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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

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

** Also affects: linux via
   http://bugzilla.kernel.org/show_bug.cgi?id=85621
   Importance: Unknown
       Status: Unknown

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

** Tags added: kernel-bug-exists-upstream

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https://bugs.launchpad.net/bugs/1377596

Title:
  pcie_aspm.policy=powersave pcie_aspm=force does not enable L0sL1 (L0s
  L1) on each ASPM PCIe device

Status in The Linux Kernel:
  Unknown
Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  4) What happened instead
  ===============================================
  # dmesg | grep -e _OSC -e ASPM
  [    0.000000] PCIe ASPM is forcibly enabled
  [    0.085767] ACPI FADT declares the system doesn't support PCIe ASPM, so disable it
  [    0.116506] acpi PNP0A08:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI]
  [    0.116664] acpi PNP0A08:00: _OSC: platform does not support [PCIeHotplug PME]
  [    0.116764] acpi PNP0A08:00: _OSC: OS now controls [AER PCIeCapability]
  [    0.125997] acpi PNP0A08:00: Disabling ASPM (FADT indicates it is unsupported)
  # cat /proc/cmdline
  BOOT_IMAGE=/boot/vmlinuz-3.17.0-999-generic root=/dev/sda1 ro biosdevname=0 intel_pstate=enable ipv6.disabled=1 debug ignore_loglevel panic=10 pcie_aspm.policy=powersave pcie_aspm=force r8168.aspm=1 r8168.eee_enable=1 oops=panic
  # lspci -vvvv | grep ASPM
  LnkCap:	Port #2, Speed 5GT/s, Width x16, ASPM L0s L1, Exit Latency L0s <1us, L1 <8us
  LnkCtl:	ASPM Disabled; RCB 64 bytes Disabled- CommClk-
  LnkCap:	Port #1, Speed 5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <1us, L1 <4us
  LnkCtl:	ASPM L0s Enabled; RCB 64 bytes Disabled- CommClk-
  LnkCap:	Port #6, Speed 5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <512ns, L1 <16us
  LnkCtl:	ASPM L1 Enabled; RCB 64 bytes Disabled- CommClk+
  LnkCap:	Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s unlimited, L1 <64us
  LnkCtl:	ASPM L0s L1 Enabled; RCB 64 bytes Disabled- CommClk+

  3) What you expected to happen
  ===============================================
  # lspci -vvvv | grep ASPM
  LnkCap:	Port #2, Speed 5GT/s, Width x16, ASPM L0s L1, Exit Latency L0s <1us, L1 <8us
  LnkCtl:	ASPM L0s L1 Enabled; RCB 64 bytes Disabled- CommClk-
  LnkCap:	Port #1, Speed 5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <1us, L1 <4us
  LnkCtl:	ASPM L0s L1 Enabled; RCB 64 bytes Disabled- CommClk-
  LnkCap:	Port #6, Speed 5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s <512ns, L1 <16us
  LnkCtl:	ASPM L0s L1 Enabled; RCB 64 bytes Disabled- CommClk+
  LnkCap:	Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Exit Latency L0s unlimited, L1 <64us
  LnkCtl:	ASPM L0s L1 Enabled; RCB 64 bytes Disabled- CommClk+

  Corresponding PCIe devices:
  # lspci -s 00:01.00 -nn
  00:01.0 PCI bridge [0604]: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor PCI Express x16 Controller [8086:0c01] (rev 06)
  # lspci -s 00:1c.00 -nn
  00:1c.0 PCI bridge [0604]: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #1 [8086:8c10] (rev d5)
  # lspci -s 00:1c.05 -nn
  00:1c.5 PCI bridge [0604]: Intel Corporation 8 Series/C220 Series Chipset Family PCI Express Root Port #6 [8086:8c1a] (rev d5)
  # lspci -s 03:00.00 -nn
  03:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller [10ec:8168] (rev 11)

  Current workaround:
  ASPM L0s L1 Enabled on each PCIe device can be created using manually using the correct setpci commands. This reliably enables ASPM L0s and L1 saving 25% in power consumption when measured at wall over at least 8 hours:
  # setpci -s 00:01.00 0xB0.B=0x3 # Intel Xeon E3-1200 PCIe controller [8086:0c01]
  # setpci -s 00:1c.05 0x50.B=0x43 # Intel 8 series PCIe root port #6 [8086:8c1a]
  # setpci -s 00:1c.00 0x50.B=0x43 # Intel 8 series PCIe root port #1 [8086:8c10]
  # setpci -s 03:00.00 0x80.B=0x43 # Realtek Gigabit Ethernet [10ec:8168]

  
  2) The version of the package you are using
  ===============================================
  # uname -a
  Linux ubuntu14 3.17.0-999-generic #201409282205 SMP Mon Sep 29 02:06:39 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux

  1) The release of Ubuntu
  ===============================================
  Description:	Ubuntu 14.04.1 LTS
  Release:	14.04

  Version signature is missing due to:
  # cat /proc/version_signature
  cat: /proc/version_signature: No such file or directory

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