Public bug reported: TITLE: [regression] CSR8510 USB Bluetooth dongle (0a12:0001) silently hangs after BLE mouse reconnect on 7.0 kernels; fine on 6.8 DESCRIPTION: Summary ------- Since upgrading to Ubuntu 26.04 (kernel 7.0), a CSR8510-based USB Bluetooth dongle stops working after a Bluetooth LE mouse sleeps and reconnects. The adapter stays "powered" and the mouse stays "Connected: yes" in bluetoothctl, but no input arrives, its uhid input device disappears, and new connections fail. Nothing is logged in dmesg or the bluetoothd journal when this happens. Only physically unplugging and replugging the dongle recovers it. Restarting bluetoothd or disconnecting/reconnecting the device does not. Booting the older 6.8 kernel with the same 26.04 userspace (same BlueZ, same dongle, same mouse) avoids the problem completely. Regression evidence ------------------- - 6.8.0-101-generic: 13 days uptime (Oct 27 - Nov 9), 20 mouse sleep/reconnect cycles, zero dongle hangs. - 7.0.0-38-generic: hung roughly daily (Oct 5 - Oct 27); dongle had to be re-plugged 8 times in one boot. - 7.0.0-42-generic: hung within ~50 minutes of boot (Nov 9). Disabling USB autosuspend (btusb enable_autosuspend=0, confirmed active, power/control=on) did NOT help on 7.0.0-38. Hardware -------- - Machine: HP EliteDesk 800 G3 DM 65W - Dongle: TP-Link UB400 (CSR8510) lsusb: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode) bcdDevice=88.91, no USB manufacturer/product strings dmesg: "Bluetooth: hci0: CSR: Setting up dongle with HCI ver=6 rev=22bb" "Bluetooth: hci0: LMP ver=6 subver=22bb; manufacturer=10" "Bluetooth: hci0: unexpected event for opcode 0x0000" (at every setup) Driver: btusb (both interfaces) - Mouse: generic "BT5.0 Mouse", BLE HID-over-GATT Modalias usb:v000Ep3412d0400, appearance 0x03c2 Software -------- - Ubuntu 26.04.1 LTS (resolute) - bluez 5.85-4ubuntu0.4 - Bad: linux-image-7.0.0-38-generic, linux-image-7.0.0-42-generic (7.0.0-42.42) - Good: linux-image-6.8.0-101-generic (6.8.0-101.101) Steps to reproduce ------------------ 1. Boot a 7.0 kernel with a CSR8510 dongle and pair a BLE mouse. 2. Leave the mouse idle until it sleeps (minutes to hours). 3. Move the mouse to wake it. Expected: mouse reconnects (as on 6.8). Actual: mouse does nothing; dongle is unresponsive until replugged. No kernel or bluetoothd errors are logged. Notes ----- Possibly related: reports of CSR 0a12:0001 breakage in btusb_setup_csr() on 7.0.x / 7.1.x upstream (CachyOS and Arch forums), although those show "Opcode ... failed: -110" at setup, which does not appear here: setup succeeds and the hang happens later. A btmon capture of the hang can be provided on request. ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: linux-image-7.0.0-42-generic 7.0.0-42.42 ProcVersionSignature: Ubuntu 7.0.0-42.42-generic 7.0.14 Uname: Linux 7.0.0-42-generic x86_64 ApportVersion: 2.34.1-0ubuntu0.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: jerry 2825 F.... wireplumber /dev/snd/controlC1: jerry 2825 F.... wireplumber /dev/snd/controlC0: jerry 2825 F.... wireplumber /dev/snd/seq: jerry 2816 F.... pipewire CRDA: N/A CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Mon Nov 9 16:44:49 2026 InstallationDate: Installed on 2024-02-11 (1003 days ago) InstallationMedia: Ubuntu 22.04.2 LTS "Jammy Jellyfish" - Release amd64 (20230223) MachineType: HP HP EliteDesk 800 G3 DM 65W ProcEnviron: LANG=en_US.UTF-8 PATH=(custom, no user) SHELL=/bin/bash TERM=tmux-256color XDG_RUNTIME_DIR=<set> ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-42-generic root=UUID=a397f20c-1215-48ea-af0b-fc85938b0709 ro quiet splash PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. SourcePackage: linux UpgradeStatus: Upgraded to resolute on 2026-10-06 (35 days ago) dmi.bios.date: 05/21/2018 dmi.bios.release: 2.19 dmi.bios.vendor: HP dmi.bios.version: P21 Ver. 02.19 dmi.board.name: 829A dmi.board.vendor: HP dmi.board.version: KBC Version 06.21 dmi.chassis.type: 35 dmi.chassis.vendor: HP dmi.ec.firmware.release: 6.33 dmi.modalias: dmi:bvnHP:bvrP21Ver.02.19:bd05/21/2018:br2.19:efr6.33:svnHP:pnHPEliteDesk800G3DM65W:pvr:rvnHP:rn829A:rvrKBCVersion06.21:cvnHP:ct35:cvr:skuY3A18AV:pfa103C_53307FHPEliteDesk: dmi.product.family: 103C_53307F HP EliteDesk dmi.product.name: HP EliteDesk 800 G3 DM 65W dmi.product.sku: Y3A18AV dmi.sys.vendor: HP ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug resolute wayland-session -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2173815 Title: CSR8510 USB Bluetooth dongle (0a12:0001) silently hangs after BLE mouse