ACPI on Linux

ACPI is usually also implemented in the BIOS/Firmware. In case of buggy implementations it could conflict with Linux ACPI implementation, causing error in the journal. Apparently this is due to faulty communication between a PCI device, the motherboard, and the kernel.

There are three workarounds, which in all cases involve setting a kernel parameter (if you're using GRUB, here's how it's done):

Forcibly enable or ignore PCIe Active State Power Management.

• off : Don't touch ASPM configuration at all. Leave any configuration done by firmware unchanged.
• force : Enable ASPM even on devices that claim not to support it. WARNING: Forcing ASPM on may cause system lockups.

• nomsi: disables Message Signaled Interrupts. I'm not sure exactly what this is, but adding this parameter disables USB devices… so no go.

• noaer : this shoots the messenger, so to speak. Errors still occur, but they aren't reported, and system logs keep normal proportions.

• nommconf I've only recently heard about this one. It disables Memory-Mapped PCI Configuration Space, and reverts to the traditional handling of configuration space.

• https://wiki.archlinux.org/title/Power_management
• https://www.kernel.org/doc/Documentation/admin-guide/kernel-parameters.txt