Public bug reported:
I am running Kubuntu 24.04.5 amd64 with the HWE kernel stack.
This is a regression between Ubuntu HWE kernels 7.0.0-34-generic and
7.0.0-38-generic.
Working kernel
7.0.0-34-generic boots and operates normally on this system.
Failing kernel
7.0.0-38-generic consistently hangs during early boot. With the normal quiet
splash parameters, the last visible GRUB message is:
Loading initial ramdisk ...
Removing quiet splash and adding:
loglevel=7 ignore_loglevel
shows that the kernel actually progresses into hardware initialization before
hanging.
Near the end of the visible output are repeated ACPI errors involving:
\_SB.PC00.RP01.PXSX._DSM.USRG
AE_ALREADY_EXISTS
CreateBufferField failure
\_SB.PC00.RP01.PXSX._DSM
PCI device 0000:02:00.0, corresponding to that ACPI path, is:
NVIDIA Corporation AD103 [GeForce RTX 4070 Ti SUPER] [10de:2705]
However, these same ACPI _DSM / AE_ALREADY_EXISTS errors also occur when
booting the working 7.0.0-34-generic kernel. Under 7.0.0-34, boot continues
after them and the NVIDIA DRM driver initializes normally. Therefore I do not
believe the ACPI errors themselves are the regression.
Important diagnostic result
I edited the GRUB entry for 7.0.0-38-generic and added:
module_blacklist=nvidia,nvidia_drm,nvidia_modeset,nvidia_uvm,nouveau
systemd.unit=multi-user.target
With the NVIDIA-related kernel modules blacklisted, 7.0.0-38 boots successfully.
I can enter the LUKS disk-decryption password and the system reaches a
text-mode TTY. There is no graphical desktop, as expected because the NVIDIA
modules are blacklisted.
Therefore the 7.0.0-38 boot failure appears to be associated with
loading/initializing the NVIDIA driver rather than with the initramfs itself.
Repair attempts already performed
While booted into the working 7.0.0-34-generic kernel, I ran:
sudo dpkg --configure -a
sudo apt -f install
sudo update-initramfs -u -k 7.0.0-38-generic
sudo update-grub
This did not change the behavior. 7.0.0-38 still hangs when NVIDIA is allowed
to load.
Reproducibility
1. Boot 7.0.0-38-generic normally.
2. System hangs during early kernel boot.
3. Reboot and select 7.0.0-34-generic: system boots normally.
4. Boot 7.0.0-38-generic with NVIDIA-related modules blacklisted: system boots
successfully to a TTY.
The failure has been reproduced multiple times.
I am submitting this report while running another working kernel because
7.0.0-38-generic cannot boot normally far enough for me to run apport under
that kernel.
I have a photograph of the final console output from a failed 7.0.0-38 boot and
will attach it to this report.
In a sense, this is a security bug because I am forced to fall back to
7.0.0-34, which does not have all the security patches of -38. I'll also note
that -38 failing to boot does not make the option of switching to 26.04
attractive. My understanding is that the 26.04 upgrade would install -38,
possibly without a fallback.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.8.0-146-generic 6.8.0-146.146
ProcVersionSignature: Ubuntu 6.8.0-146.146-generic 6.8.12
Uname: Linux 6.8.0-146-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.28.3-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC2: pm 3474 F.... wireplumber
/dev/snd/controlC1: pm 3474 F.... wireplumber
/dev/snd/controlC0: pm 3474 F.... wireplumber
/dev/snd/seq: pm 3472 F.... pipewire
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Sat Oct 3 13:02:30 2026
HibernationDevice: RESUME=UUID=f2799cf1-38b5-43b9-80b1-9f330e95c354
InstallationDate: Installed on 2024-12-22 (651 days ago)
InstallationMedia: Kubuntu 24.04.1 LTS "Noble Numbat" - Release amd64 (20240827)
MachineType: CyberPowerPC GamingPC
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.8.0-146-generic
root=UUID=d7e17bac-b56c-4498-b5e0-e249bd682b7d ro quiet
cryptdevice=UUID=c8b193ba-0124-495f-a549-091eb877b76a:cryptroot
root=/dev/mapper/cryptroot splash
resume=UUID=f2799cf1-38b5-43b9-80b1-9f330e95c354 "acpi_osi=Windows 2022"
acpi_mask_gpe=0x6E vt.handoff=7
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-6.8.0-146-generic N/A
linux-backports-modules-6.8.0-146-generic N/A
linux-firmware 20240318.git3b128b60.0ubuntu3.1
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/29/2026
dmi.bios.release: 32.12
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 3212
dmi.board.asset.tag: Default string
dmi.board.name: Z890 MAX GAMING WIFI7
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: Rev 1.xx
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: Default string
dmi.chassis.version: Default string
dmi.modalias:
dmi:bvnAmericanMegatrendsInc.:bvr3212:bd07/29/2026:br32.12:svnCyberPowerPC:pnGamingPC:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnZ890MAXGAMINGWIFI7:rvrRev1.xx:cvnDefaultstring:ct3:cvrDefaultstring:skuCPPC-SYSTEM-US:
dmi.product.family: C Series
dmi.product.name: GamingPC
dmi.product.sku: CPPC-SYSTEM-US
dmi.product.version: System Version
dmi.sys.vendor: CyberPowerPC
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble
** Attachment added: "Output at which booting stops"
https://bugs.launchpad.net/bugs/2169427/+attachment/6005338/+files/7.0.0-38%20kernel%20freeze.jpg
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https://bugs.launchpad.net/bugs/2169427
Title:
Regression: 7.0.0-38-generic hangs during boot when NVIDIA driver
loads; boots successfully with NVIDIA modules blacklisted; 7.0.0-34
works
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