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". -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. 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. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1017746/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
