Comment 0 for bug 962038

ASPM doesn't work completely on Asus Zenbook UX31 (regression from kernel 3.1 with pcie_aspm=force)

The issue reported at [1] holds true. With 12.04 kernel, the following is seen at the moment:
$ sudo lspci -vv | grep ASPM
LnkCap: Port #0, Speed unknown, Width x0, ASPM unknown, Latency L0 <64ns, L1 <1us
LnkCtl: ASPM Disabled; Disabled- Retrain- CommClk-
LnkCap: Port #1, Speed 5GT/s, Width x1, ASPM L0s L1, Latency L0 <1us, L1 <16us
LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- Retrain- CommClk-
LnkCap: Port #2, Speed 5GT/s, Width x1, ASPM L0s L1, Latency L0 <512ns, L1 <16us
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+
LnkCap: Port #4, Speed 5GT/s, Width x1, ASPM L0s L1, Latency L0 <512ns, L1 <16us
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+
LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Latency L0 <4us, L1 <64us
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+
LnkCap: Port #0, Speed 5GT/s, Width x1, ASPM L0s L1, Latency L0 unlimited, L1 unlimited
LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk+

With two enable-aspm [2] calls, as follows:

ROOT_COMPLEX="00:1c.1"
ENDPOINT="02:00.0"
---
ROOT_COMPLEX="00:1c.3"
ENDPOINT="03:00.0"

the following is gotten instead and everything continues to function fine:

$ sudo lspci -vv | grep ASPM
LnkCap: Port #0, Speed unknown, Width x0, ASPM unknown, Latency L0 <64ns, L1 <1us
LnkCtl: ASPM Disabled; Disabled- Retrain- CommClk-
LnkCap: Port #1, Speed 5GT/s, Width x1, ASPM L0s L1, Latency L0 <1us, L1 <16us
LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- Retrain- CommClk-
LnkCap: Port #2, Speed 5GT/s, Width x1, ASPM L0s L1, Latency L0 <512ns, L1 <16us
LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- Retrain- CommClk+
LnkCap: Port #4, Speed 5GT/s, Width x1, ASPM L0s L1, Latency L0 <512ns, L1 <16us
LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- Retrain- CommClk+
LnkCap: Port #0, Speed 2.5GT/s, Width x1, ASPM L0s L1, Latency L0 <4us, L1 <64us
LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- Retrain- CommClk+
LnkCap: Port #0, Speed 5GT/s, Width x1, ASPM L0s L1, Latency L0 unlimited, L1 unlimited
LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- Retrain- CommClk+

[1] http://ubuntuforums.org/showthread.php?t=1865577&page=130#post11771228
[2] http://bombadil.infradead.org/~mcgrof/scripts/enable-aspm