Public bug reported:
SCO is built into the bluetooth module and is present. The issue is that
the SCO connection fails during negotiation - this is the BlueZ 5.83 bug
causing segfaults.
ProblemType: Bug
DistroRelease: Ubuntu 25.10
Package: bluez 5.83-1~exp1ubuntu0.1
ProcVersionSignature: Ubuntu 6.17.0-8.8-generic 6.17.2
Uname: Linux 6.17.0-8-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.33.1-0ubuntu3
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Tue Jan 13 11:22:03 2026
InstallationDate: Installed on 2025-01-23 (355 days ago)
InstallationMedia: Ubuntu 22.04.4 LTS "Jammy Jellyfish" - Release amd64
(20240220)
InterestingModules: rfcomm bnep btusb bluetooth
MachineType: LENOVO 21N5
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.17.0-8-generic
root=UUID=6fc1d498-51f7-4f68-964d-1890c4293e1e ro quiet splash
i915.panel_ignore_lid=1
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
vt.handoff=7
SourcePackage: bluez
UpgradeStatus: Upgraded to questing on 2025-12-09 (34 days ago)
dmi.bios.date: 05/13/2024
dmi.bios.release: 1.22
dmi.bios.vendor: LENOVO
dmi.bios.version: P5CN22WW
dmi.board.asset.tag: NO Asset Tag
dmi.board.name: LNVNB161216
dmi.board.vendor: LENOVO
dmi.board.version: NO DPK
dmi.chassis.asset.tag: NO Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: ThinkBook 16p G5 IRX
dmi.ec.firmware.release: 1.22
dmi.modalias:
dmi:bvnLENOVO:bvrP5CN22WW:bd05/13/2024:br1.22:efr1.22:svnLENOVO:pn21N5:pvrThinkBook16pG5IRX:rvnLENOVO:rnLNVNB161216:rvrNODPK:cvnLENOVO:ct10:cvrThinkBook16pG5IRX:skuLENOVO_MT_21N5_BU_idea_FM_ThinkBook16pG5IRX:
dmi.product.family: ThinkBook 16p G5 IRX
dmi.product.name: 21N5
dmi.product.sku: LENOVO_MT_21N5_BU_idea_FM_ThinkBook 16p G5 IRX
dmi.product.version: ThinkBook 16p G5 IRX
dmi.sys.vendor: LENOVO
hciconfig:
hci0: Type: Primary Bus: USB
BD Address: C4:47:4E:19:EA:F5 ACL MTU: 1021:4 SCO MTU: 96:6
UP RUNNING PSCAN
RX bytes:71246 acl:799 sco:0 events:6177 errors:0
TX bytes:1613296 acl:2367 sco:0 commands:3576 errors:0
modified.conffile..etc.bluetooth.input.conf: [deleted]
modified.conffile..etc.bluetooth.network.conf: [deleted]
mtime.conffile..etc.bluetooth.main.conf: 2026-01-13T11:18:10.723378
** Affects: bluez (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug questing wayland-session
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https://bugs.launchpad.net/bugs/2138286
Title:
BlueZ 5.83 (experimental) has bugs causing segfaults when establishing
HFP/SCO connections
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