How to set module options in-kernel?

schuay · 2008-12-09 15:56:10

Setting module options is usually done via /etc/modprobe.d/xxx..

How can I set the options when the .. err.. modules are compiled into the kernel?

I tried adding the following to my kernel line, but it changed nothing:

cfg80211.ieee80211_regdom=AT

I tried writing it using

su
echo AT > /sys/module/cfg80211/parameters/ieee80211_regdom

which gives me a permission denied error.

sudo sysctl -A | grep cfg doesn't show any results..

What's the proper way to do this?

Thanks in advance!

Last edited by schuay (2008-12-09 15:57:10)

fwojciec · 2008-12-09 16:00:54

schuay wrote:

I tried writing it using
su
echo AT > /sys/module/cfg80211/parameters/ieee80211_regdom
which gives me a permission denied error.

Maybe you have "noclobber" option set in your .bashrc? This option prevents echo/cat from overwriting existing files...

TjPhysicist · 2008-12-09 22:53:49

you may want to do >> (append) instead of > (write/create new).

klixon · 2008-12-10 08:41:18

You could try using sysctl. It is, in principle, designed for what you asked... Don't use it myself, but this should get you going:

sysctl -a | grep ieee80211.regdom # this should help you find the proper one
sysctl -w <insert response from above>="AT"

You can store these changes in /etc/sysctl.conf

Arch Linux