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[Alex Hung <1441335@xxxxxxxxxxxxxxxxxx>]

This seems to be in mainline kernel as below:

commit 387d37577fdd05e9472c20885464c2a53b3c945f
Author: Matthew Garrett <mjg59@xxxxxxxxxx>
Date:   Tue Apr 7 11:07:00 2015 -0700

    PCI: Don't clear ASPM bits when the FADT declares it's unsupported
    
    Communications with a hardware vendor confirm that the expected behaviour
    on systems that set the FADT ASPM disable bit but which still grant full
    PCIe control is for the OS to leave any BIOS configuration intact and

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https://bugs.launchpad.net/bugs/1441335

Title:
  PCI: Don't clear ASPM bits when the FADT declares it's unsupported

Status in linux package in Ubuntu:
  Triaged

Bug description:
  Matthew Garrett developed a patch to make Linux's ASPM support match
  reality. Please backport this to Ubuntu's 3.13, 3.16 and 3.19 kernels.

  This should offer power savings and would match Windows behavior.

  Please see the submission at <https://lkml.org/lkml/2015/4/7/781>.

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