Issue #657 has been updated by Sebastian Müller.
Pushed the fix to Gerrit (in the shared topton/adl devicetree, so it covers the x2e_n150): https://review.coreboot.org/c/coreboot/+/94028 Could you build master with it and confirm the IRQ 9 storm is gone on FreeBSD/OPNsense? If it holds up I'll note it here. ---------------------------------------- Bug #657: Alder Lake (x2e_n150) ACPI SCI (IRQ9) Interrupt Storm Escalation up to 180k/sec on FreeBSD/OPNsense https://ticket.coreboot.org/issues/657#change-2345 * Author: Zoomm Deka * Status: New * Priority: Normal * Target version: none * Start date: 2026-07-10 * Affected versions: main ---------------------------------------- Following up on the initial observation of interrupt storms on an Intel Alder Lake platform (x2e_n150 mainboard) running FreeBSD 14 / OPNsense 26.7 with a clean Libreboot/coreboot image: UART0 (IRQ4): Disabling the serial port via loader hints (hint.uart.0.disabled="1") successfully stopped the IRQ4 storm. ACPI SCI (IRQ9): The ACPI storm on IRQ9 escalated drastically post-boot, reaching a critical rate of 181,199 interrupts per second. Attempts to mitigate this via software (e.g., changing the trigger to edge mode using hw.acpi.sci.trigger="edge") were unsuccessful, indicating a persistent level-triggered assertion from the hardware/firmware side. This storm consumes significant CPU cycles, causing system degradation and immediate hard locks when USB devices or higher IO loads are introduced. Updated Data from vmstat -i: interrupt total rate irq9: acpi0 4241009125 181199 Context & Platform Details: Mainboard: x2e_n150 (Intel Alder Lake) OS: FreeBSD 14.1-RELEASE / OPNsense 26.7 Firmware: Clean Libreboot/coreboot compilation (includes commit 4988900789 soc/intel/alderlake: Fix PCI IRQ tables). The issue points to an unhandled GPE (General Purpose Event) loop or incorrect SCI routing configuration within the Alder Lake ACPI implementation for this specific board variant. -- You have received this notification because you have either subscribed to it, or are involved in it. To change your notification preferences, please click here: https://ticket.coreboot.org/my/account _______________________________________________ coreboot mailing list -- [email protected] To unsubscribe send an email to [email protected]
