Just ran `sudo apport-collect 2167666` as requested - new hardware/kernel/package attachments should now be on this bug. Adding context for two fresh suspend hangs today that prompted that (system otherwise unchanged since the original report): Ubuntu 26.04.1 LTS, kernel 7.0.0-31-generic.
Both hangs match the "(b) NO PRECURSOR" pattern described in the attached notes.txt, not the WiFi-crash-adjacent pattern - and both occurred with both existing mitigations (d3cold_allowed=0 on 0000:00:14.3, and a delay-inhibitor daemon that unloads iwlwifi before NetworkManager's sleep teardown) confirmed active and working correctly. Neither helped. Hang 1: 2026-09-22 17:07:38 JST (08:07:38 UTC) - systemd-logind requested suspend; the WiFi-unload daemon ran cleanly (modprobe -r iwlwifi -> rc=0, confirmed unloaded, delay inhibitor released in time) - NetworkManager and the GNOME session both tore down normally for sleep - No iwlwifi crash (no "Microcode SW error", no "ADVANCED_SYSASSERT") anywhere earlier in this ~2.5 hour boot - this was the boot's first and only suspend attempt - Last log line: kernel: PM: suspend entry (s2idle) - nothing else ever logged. Screen went black, power LED stayed lit, unresponsive, required a forced power-off. Hang 2: 2026-09-22 17:16:00 JST (08:16:00 UTC), ~8 minutes after rebooting from Hang 1 - Same sequence: suspend requested, WiFi-unload daemon completed cleanly again, NetworkManager/GNOME teardown normal - Again zero iwlwifi crashes anywhere in this (short, ~6 minute) boot - Again ends dead at kernel: PM: suspend entry (s2idle), same symptom, same forced power-off Two back-to-back no-precursor hangs on two consecutive boots (i.e. the very next suspend attempt after recovering from the first one also hung, immediately) is a higher failure rate than the recent baseline for this pattern. Posting the exact sequencing in case it's useful alongside the fresh apport-collect data. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2167666 Title: Intel AX211 (0000:00:14.3) iwlwifi firmware crash (ADVANCED_SYSASSERT) after resume causes s2idle suspend to hang; does not reproduce on Windows 11 on same hardware To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-firmware/+bug/2167666/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
