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 a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2164635 Title: System completely freezes immediately after automatic resume from suspend To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2164635/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
