Update after more debugging: I no longer think this is a kernel regression. Evidence now points to a platform (BIOS/CSME) FSEQ failure on the wifi side of the CNVi.
What I found: - I installed the signed 6.8.0-135 kernel from noble alongside 7.0. Same failure there with the older so-a0-hr-b0-86 firmware: ADVANCED_SYSASSERT 0x2010210B, RT ucode -110. So kernel version is not the variable, even though 6.8 worked when I tested 22.04.5 months ago. - Also tried the newest firmware build from linux-firmware git (89.735b75a4.0, core103-40 release). Identical assert. - The error dump shows a non-zero FSEQ_ERROR_CODE (0x60000000, changed to 0x20000000 after a full power drain) and FSEQ_CNVIO_INIT_VERSION = 0. So the platform-side CNVi init sequence itself is failing before the driver gets involved. - Bluetooth on the same CNVi module reports "Fseq status: Success", so the module itself is alive. - Windows still brings the wifi up fine (verified today), and warm rebooting from Windows into Ubuntu doesn't help iwlwifi. - One thing I noticed in Windows: since around the time this started, the wifi icon only appears a second or two after boot, which it never used to do. Looks like the Windows driver is recovering the device from this bad state on every boot, while iwlwifi can't. - A PCI function-level reset (echo 1 > /sys/bus/pci/devices/0000:00:14.3/reset) before loading the driver doesn't help either. - BIOS is P10CFL.031.250901.HQ (2025-09-01). The timing of that BIOS update roughly coincides with when wifi stopped working here — I originally blamed the 6.17 HWE kernel because both arrived around the same time. Samsung Update offers nothing newer, and loading BIOS setup defaults didn't change anything. Also ruled out: cold boot with power drain, disabling Windows fast startup. This might be the same underlying issue as bug #2136972 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2148754 Title: Intel AX211 (Raptor Lake CNVi) fails to initialize, error -110 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-hwe-6.17/+bug/2148754/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
