https://bugzilla.kernel.org/show_bug.cgi?id=220398 Bug ID: 220398 Summary: Bluetooth devices experience severe connection issues, frequent disconnections, and input lag in kernel 6.15.2, working fine in 6.15.1. Product: Drivers Version: 2.5 Hardware: AMD OS: Linux Status: NEW Severity: high Priority: P3 Component: Bluetooth Assignee: linux-bluetooth@xxxxxxxxxxxxxxx Reporter: dncp4312@xxxxxxxxx Regression: No Bluetooth Regression Bug Report Summary: Bluetooth devices experience severe connection issues, frequent disconnections, and input lag in kernel 6.15.2, working fine in 6.15.1. Kernel Versions: - Last working: 6.15.1 - First broken: 6.15.2 - Confirmed broken through: 6.15.8 (latest tested) - Distribution: Arch Linux (vanilla upstream kernel packages) Hardware Information: lsusb | grep -i bluetooth Bus 003 Device 002: ID 0bda:2852 Realtek Semiconductor Corp. Bluetooth Radio Tested bluetooth devices: - Sony WH-1000XM5 headphones (audio cutoffs ~5 times every 3 seconds) - Keychron K8 Pro keyboard (severe input lag, duplicate keystrokes) Symptoms: - Connection issues when pairing/connecting bluetooth devices - Frequent disconnections even during active use - Audio playback cuts off frequently with bluetooth headphones - Severe input lag with bluetooth keyboards - Multiple keystrokes being registered for single key presses - Issues affect all bluetooth device types (keyboards, headphones, etc.) Steps to Reproduce: 1. Connect any bluetooth device (keyboard, mouse, headphone) 2. Use device normally 3. Observe connection drops and input lag Expected Behavior: Stable bluetooth connections with normal input responsiveness (as seen in 6.15.1) Actual Behavior: Unreliable connections, frequent disconnects, severe input lag, duplicate keystrokes Bisection Results: Performed kernel bisection on Arch Linux: - linux-6.15.1: Bluetooth works normally - linux-6.15.2: Bluetooth exhibits all described issues - Regression introduced between these exact versions Error Logs: dmesg output: [ 1.619605] usb 3-1: Product: Bluetooth Radio [ 6.641878] Bluetooth: Core ver 2.22 [ 6.641900] NET: Registered PF_BLUETOOTH protocol family [ 6.641902] Bluetooth: HCI device and connection manager initialized [ 6.641905] Bluetooth: HCI socket layer initialized [ 6.641907] Bluetooth: L2CAP socket layer initialized [ 6.641912] Bluetooth: SCO socket layer initialized [ 6.761556] Bluetooth: hci0: RTL: examining hci_ver=0b hci_rev=000a lmp_ver=0b lmp_subver=8852 [ 6.763546] Bluetooth: hci0: RTL: rom_version status=0 version=1 [ 6.763551] Bluetooth: hci0: RTL: loading rtl_bt/rtl8852au_fw.bin [ 6.764910] Bluetooth: hci0: RTL: loading rtl_bt/rtl8852au_config.bin [ 6.765011] Bluetooth: hci0: RTL: cfg_sz 6, total sz 64499 [ 7.299548] Bluetooth: hci0: RTL: fw version 0xd9d617da [ 7.427557] Bluetooth: hci0: AOSP extensions version v1.00 [ 7.427563] Bluetooth: hci0: AOSP quality report is supported [ 7.493922] Bluetooth: BNEP (Ethernet Emulation) ver 1.3 [ 7.493926] Bluetooth: BNEP filters: protocol multicast [ 7.493930] Bluetooth: BNEP socket layer initialized [ 7.494833] Bluetooth: MGMT ver 1.23 [ 24.601860] Bluetooth: RFCOMM TTY layer initialized [ 24.601867] Bluetooth: RFCOMM socket layer initialized [ 24.601871] Bluetooth: RFCOMM ver 1.11 [ 51.185829] hid-sensor-hub 0005:054C:0DF0.0006: hidraw5: BLUETOOTH HID v2.41 Device [WH-1000XM5] on 10:6f:d9:24:c1:d2 [ 71.308004] hid-generic 0005:3434:0280.0007: input,hidraw5: BLUETOOTH HID v1.32 Keyboard [Keychron K8 Pro] on 10:6f:d9:24:c1:d2 [ 1577.292485] hid-generic 0005:3434:0280.0008: input,hidraw5: