This seems to be in mainline kernel as below:
commit 387d37577fdd05e9472c20885464c2a53b3c945f
Author: Matthew Garrett <mj...@coreos.com>
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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