Comment 17 for bug 1349740

This error message occurs when the kernel runs the root PCI bridge _OSC control method in your firmware and the execution fails, perhaps due to a bug in the firmware or perhaps it does not exist. The kernel hence cannot determine the features supported or capabilities provided by the device (as specified by your firmware) and hence has to disable PCIe ASPM (Active State Power Management).

The downside of Active State Power Management not being enabled is that the machine is less power efficient, however, one can force this on with the kernel boot parameter "pcie_aspm=force" however, forcing this on may cause system lockups.