BLUETOOTH HID v1.32 Keyboard [Keychron K8 Pro] on 10:6f:d9:24:c1:d2 journalctl output: Aug 03 05:07:03 envy systemd[1]: Starting Bluetooth service... Aug 03 05:07:03 envy (uetoothd)[564]: bluetooth.service: ConfigurationDirectory 'bluetooth' already exists but the mode is different. (File system: 755 ConfigurationDirectoryMode: 555) Aug 03 05:07:03 envy bluetoothd[564]: Bluetooth daemon 5.83 Aug 03 05:07:03 envy systemd[1]: Started Bluetooth service. Aug 03 05:07:03 envy bluetoothd[564]: Starting SDP server Aug 03 05:07:03 envy bluetoothd[564]: Bluetooth management interface 1.23 initialized Aug 03 05:07:03 envy bluetoothd[564]: Battery Provider Manager created Aug 03 05:07:20 envy bluetoothd[564]: Endpoint registered: sender=:1.28 path=/MediaEndpoint/A2DPSource/ldac Aug 03 05:07:20 envy bluetoothd[564]: Endpoint registered: sender=:1.28 path=/MediaEndpoint/A2DPSink/aptx_hd Aug 03 05:07:20 envy bluetoothd[564]: Endpoint registered: sender=:1.28 path=/MediaEndpoint/A2DPSource/aptx_hd Aug 03 05:07:20 envy bluetoothd[564]: Endpoint registered: sender=:1.28 path=/MediaEndpoint/A2DPSink/aptx Aug 03 05:07:20 envy bluetoothd[564]: Endpoint registered: sender=:1.28 path=/MediaEndpoint/A2DPSource/aptx Aug 03 05:07:20 envy bluetoothd[564]: Endpoint registered: sender=:1.28 path=/MediaEndpoint/A2DPSink/aac Aug 03 05:07:20 envy bluetoothd[564]: Endpoint registered: sender=:1.28 path=/MediaEndpoint/A2DPSource/aac Aug 03 05:07:20 envy bluetoothd[564]: Endpoint registered: sender=:1.28 path=/MediaEndpoint/A2DPSink/opus_g Aug 03 05:07:20 envy bluetoothd[564]: Endpoint registered: sender=:1.28 path=/MediaEndpoint/A2DPSource/opus_g Aug 03 05:07:20 envy bluetoothd[564]: Endpoint registered: sender=:1.28 path=/MediaEndpoint/A2DPSink/sbc Aug 03 05:07:20 envy bluetoothd[564]: Endpoint registered: sender=:1.28 path=/MediaEndpoint/A2DPSource/sbc Aug 03 05:07:20 envy bluetoothd[564]: Endpoint registered: sender=:1.28 path=/MediaEndpoint/A2DPSource/aptx_ll_1 Aug 03 05:07:20 envy bluetoothd[564]: Endpoint registered: sender=:1.28 path=/MediaEndpoint/A2DPSource/aptx_ll_0 Aug 03 05:07:20 envy bluetoothd[564]: Endpoint registered: sender=:1.28 path=/MediaEndpoint/A2DPSource/aptx_ll_duplex_1 Aug 03 05:07:20 envy bluetoothd[564]: Endpoint registered: sender=:1.28 path=/MediaEndpoint/A2DPSource/aptx_ll_duplex_0 Aug 03 05:07:20 envy bluetoothd[564]: Endpoint registered: sender=:1.28 path=/MediaEndpoint/A2DPSource/faststream Aug 03 05:07:20 envy bluetoothd[564]: Endpoint registered: sender=:1.28 path=/MediaEndpoint/A2DPSource/faststream_duplex Aug 03 05:07:20 envy bluetoothd[564]: Endpoint registered: sender=:1.28 path=/MediaEndpoint/A2DPSink/opus_05 Aug 03 05:07:20 envy bluetoothd[564]: Endpoint registered: sender=:1.28 path=/MediaEndpoint/A2DPSource/opus_05 Aug 03 05:07:20 envy bluetoothd[564]: Endpoint registered: sender=:1.28 path=/MediaEndpoint/A2DPSink/opus_05_duplex Aug 03 05:07:20 envy bluetoothd[564]: Endpoint registered: sender=:1.28 path=/MediaEndpoint/A2DPSource/opus_05_duplex Aug 03 05:07:54 envy bluetoothd[564]: profiles/audio/avdtp.c:handle_unanswered_req() No reply to Close request Aug 03 05:07:54 envy bluetoothd[564]: No matching connection for device Additional Notes: Issue is reproducible across different bluetooth devices and persists after: - Bluetooth service restart - Module reload (btusb) - Clearing bluetooth cache - Device re-pairing Workaround: Using kernel 6.15.1 or linux-lts resolves all issues. -- You may reply to this email to add a comment. 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