Public bug reported:
Hello
Here is a bug occurring on my laptop. The analysis is from claude code. I hope
it is relevant & complete.
Thanks for your help.
Summary
System hangs permanently when entering suspend (s2idle) on kernel
7.0.0-28-generic; requires a hard power-off to recover. The exact same hardware
suspended and resumed reliably dozens of times over 8 days on kernel
7.0.0-27-generic. The regression appeared immediately after the machine booted
7.0.0-28 for the first time — first suspend attempt on the new kernel already
failed, and it failed again on the next boot.
Hardware
Machine: Dell Inspiron 14 5425
CPU: AMD Ryzen 7 5825U with Radeon Graphics
GPU: AMD/ATI Barcelo iGPU (integrated, PCI 04:00.0)
BIOS: 1.19.0 (2024-09-10)
Sleep mode: only s2idle is offered by the platform (/sys/power/mem_sleep →
[s2idle], no deep/S3 option available)
Software
Ubuntu 25.10 (Questing Quokka), KDE Plasma 6.5, Wayland session (kwin_wayland)
Working kernel: linux-image-7.0.0-27-generic (7.0.0-27.27)
Broken kernel: linux-image-7.0.0-28-generic (7.0.0-28.28)
Steps to reproduce
Boot into 7.0.0-28-generic.
Trigger suspend (via systemd Suspend action / closing lid / GUI power menu).
System freezes during or immediately after suspend entry: keyboard backlight
stays lit, no reaction to any key or the power button short-press, screen never
turns back on.
Only recovery is holding the power button for a hard shutdown.
Expected behavior
System suspends and resumes normally, as it did consistently on
7.0.0-27-generic.
Actual behavior
System never comes back from suspend. journalctl shows the boot ending abruptly
right after suspend entry, with no PM: suspend exit line and no orderly
shutdown sequence — consistent with a full system hang, not a clean poweroff.
Evidence from journalctl
Working kernel (7.0.0-27), representative sample out of ~40 successful cycles
between 2026-07-09 and 2026-07-17:
juil. 16 19:31:46 kernel: PM: suspend entry (s2idle)
juil. 17 14:48:21 kernel: PM: suspend exit
Failing kernel (7.0.0-28), first attempt, boot ends here with no further log
lines at all:
juil. 20 10:42:38 root[18433]: Dell wakeup sources disabled - ALL including
dock disconnect
juil. 20 10:42:38 systemd-sleep[18388]: Performing sleep operation 'suspend'...
juil. 20 10:42:38 kernel: PM: suspend entry (s2idle)
[-- nothing further; next boot is a cold boot, not a resume --]
Failing kernel (7.0.0-28), second attempt on a fresh boot, same pattern:
juil. 20 12:32:59 systemd-sleep[26074]: Performing sleep operation 'suspend'...
juil. 20 12:32:59 kernel: PM: suspend entry (s2idle)
[-- nothing further --]
Both failing boots are followed by a fresh cold boot (new boot ID in journalctl
--list-boots), confirming the machine was hard power-cycled rather than
resuming.
Workaround
Pinning the system to linux-image-7.0.0-27-generic (apt-mark hold) restores
reliable suspend/resume.
Additional notes
A local dell-suspend-fix.service (disables PCI/USB/BT/WMI wakeup sources before
sleep, standard workaround for this laptop's dock/eSATA wake-on-disconnect
quirk) is present and unchanged across both the working and failing kernel —
ruling it out as the cause.
Not the known 7.0.0-28.28 AMDGPU/HMM ROCm performance regression (that one is a
slowdown in compute workloads, not a hang) — this appears to be a separate,
undocumented issue in the same kernel build.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-28-generic 7.0.0-28.28
ProcVersionSignature: Ubuntu 7.0.0-28.28-generic 7.0.12
Uname: Linux 7.0.0-28-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Mon Jul 20 14:19:25 2026
InstallationDate: Installed on 2025-07-09 (376 days ago)
InstallationMedia: Kubuntu 25.04 "Plucky Puffin" - Release amd64 (20250417)
IwDevWlp3s0Link: Not connected.
MachineType: Dell Inc. Inspiron 14 5425
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-28-generic
root=UUID=b239c123-a9a4-4924-bfc7-38c39f92e79b ro quiet splash
acpi_backlight=native resume=UUID=871f8b5f-e842-4660-9c64-7661287c3695
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 2026-07-09 (11 days ago)
dmi.bios.date: 09/10/2024
dmi.bios.release: 1.19
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.19.0
dmi.board.name: 0J9C2M
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: 1.19.0
dmi.modalias:
dmi:bvnDellInc.:bvr1.19.0:bd09/10/2024:br1.19:svnDellInc.:pnInspiron145425:pvr1.19.0:rvnDellInc.:rn0J9C2M:rvrA00:cvnDellInc.:ct10:cvr1.19.0:sku0B46:pfaInspiron:
dmi.product.family: Inspiron
dmi.product.name: Inspiron 14 5425
dmi.product.sku: 0B46
dmi.product.version: 1.19.0
dmi.sys.vendor: Dell Inc.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2161312
Title:
System hangs on suspend (s2idle) with kernel 7.0.0-28-generic, works
fine on 7.0.0-27
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