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 -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb 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 Status in linux package in Ubuntu: New Bug description: 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2161312/+subscriptions
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