[Bug 2164635] Re: System completely freezes immediately after automatic resume from suspend

I am attaching additional diagnostic data collected on 2026-09-03. The persistent journal contains six complete system hangs, each of which made the system entirely unresponsive and required a forced hardware restart. They have the same kernel signature. In each case, a `KMS thread` is blocked in uninterruptible `D` state on a semaphore likely held by `nvidia-modeset`; the stack trace repeatedly points to `nvWriteGpEntry [nvidia_modeset]`. The affected system is running Ubuntu 26.04, kernel `7.0.0-30-generic`, and `nvidia-driver-595-open` version `595.84-0ubuntu0.26.04.1` on an NVIDIA RTX 4050 Max-Q / AD107M GPU. The six incidents were recorded on 2026-08-10, 2026-08-11, 2026-08-12, 2026-08-25, 2026-09-01, and 2026-09-02. Each affected boot ended without a normal systemd shutdown sequence, consistent with requiring a forced restart. For the 2026-09-02 incident, the kernel continued reporting the blocked task for more than 1228 seconds; afterwards, several short presses of the physical power button were recorded, but systemd never began shutdown. I found no corresponding kernel panic, OOM event, NVMe/I/O failure, fatal PCIe error, or Machine Check Exception in the retained boots. The attached report contains the timestamps, representative kernel excerpt, and related NVIDIA ACPI/EDID warnings. ** Attachment added: "FEEDBACK.launchpad-2164635-nvidia-kms-hangs.md" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2164635/+attachment/5997276/+files/FEEDBACK.launchpad-2164635-nvidia-kms-hangs.md -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2164635 Title: System completely freezes immediately after automatic resume from suspend Status in linux package in Ubuntu: New Bug description: ## Summary The system completely freezes immediately after resuming from suspend. This has happened three times so far. In all observed cases, the machine had been suspended automatically due to inactivity for a long period. The machine resumed from suspend without user interaction. The lock screen was displayed normally, but the entire system was completely unresponsive. ## Expected behavior The system should resume from suspend and remain fully operational. ## Actual behavior Immediately after resume: * the lock screen is displayed normally; * mouse input does not work; * the built-in keyboard does not respond; * the graphical session does not respond; * the entire machine appears frozen. The only way to recover is a forced reboot using the physical power button. After rebooting, the system works normally again. ## Reproducibility Observed 3 times. Common pattern: 1. The machine remains inactive for a long period. 2. Ubuntu automatically enters suspend. 3. The machine remains suspended for more than about 30 minutes. 4. The machine resumes without user interaction. 5. Immediately after resume, the system is completely frozen. The problem has only been observed after long suspend periods. ## Environment * Ubuntu 26.04 LTS * GNOME * Wayland * Dell G15 5530 * Hybrid/balanced graphics mode * NVIDIA GPU * External HDMI monitor connected * External monitor configured as the primary display * Extended desktop * Laptop lid open * Connected to AC power * Bluetooth enabled ## Additional information No graphical corruption or rendering artifacts are visible. The lock screen looks normal despite the system being completely unresponsive. No other suspend/resume problem has been observed. Because the whole system freezes, it is not possible to collect diagnostic information while the problem is occurring. Diagnostic information from the boot affected by the freeze was collected immediately after the forced reboot and submitted through Apport. ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: linux-image-7.0.0-30-generic 7.0.0-30.30 ProcVersionSignature: Ubuntu 7.0.0-30.30-generic 7.0.12 Uname: Linux 7.0.0-30-generic x86_64 ApportVersion: 2.34.1-0ubuntu0.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: diego 5360 F.... pipewire diego 5368 F.... wireplumber /dev/snd/controlC0: diego 5368 F.... wireplumber /dev/snd/seq: diego 5360 F.... pipewire CasperMD5CheckResult: unknown CurrentDesktop: ubuntu:GNOME Date: Thu Aug 20 07:34:33 2026 InstallationDate: Installed on 2026-08-02 (17 days ago) InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1) Lsusb: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 002: ID 0bda:5522 Realtek Semiconductor Corp. Integrated_Webcam_HD Bus 001 Device 003: ID 187c:0551 Alienware Corporation AW-ELC Bus 001 Device 004: ID 8087:0026 Intel Corp. AX201 Bluetooth Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub MachineType: Dell Inc. Dell G15 5530 ProcEnviron: LANG=pt_BR.UTF-8 PATH=(custom, user) SHELL=/bin/bash TERM=xterm-256color XDG_RUNTIME_DIR=<set> ProcFB: 0 i915drmfb 1 nvidia-drmdrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-30-generic root=UUID=466e9a49-1cb8-4f82-9f43-588d2422dbe0 ro quiet splash crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/23/2026 dmi.bios.release: 1.33 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.33.0 dmi.board.name: 0KC8TC dmi.board.vendor: Dell Inc. dmi.board.version: A02 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.ec.firmware.release: 1.22 dmi.modalias: dmi:bvnDellInc.:bvr1.33.0:bd04/23/2026:br1.33:efr1.22:svnDellInc.:pnDellG155530:pvr:rvnDellInc.:rn0KC8TC:rvrA02:cvnDellInc.:ct10:cvr:sku0BF7:pfaGSeries: dmi.product.family: GSeries dmi.product.name: Dell G15 5530 dmi.product.sku: 0BF7 dmi.sys.vendor: Dell Inc. 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