Public bug reported:
After upgrading Ubuntu 24.04 from kernel 7.0.0-34-generic to
7.0.0-38-generic, I experienced the first complete hard system freeze on
this machine.
Hardware:
- Lenovo IdeaPad 320-15IKB
- Intel UHD Graphics 620 (Kaby Lake, PCI ID 8086:5917), using i915
- NVIDIA GeForce MX150, using the proprietary NVIDIA driver
- External 2560x1440 monitor running at 59.91 Hz
The same hardware and display configuration has been used for years
without this type of freeze.
Timeline:
- 2026-10-04 22:52: kernel 7.0.0-38.38~24.04.4 was installed, upgrading
linux-image-generic-hwe-24.04 from 7.0.0-34.34~24.04.1.
- The first hard freeze occurred during the following day / first period of
normal use with 7.0.0-38.
- There had been no such freezes with 7.0.0-34.
Symptoms:
- Display becomes completely frozen.
- Keyboard and mouse no longer respond.
- Audio continuously loops a very short portion of the last audio buffer.
- The system never recovers.
- A forced power-off/restart is required.
- NMI watchdog and kernel watchdog were both enabled
(`/proc/sys/kernel/nmi_watchdog = 1`, `/proc/sys/kernel/watchdog = 1`), but no
hard-lockup report was persisted.
During the affected boot, the kernel log contains:
i915 0000:00:02.0: [drm] *ERROR* Atomic update failure on pipe A
(start=790460 end=790461) time 246 us, min 1431, max 1439, scanline
start 1421, end 1443
There was also an earlier rejected display mode:
i915 0000:00:02.0: [drm] User-defined mode not supported:
"2560x1440": 144 ...
This does NOT represent the display mode normally in use. The external
monitor is normally running at 2560x1440 @ 59.91 Hz and has been used
this way for years.
Expected behavior:
The machine should remain stable as it did with kernel 7.0.0-34.
Actual behavior:
With 7.0.0-38, the machine experienced a complete unrecoverable hard freeze
requiring a forced power cycle.
This appears to be a regression introduced between Ubuntu kernel
7.0.0-34.34~24.04.1 and 7.0.0-38.38~24.04.4.
I can test additional Ubuntu kernels or upstream/mainline kernels if
needed.
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-7.0.0-38-generic 7.0.0-38.38~24.04.4
ProcVersionSignature: Ubuntu 7.0.0-38.38~24.04.4-generic 7.0.14
Uname: Linux 7.0.0-38-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.28.3-0ubuntu0.1
Architecture: amd64
CRDA: N/A
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Tue Oct 6 22:25:16 2026
InstallationDate: Installed on 2025-02-02 (611 days ago)
InstallationMedia: Ubuntu 24.04.1 LTS "Noble Numbat" - Release amd64
(20240827.1)
MachineType: LENOVO 81BG
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-7.0.0-38-generic
root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash
video=HDMI-A-1:2560x1440@144 vt.handoff=7
RelatedPackageVersions:
linux-restricted-modules-7.0.0-38-generic N/A
linux-backports-modules-7.0.0-38-generic N/A
linux-firmware 20240318.git3b128b60.0ubuntu3.1
SourcePackage: linux-hwe-7.0
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 10/23/2017
dmi.bios.release: 1.15
dmi.bios.vendor: LENOVO
dmi.bios.version: 6JCN15WW
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: Lenovo ideapad 320-15IKB
dmi.ec.firmware.release: 1.15
dmi.modalias:
dmi:bvnLENOVO:bvr6JCN15WW:bd10/23/2017:br1.15:efr1.15:svnLENOVO:pn81BG:pvrLenovoideapad320-15IKB:rvnLENOVO:rnLNVNB161216:rvrNODPK:cvnLENOVO:ct10:cvrLenovoideapad320-15IKB:skuLENOVO_MT_81BG_BU_idea_FM_ideapad320-15IKB:pfaideapad320-15IKB:
dmi.product.family: ideapad 320-15IKB
dmi.product.name: 81BG
dmi.product.sku: LENOVO_MT_81BG_BU_idea_FM_ideapad 320-15IKB
dmi.product.version: Lenovo ideapad 320-15IKB
dmi.sys.vendor: LENOVO
** Affects: linux-hwe-7.0 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble regression-update wayland-session
** Attachment added: "kernel-7.0.0-38-hard-freeze.log"
https://bugs.launchpad.net/bugs/2169758/+attachment/6006517/+files/kernel-7.0.0-38-hard-freeze.log
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https://bugs.launchpad.net/bugs/2169758
Title:
[regression] Hard system freeze with Intel UHD 620/i915 after update
to 7.0.0-38, preceded by "Atomic update failure on pipe A"
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