Same problem here on my system: ## System Configuration
| Component | Details | |---|---| | **CPU** | AMD Ryzen 9 9950X3D (16 cores, 32 threads) | | **Mainboard** | ASUS ProArt X870E-CREATOR WIFI (AMD X870E chipset) | | **RAM** | 64 GB DDR5-6000 | | **GPU** | ASUS Radeon RX 6600 Dual (AMD RDNA 2, open-source Mesa/amdgpu driver) | | **Storage** | WD Black SN850X 2 TB NVMe (system), WD Black SN850X 4 TB NVMe (data) | | **OS** | Ubuntu 26.04 LTS "Resolute Raccoon" | | **Affected kernel** | 7.0.0-29-generic | ## Problem Description After upgrading to kernel **7.0.0-29-generic**, both `shutdown` and `reboot` hang after the systemd shutdown sequence completes successfully. The monitors turn off, but the system remains powered on indefinitely and must be hard-powered off. ## Symptoms - `sudo systemctl poweroff` → systemd shutdown completes, monitors turn off, machine stays on - `sudo systemctl reboot` → same behaviour, machine does not reboot - `sudo systemctl poweroff --force` → same behaviour - Hard power-off and restart required in all cases ## Kernel Parameters Tested (No Effect) The following kernel parameters were added to `GRUB_CMDLINE_LINUX_DEFAULT` individually and in combination — none resolved the issue: - `acpi=force` - `reboot=acpi` - `noapic` ## Shutdown Log (last entries before hang) The systemd shutdown sequence completes without errors. The last recorded log entries are: ``` systemd[1]: Reached target poweroff.target - System Power Off. systemd[1]: Shutting down. systemd-shutdown[1]: Syncing filesystems and block devices. systemd-shutdown[1]: Sending SIGTERM to remaining processes... systemd-journald[1391]: Received SIGTERM from PID 1 (systemd-shutdow). systemd-udevd[1440]: Failed to remove file descriptor "config-serialization" from the store, ignoring: Connection refused dnsmasq[5318]: exiting on receipt of SIGTERM systemd-journald[1391]: Journal stopped ``` After `Journal stopped`, the system hangs indefinitely. ## ACPI Wakeup Sources All wakeup sources are enabled on S4 (excerpt): ``` GPP3 S4 *enabled pci:0000:00:01.4 GP17 S4 *enabled pci:0000:00:08.1 XHC0 S4 *enabled pci:0000:7c:00.3 XHC1 S4 *enabled pci:0000:7c:00.4 XHC2 S4 *enabled pci:0000:7d:00.0 GPP0 S4 *enabled pci:0000:00:01.1 SWUS S4 *enabled pci:0000:01:00.0 SWDS S4 *enabled pci:0000:02:00.0 ... ``` ## Network - Wake-on-LAN was enabled (`Wake-on: g`) on `enp13s0` — disabled as part of troubleshooting, no effect on the issue ## Workaround (not fully 100% safe) Boot permanently with kernel 7.0.0-28-generic by setting in `/etc/default/grub`: ``` GRUB_DEFAULT="Advanced options for Ubuntu>Ubuntu, with Linux 7.0.0-28-generic" ``` Then run `sudo update-grub`. Sometimes it works, sometimes not. :-( -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2163015 Title: System fails to power off / hangs on shutdown-reboot after upgrade to Kubuntu 26.04 (kernel 7.0) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2163015/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
