Arch Linux

Lars Stokholm

Member

From: Denmark

Registered: 2009-03-17

Posts: 223

options in /etc/modprobe.d/*.conf has no effect

I would rather have these options in /etc/modprobe.d/* than in /boot/grub/menu.lst, but setting them in modprobe.d seems to have no effect. What's wrong?

[root@x220 ~]# cat /etc/modprobe.d/i915.conf 
options i915 i915_enable_rc6=1
options i915 i915_enable_fbc=1
options i915 lvds_downclock=1

[root@x220 ~]# head /sys/module/i915/parameters/* | egrep -A1 "(i915_|downclock)"
==> /sys/module/i915/parameters/i915_enable_fbc <==
-1
--
==> /sys/module/i915/parameters/i915_enable_rc6 <==
-1
--
==> /sys/module/i915/parameters/lvds_downclock <==
0

Setting them from menu.lst works just perfectly.

Gusar

Member

Registered: 2009-08-25

Posts: 3,605

Re: options in /etc/modprobe.d/*.conf has no effect

Do you have the i915 module inside the initramfs? If yes, is the i915.conf file also there?

Lars Stokholm

Member

From: Denmark

Registered: 2009-03-17

Posts: 223

Re: options in /etc/modprobe.d/*.conf has no effect

Do you have the i915 module inside the initramfs? If yes, is the i915.conf file also there?

RIght! I forgot to add it to mkinitcpio.conf. Thanks!

But that leads to another question. I also have this file:

[root@x220 ~]# cat /etc/modprobe.d/mei.conf 
blacklist mei

But this works without adding it to mkinitcpio.conf. Why is that? What's the difficerence between module options and blacklisting of modules in that respect?

Gusar

Member

Registered: 2009-08-25

Posts: 3,605

Re: options in /etc/modprobe.d/*.conf has no effect

Is mei in in the initramfs? Probably not. That's the difference - a module loaded from the initramfs also needs it's configurations there.

Lars Stokholm

Member

From: Denmark

Registered: 2009-03-17

Posts: 223

Re: options in /etc/modprobe.d/*.conf has no effect

That makes sense. Thank you.

bassu

Member

Registered: 2011-12-21

Posts: 90

Re: options in /etc/modprobe.d/*.conf has no effect

And you could also write all options in the first line after "options [module]" in conf file instead of three lines.

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The greatest threat to knowledge is not ignorance - it is the illusion of knowledge!

WonderWoofy

Member

From: Los Gatos, CA

Registered: 2012-05-19

Posts: 8,414

Re: options in /etc/modprobe.d/*.conf has no effect

I see you just dumped the /sys path of i915, it might be easier to use systool.

 # systool -m i915 -av 

Of course, then you need root access (otherwise the parameters don't show up).