Public bug reported:
System:
Kubuntu 24.04.4 LTS
HP ProBook 450 G8
Intel Tiger Lake-LP
Intel Tiger Lake Smart Sound Technology Audio Controller
NVIDIA GeForce MX450
Secure Boot enabled
Working kernel:
6.8.0-117-generic
Problematic kernel:
6.8.0-124-generic
Description:
Kernel 6.8.0-117 boots normally and reaches the desktop within seconds.
Kernel 6.8.0-124 appears to hang during boot. Investigation shows that
the kernel actually reaches userspace and starts systemd, but boot
stalls while waiting for udev device initialization.
Relevant logs from the 6.8.0-124 boot:
systemd-udev-settle.service waits for the full timeout period.
SDDM waits on systemd-udev-settle.service.
The only device repeatedly reported as delayed is the Tiger Lake SOF/HDA
audio subsystem.
Relevant messages:
skl_hda_dsp_generic: Worker processing SEQNUM=5607 is taking a long time
and later:
snd_hda_codec_realtek ... autoconfig for ALC236
On 6.8.0-117 the same audio stack initializes successfully within
approximately one second and no "taking a long time" messages appear.
Installed firmware:
firmware-sof-signed 2023.12.1-1ubuntu1.11
Current audio device:
sof-hda-dsp (Tiger Lake SOF audio)
This appears to be a regression introduced between 6.8.0-117 and
6.8.0-124 affecting SOF audio initialization on this hardware.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.8.0-117-generic 6.8.0-117.117
ProcVersionSignature: Ubuntu 6.8.0-117.117-generic 6.8.12
Uname: Linux 6.8.0-117-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.28.1-0ubuntu3.8
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: odin 1748 F.... pipewire
odin 1752 F.... wireplumber
/dev/snd/seq: odin 1748 F.... pipewire
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Wed Jun 10 12:08:50 2026
InstallationDate: Installed on 2024-11-10 (577 days ago)
InstallationMedia: Kubuntu 24.04.1 LTS "Noble Numbat" - Release amd64 (20240827)
MachineType: HP HP ProBook 450 G8 Notebook PC
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.8.0-117-generic
root=UUID=2129a761-7601-47e9-afb1-c943b56b2da5 ro quiet splash
resume=UUID=fd1fae9e-3a7c-414a-ad21-65b039f63618
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-6.8.0-117-generic N/A
linux-backports-modules-6.8.0-117-generic N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.27
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/28/2024
dmi.bios.release: 18.0
dmi.bios.vendor: HP
dmi.bios.version: T70 Ver. 01.18.00
dmi.board.name: 87E1
dmi.board.vendor: HP
dmi.board.version: KBC Version 33.2B.00
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.ec.firmware.release: 51.43
dmi.modalias:
dmi:bvnHP:bvrT70Ver.01.18.00:bd08/28/2024:br18.0:efr51.43:svnHP:pnHPProBook450G8NotebookPC:pvrSBKPF:rvnHP:rn87E1:rvrKBCVersion33.2B.00:cvnHP:ct10:cvr:sku4P3T6ES#ABV:
dmi.product.family: 103C_5336AN HP ProBook
dmi.product.name: HP ProBook 450 G8 Notebook PC
dmi.product.sku: 4P3T6ES#ABV
dmi.product.version: SBKPF
dmi.sys.vendor: HP
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble
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https://bugs.launchpad.net/bugs/2156338
Title:
Regression in 6.8.0-124-generic on HP ProBook 450 G8 (Tiger Lake)
causing boot stall during SOF audio initialization
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