** Description changed: SUMMARY iwlwifi (Intel Wi-Fi 6E AX211) firmware crashes repeatedly with "Microcode SW error detected. Restarting 0x0." on kernel 7.0 (Ubuntu 26.04 LTS). Regression: the same hardware was fully stable on Ubuntu 25.10 (kernel 6.17). The crash makes the machine unusable within minutes of normal use, and is reliably triggered by network - activity (e.g. fetching mail in Thunderbird). + activity (mainly fetching mail in Thunderbird on multiple accounts). HARDWARE - Laptop: Lenovo Yoga Slim 6 14IAP8 (machine type 82WU) - CPU: Intel Alder Lake (12th gen, hybrid) - Wi-Fi: Intel Wi-Fi 6E AX211 160MHz (PCI 0000:00:14.3) - - Detected crf-id 0x400410, cnv-id 0x80400 + - Detected crf-id 0x400410, cnv-id 0x80400 - BIOS: Lenovo KTCN39WW (2023-08-18) SOFTWARE - Ubuntu 26.04 LTS (upgraded from 25.10) - Affected kernels: 7.0.0-22-generic AND 7.0.0-15-generic - (both crash identically) + (both crash identically) - Wi-Fi firmware: 89.123cf747.0 so-a0-gf-a0-89.ucode (op_mode iwlmvm) - linux-firmware: 20260319.git217ca6e4.1ubuntu (latest available) CRASH SIGNATURE iwlwifi 0000:00:14.3: Microcode SW error detected. Restarting 0x0. WARNING: drivers/net/wireless/intel/iwlwifi/iwl-trans.h:1097 - at iwl_pcie_irq_handle_error+0x1ba/0x200 [iwlwifi] + at iwl_pcie_irq_handle_error+0x1ba/0x200 [iwlwifi] iwlwifi 0000:00:14.3: Start IWL Error Log Dump: iwlwifi 0000:00:14.3: 0x00000B03 | IML/ROM error/state iwlwifi 0000:00:14.3: 0x60000000 | FSEQ_ERROR_CODE Also observed just before the crash: iwlwifi 0000:00:14.3: [0] Got MSI-X interrupt before we have Rx queues - REGRESSION DETAILS + "REGRESSION" : SOME DETAILS - Ubuntu 25.10 with kernel 6.17.0-x: STABLE, no Wi-Fi crashes. - After upgrade to Ubuntu 26.04 (kernel 7.0.0-x): crashes within - minutes, every session. + minutes, every session. - Identical crash on both 7.0.0-15 and 7.0.0-22, so it is not - specific to a single 7.0 build. + specific to a single 7.0 build. WORKAROUNDS TESTED (none resolved the crash) - intel_iommu=off : removed the accompanying DMAR/IOMMU faults from - the log, but the iwlwifi Microcode SW error still occurs. + the log, but the iwlwifi Microcode SW error still occurs. - iommu=pt : same result (DMAR faults gone, Wi-Fi crash remains). - modprobe options iwlwifi power_save=0 uapsd_disable=1 11n_disable=8 : - no effect on the crash. + no effect on the crash. - Booting the older installed kernel (7.0.0-15): same crash. The DMAR/IOMMU faults therefore appear to be a side effect, not the root cause. The root cause is the iwlwifi/firmware initialization failure (IML/ROM error, FSEQ_ERROR_CODE) on the 7.0 kernel. EXPECTED Wi-Fi remains stable under normal use, as it did on kernel 6.17 (Ubuntu 25.10). ACTUAL Repeated iwlwifi microcode crashes, Wi-Fi drops and full system instability within minutes. ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: linux-image-7.0.0-22-generic 7.0.0-22.22 ProcVersionSignature: Ubuntu 7.0.0-22.22-generic 7.0.0 Uname: Linux 7.0.0-22-generic x86_64 ApportVersion: 2.34.0-0ubuntu2 Architecture: amd64 AudioDevicesInUse: - USER PID ACCESS COMMAND - /dev/snd/controlC0: nicolas 5182 F.... pipewire - nicolas 5202 F.... wireplumber - /dev/snd/seq: nicolas 5182 F.... pipewire + USER PID ACCESS COMMAND + /dev/snd/controlC0: nicolas 5182 F.... pipewire + nicolas 5202 F.... wireplumber + /dev/snd/seq: nicolas 5182 F.... pipewire CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Sat Jun 20 03:38:54 2026 InstallationDate: Installed on 2025-02-06 (498 days ago) InstallationMedia: Ubuntu 24.10 "Oracular Oriole" - Release amd64 (20241009.4) MachineType: LENOVO 82WU ProcEnviron: - LANG=fr_FR.UTF-8 - PATH=(custom, no user) - SHELL=/bin/bash - TERM=xterm-256color - XDG_RUNTIME_DIR=<set> + LANG=fr_FR.UTF-8 + PATH=(custom, no user) + SHELL=/bin/bash + TERM=xterm-256color + XDG_RUNTIME_DIR=<set> ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-22-generic root=UUID=3b9eac6f-0152-405e-9800-5d424a52c8ed ro quiet splash iommu=off crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M SourcePackage: linux UpgradeStatus: Upgraded to resolute on 2026-05-19 (32 days ago) dmi.bios.date: 08/18/2023 dmi.bios.release: 1.39 dmi.bios.vendor: LENOVO dmi.bios.version: KTCN39WW dmi.board.asset.tag: NO Asset Tag dmi.board.name: LNVNB161216 dmi.board.vendor: LENOVO dmi.board.version: SDK0T76463 WIN dmi.chassis.asset.tag: NO Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Yoga Slim 6 14IAP8 dmi.ec.firmware.release: 1.39 dmi.modalias: dmi:bvnLENOVO:bvrKTCN39WW:bd08/18/2023:br1.39:efr1.39:svnLENOVO:pn82WU:pvrYogaSlim614IAP8:rvnLENOVO:rnLNVNB161216:rvrSDK0T76463WIN:cvnLENOVO:ct10:cvrYogaSlim614IAP8:skuLENOVO_MT_82WU_BU_idea_FM_YogaSlim614IAP8:pfaYogaSlim614IAP8: dmi.product.family: Yoga Slim 6 14IAP8 dmi.product.name: 82WU dmi.product.sku: LENOVO_MT_82WU_BU_idea_FM_Yoga Slim 6 14IAP8 dmi.product.version: Yoga Slim 6 14IAP8 dmi.sys.vendor: LENOVO
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