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[Bug 1457876] [NEW] PCI: Don't clear ASPM bits when the FADT declares it's unsupported

 

*** This bug is a duplicate of bug 1441335 ***
    https://bugs.launchpad.net/bugs/1441335

Public bug reported:

== Vivid SRU ==
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 refuse to
touch the ASPM bits. This mimics the behaviour of Windows.

== Fix ==
~/linux$ git describe --contains 387d37577fdd05e9472c20885464c2a53b3c945f
v4.1-rc1~159^2^2~1

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

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: linux (Ubuntu Precise)
     Importance: Medium
         Status: Triaged

** Affects: linux (Ubuntu Trusty)
     Importance: Medium
         Status: Triaged

** Affects: linux (Ubuntu Utopic)
     Importance: Medium
         Status: Triaged

** Affects: linux (Ubuntu Vivid)
     Importance: Medium
         Status: Triaged

** Also affects: linux (Ubuntu Vivid)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu)
       Status: New => Fix Released

** Changed in: linux (Ubuntu Vivid)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu Vivid)
       Status: New => Triaged

** Also affects: linux (Ubuntu Precise)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Utopic)
   Importance: Undecided
       Status: New

** Also affects: linux (Ubuntu Trusty)
   Importance: Undecided
       Status: New

** Changed in: linux (Ubuntu Utopic)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu Utopic)
       Status: New => Triaged

** Changed in: linux (Ubuntu Trusty)
       Status: New => Triaged

** Changed in: linux (Ubuntu Trusty)
   Importance: Undecided => Medium

** Changed in: linux (Ubuntu Precise)
       Status: New => Triaged

** Changed in: linux (Ubuntu Precise)
   Importance: Undecided => Medium

** This bug has been marked a duplicate of bug 1441335
   PCI: Don't clear ASPM bits when the FADT declares it's unsupported

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https://bugs.launchpad.net/bugs/1457876

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

Status in linux package in Ubuntu:
  Fix Released
Status in linux source package in Precise:
  Triaged
Status in linux source package in Trusty:
  Triaged
Status in linux source package in Utopic:
  Triaged
Status in linux source package in Vivid:
  Triaged

Bug description:
  == Vivid SRU ==
  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 refuse to
  touch the ASPM bits. This mimics the behaviour of Windows.

  == Fix ==
  ~/linux$ git describe --contains 387d37577fdd05e9472c20885464c2a53b3c945f
  v4.1-rc1~159^2^2~1

  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

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