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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)

Celso

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2 Answers 2

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
CONFIG_PCIEASPM=y
# CONFIG_PCIEASPM_DEBUG is not set

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
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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.

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

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