Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: linux (Ubuntu)
Status: New => Confirmed
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https://bugs.launchpad.net/bugs/2076407
Title:
Title: Bluetooth 5.4 Adapter (Ugreen CM749) Not Functioning on Ubuntu
20.04 with Kernel 6.x Description: The Bluetooth 5.4 adapter Ugreen
CM749 is not functioning on Ubuntu 20.04 with Kernel 6.x. The adapter
is detected by the system but fails to initialize, showing a
"Connection timed out (110)" error when attempting to bring up the
interface. The Bluetooth 5.0 dongle works without issues on the same
system. Steps to Reproduce: 1. Plugged in the Ugreen CM749 Bluetooth
5.4 adapter. 2. Ran `hciconfig hci0 up` to bring up the Bluetooth
interface. 3. Observed the error "Connection timed out (110)" in the
terminal. 4. Checked the dmesg logs and found repeated Bluetooth
errors. Expected Behavior: The Bluetooth 5.4 adapter should
initialize correctly, allowing for Bluetooth functionality such as
pairing and connecting devices. Actual Behavior: The Bluetooth 5.4
adapter fails to initialize, with the interface staying down and
connection attempts timing out. Additional Information: - Kernel
Version: 6.10.2-061002-generic - Ubuntu Version: 20.04 - Hardware
Information: *-network:1 description: Bluetooth device
product: Realtek Bluetooth Adapter vendor: Realtek
Semiconductor Co., Ltd. physical id: 0 bus info: usb@1:1
version: 1.00 - dmesg Output: [12345.6789] Bluetooth: hci0: Opcode
0x1005 failed: -110 - hciconfig Output: hci0: Type: Primary Bus: USB
BD Address: 00:A7:45:28:00:B3 ACL MTU: 0:0 SCO MTU: 0:0 DOWN RX
bytes:171 acl:0 sco:0 events:10 errors:0 TX bytes:276 acl:0 sco:0
commands:11 errors:0
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