User Tools

Site Tools


linux:system:power-management:acpi

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):

pcie_aspm=

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.

pci=

  • 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.
linux/system/power-management/acpi.txt · Last modified: by oscar