Hi! Kirill, I based on Kernel v6.5.5 and updated drivers/bluetooth to the last version of bluetooth-next tree for a test with RTL8761BUV. The dmesg log and "hciconfig -a" are correct. Could you share the dmesg for your failure case? [56133.563293] usb 3-1: new full-speed USB device number 28 using xhci_hcd [56133.712559] usb 3-1: New USB device found, idVendor=0bda, idProduct=8771, bcdDevice= 2.00 [56133.712577] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3 [56133.712582] usb 3-1: Product: Bluetooth Radio [56133.712585] usb 3-1: Manufacturer: Realtek [56133.712588] usb 3-1: SerialNumber: 00E04C239987 [56133.737812] usbcore: registered new interface driver btusb [56133.742126] Bluetooth: hci0: RTL: examining hci_ver=0a hci_rev=000b lmp_ver=0a lmp_subver=8761 [56133.743115] Bluetooth: hci0: RTL: rom_version status=0 version=1 [56133.743124] Bluetooth: hci0: RTL: loading rtl_bt/rtl8761bu_fw.bin [56133.743754] Bluetooth: hci0: RTL: loading rtl_bt/rtl8761bu_config.bin [56133.743829] Bluetooth: hci0: RTL: cfg_sz 6, total sz 30210 [56133.913311] Bluetooth: hci0: RTL: fw version 0xdfc6d922 [56133.980299] Bluetooth: MGMT ver 1.22 hci0: Type: Primary Bus: USB BD Address: 98:A2:35:85:56:F1 ACL MTU: 1021:6 SCO MTU: 255:12 UP RUNNING RX bytes:1670 acl:0 sco:0 events:184 errors:0 TX bytes:33917 acl:0 sco:0 commands:184 errors:0 Features: 0xff 0xff 0xff 0xfe 0xdb 0xfd 0x7b 0x87 Packet type: DM1 DM3 DM5 DH1 DH3 DH5 HV1 HV2 HV3 Link policy: RSWITCH HOLD SNIFF PARK Link mode: PERIPHERAL ACCEPT Name: 'max-ThinkPad-X230' Class: 0x6c010c Service Classes: Rendering, Capturing, Audio, Telephony Device Class: Computer, Laptop HCI Version: 5.1 (0xa) Revision: 0xdfc6 LMP Version: 5.1 (0xa) Subversion: 0xd922 Manufacturer: Realtek Semiconductor Corporation (93) BRs, Max > -----Original Message----- > From: Bagas Sanjaya <bagasdotme@xxxxxxxxx> > Sent: Wednesday, October 4, 2023 7:56 AM > To: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx>; Hilda Wu > <hildawu@xxxxxxxxxxx> > Cc: alex_lu@xxxxxxxxxxxxxx; Luiz Augusto von Dentz > <luiz.von.dentz@xxxxxxxxx>; Max Chou <max.chou@xxxxxxxxxxx>; Marcel > Holtmann <marcel@xxxxxxxxxxxx>; Johan Hedberg > <johan.hedberg@xxxxxxxxx>; Juerg Haefliger > <juerg.haefliger@xxxxxxxxxxxxx>; Linux Bluetooth > <linux-bluetooth@xxxxxxxxxxxxxxx>; Thorsten Leemhuis <linux@xxxxxxxxxxxxx>; > Linux Regressions <regressions@xxxxxxxxxxxxxxx>; Linux Kernel Mailing List > <linux-kernel@xxxxxxxxxxxxxxx> > Subject: Re: Regression: devcoredump patch broke Realtek usb bluetooth > adapter > > On Tue, Oct 03, 2023 at 09:20:38PM +0300, Kirill A. Shutemov wrote: > > Hi, > > > > Commit 044014ce85a1 ("Bluetooth: btrtl: Add Realtek devcoredump > > support") broke Realtek-based ASUS USB-BT500, ID 0b05:190e. > > > > Devices failed to connect. hciconfig showed a controller with all-zero > > BD address. > > What is its output then? And dmesg log? > > > > > I reverted the commit as well as bd003fb338af that depends on the commit. > > It made the problem go away. > > > > I know virtually nothing about bluetooth. Let me know what info you > > need to debug the issue. > > > > Hilda, it looks like this regression is caused by a commit of yours. Would you > like to take a look on it? > > Regardless, thanks for the regression report. I'm adding it to regzbot: > > #regzbot ^introduced: 044014ce85a17c > > -- > An old man doll... just what I always wanted! - Clara