Ask Ubuntu is a question and answer site for Ubuntu users and developers. Join them; it only takes a minute:

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

I would like to know if "pcie_aspm=force" is already enabled on kernel 3 or if it will be only for kernel 3.3 like the Phoronix website says. I would like to know because i want to enable it on my acer 3820tg to see if the battery lasts a little more. i'm using ubuntu 11.10 64 bit.

(ps: sorry for my bad english but i'm portuguese)


share|improve this question
up vote 1 down vote accepted

With the 3.1.1 kernel pciasmp is compiled into the kernel

grep ASPM /boot/config-3.1.1

pcie_aspm=force looks like a (kernel) boot option.

To enable that option, edit /etc/default/grub

# graphical
gksu gedit /etc/default/grub

# command line
sudo -e /etc/default/grub

Add that option in to the GRUB_CMDLINE_LINUX_DEFAULT line, after quiet and splash

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash pcie_aspm=force"

Update grub

sudo update-grub
share|improve this answer
Thanks ;) I know it's compiled into the kernel but what i want to know too is if that option is already enabled by default. I accept that answer too cause it has useful commands about how to enable it. – Celso Dec 27 '11 at 19:34
In theory, it should work automatically. If it does not, then you would specify options at boot. – bodhi.zazen Dec 27 '11 at 19:41

By their nature, a force option must be explicitly configured because it is enabling something that is dangerous, so no, it is not, and will not be set automatically.

share|improve this answer
Thanks :D that completes what was missing on bodhi.zazen answer. – Celso Dec 29 '11 at 0:45

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.