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[Dirk F <1017746@xxxxxxxxxxxxxxxxxx>]

This sort of thing can happen:

root:~# echo  default > /sys/module/pcie_aspm/parameters/policy
-bash: echo: write error: Operation not permitted

For instance, the pmutils script normally installed at /usr/lib/pm-
utils/power.d/pcie_aspm, which is executed on every change between mains
and battery operation, can exhibit such behaviour.

Even when pcie_aspm modes are offered the ability to set them may be
disabled, and the pcie_aspm sysfs interface doesn't offer a way to tell
that this is so.

See http://smackerelofopinion.blogspot.co.uk/2011/03/making-sense-of-
pcie-aspm.html for technical background on why setting the pcie_aspm
mode might be disabled.

In short "this behaviour is by design".

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https://bugs.launchpad.net/bugs/1017746

Title:
  /sys/module/pcie_aspm/parameters/policy not settable

Status in linux package in Ubuntu:
  Incomplete
Status in Debian:
  New

Bug description:
  From: http://ubuntuforums.org/showthread.php?t=2010191

  The parameters in /sys/module/pcie_aspm/parameters/policy are not
  settable.

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