c | 4 ++++ > 1 file changed, 4 insertions(+) > > --- a/drivers/bluetooth/btusb.c > +++ b/drivers/bluetooth/btusb.c > @@ -783,6 +783,10 @@ static const struct usb_device_id quirks > { USB_DEVICE(0x2b89, 0x6275), .driver_info = BTUSB_REALTEK | > BTUSB_WIDEBAND_SPEECH }, > > + /* Additional Realtek 8761CU Bluetooth devices */ > + { USB_DEVICE(0x0b05, 0x1bef), .driver_info = BTUSB_REALTEK | > + BTUSB_WIDEBAND_SPEECH }, > + I have run an AI-assisted backport review and it spotted an issue. I checked the finding against linux-6.12.y. Commit: 0412e718aa75 ("Bluetooth: btusb: Add ASUS USB-BT540 for Realtek 8761CU") correctly adds USB ID 0b05:1bef with BTUSB_REALTEK. Upstream had already gained commit: 4a23ce935f74 ("Bluetooth: btrtl: Add the support for RTL8761CUV"), which adds the RTL8761CU match, project ID, firmware names, and wildcard HCI-version handling. The 6.12.y btrtl.c has no RTL8761CU table entry and no rtl_bt/rtl8761cu_fw.bin mapping. btrtl_initialize() therefore leaves ic_info NULL, and btrtl_download_firmware() takes its "assuming no firmware upload needed" path. The new USB ID alone does not provide the intended RTL8761CU firmware support and may leave the adapter nonfunctional. I think 6.12.y misses commit: 4a23ce935f74 ("Bluetooth: btrtl: Add the support for RTL8761CUV"). Should we drop the backport ? Thoughts? thanks, Harshir > /* Additional Realtek 8821AE Bluetooth devices */ > { USB_DEVICE(0x0b05, 0x17dc), .driver_info = BTUSB_REALTEK }, > { USB_DEVICE(0x13d3, 0x3414), .driver_info = BTUSB_REALTEK }, > > >