Server Fault is a question and answer site for system and network administrators. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

Where is this kernel flag (pcie_aspm) documented? I'm sure it does something, and I just turned it off to get wired Ethernet driver (e1000e) working.

share|improve this question

So, the first hit on Google for "pcie_aspm" is:

[patch] pci: document the pcie_aspm kernel parameter

and that documentation is in the current kernel Documentation/kernel-parameters.txt, where it says:

    pcie_aspm=      [PCIE] Forcibly enable or disable PCIe Active State Power
            off     Disable ASPM.
            force   Enable ASPM even on devices that claim not to support it.
                    WARNING: Forcing ASPM on may cause system lockups.

And in turn, google for "pcie active state power management" leads to, which explans that ASPM does pretty much what the name implies.

share|improve this answer
What's the difference between ASPM and ACPI, is this just ACPI for PCIE? – Evan Carroll Jan 24 '11 at 20:00
Is there anyway to turn ASPM for just my Ethernet device? What does ACPI do for PCIe without ASPM.. I'm just wanting to know the practical implications of ASPM, my wired ethernet device is supposed to support different power states.. that sounds awkward.. Is that even possible? – Evan Carroll Jan 24 '11 at 20:13

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.