reconnect on 7.0 kernels; fine on 6.8 Status in linux package in Ubuntu: New Bug description: TITLE: [regression] CSR8510 USB Bluetooth dongle (0a12:0001) silently hangs after BLE mouse reconnect on 7.0 kernels; fine on 6.8 DESCRIPTION: Summary ------- Since upgrading to Ubuntu 26.04 (kernel 7.0), a CSR8510-based USB Bluetooth dongle stops working after a Bluetooth LE mouse sleeps and reconnects. The adapter stays "powered" and the mouse stays "Connected: yes" in bluetoothctl, but no input arrives, its uhid input device disappears, and new connections fail. Nothing is logged in dmesg or the bluetoothd journal when this happens. Only physically unplugging and replugging the dongle recovers it. Restarting bluetoothd or disconnecting/reconnecting the device does not. Booting the older 6.8 kernel with the same 26.04 userspace (same BlueZ, same dongle, same mouse) avoids the problem completely. Regression evidence ------------------- - 6.8.0-101-generic: 13 days uptime (Oct 27 - Nov 9), 20 mouse sleep/reconnect cycles, zero dongle hangs. - 7.0.0-38-generic: hung roughly daily (Oct 5 - Oct 27); dongle had to be re-plugged 8 times in one boot. - 7.0.0-42-generic: hung within ~50 minutes of boot (Nov 9). Disabling USB autosuspend (btusb enable_autosuspend=0, confirmed active, power/control=on) did NOT help on 7.0.0-38. Hardware -------- - Machine: HP EliteDesk 800 G3 DM 65W - Dongle: TP-Link UB400 (CSR8510) lsusb: ID 0a12:0001 Cambridge Silicon Radio, Ltd Bluetooth Dongle (HCI mode) bcdDevice=88.91, no USB manufacturer/product strings dmesg: "Bluetooth: hci0: CSR: Setting up dongle with HCI ver=6 rev=22bb" "Bluetooth: hci0: LMP ver=6 subver=22bb; manufacturer=10" "Bluetooth: hci0: unexpected event for opcode 0x0000" (at every setup) Driver: btusb (both interfaces) - Mouse: generic "BT5.0 Mouse", BLE HID-over-GATT Modalias usb:v000Ep3412d0400, appearance 0x03c2 Software -------- - Ubuntu 26.04.1 LTS (resolute) - bluez 5.85-4ubuntu0.4 - Bad: linux-image-7.0.0-38-generic, linux-image-7.0.0-42-generic (7.0.0-42.42) - Good: linux-image-6.8.0-101-generic (6.8.0-101.101) Steps to reproduce ------------------ 1. Boot a 7.0 kernel with a CSR8510 dongle and pair a BLE mouse. 2. Leave the mouse idle until it sleeps (minutes to hours). 3. Move the mouse to wake it. Expected: mouse reconnects (as on 6.8). Actual: mouse does nothing; dongle is unresponsive until replugged. No kernel or bluetoothd errors are logged. Notes ----- Possibly related: reports of CSR 0a12:0001 breakage in btusb_setup_csr() on 7.0.x / 7.1.x upstream (CachyOS and Arch forums), although those show "Opcode ... failed: -110" at setup, which does not appear here: setup succeeds and the hang happens later. A btmon capture of the hang can be provided on request. ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: linux-image-7.0.0-42-generic 7.0.0-42.42 ProcVersionSignature: Ubuntu 7.0.0-42.42-generic 7.0.14 Uname: Linux 7.0.0-42-generic x86_64 ApportVersion: 2.34.1-0ubuntu0.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: jerry 2825 F.... wireplumber /dev/snd/controlC1: jerry 2825 F.... wireplumber /dev/snd/controlC0: jerry 2825 F.... wireplumber /dev/snd/seq: jerry 2816 F.... pipewire CRDA: N/A CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Mon Nov 9 16:44:49 2026 InstallationDate: Installed on 2024-02-11 (1003 days ago) InstallationMedia: Ubuntu 22.04.2 LTS "Jammy Jellyfish" - Release amd64 (20230223) MachineType: HP HP EliteDesk 800 G3 DM 65W ProcEnviron: LANG=en_US.UTF-8 PATH=(custom, no user) SHELL=/bin/bash TERM=tmux-256color XDG_RUNTIME_DIR=<set> ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-42-generic root=UUID=a397f20c-1215-48ea-af0b-fc85938b0709 ro quiet splash PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. SourcePackage: linux UpgradeStatus: Upgraded to resolute on 2026-10-06 (35 days ago) dmi.bios.date: 05/21/2018 dmi.bios.release: 2.19 dmi.bios.vendor: HP dmi.bios.version: P21 Ver. 02.19 dmi.board.name: 829A dmi.board.vendor: HP dmi.board.version: KBC Version 06.21 dmi.chassis.type: 35 dmi.chassis.vendor: HP dmi.ec.firmware.release: 6.33 dmi.modalias: dmi:bvnHP:bvrP21Ver.02.19:bd05/21/2018:br2.19:efr6.33:svnHP:pnHPEliteDesk800G3DM65W:pvr:rvnHP:rn829A:rvrKBCVersion06.21:cvnHP:ct35:cvr:skuY3A18AV:pfa103C_53307FHPEliteDesk: dmi.product.family: 103C_53307F HP EliteDesk dmi.product.name: HP EliteDesk 800 G3 DM 65W dmi.product.sku: Y3A18AV dmi.sys.vendor: HP To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2173815/+subscriptions
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