Arch Linux

Hubro

Member

Registered: 2019-03-09

Posts: 32

[Solved] My modprobe.d folder doesn't appear to have any effect

I have two files in my /etc/modprobe.d directory:

10_bbswitch.conf:

options bbswitch load_state=0

50_blacklist.conf:

blacklist nouveau
blacklist nvidia

However, bbswitch makes no attempt to power off my discrete GPU, nor does it produce any output in dmesg ("sudo dmesg | grep bbswitch").

Additionally, neither nouveau or nvidia is actually blacklisted, so Linux the nvidia driver when I boot. Adding "modprobe.blacklist=nouveau,nvidia" to the linux command line arguments instead works as expected. It just seems like files in "/etc/modprobe.d" have absolutely on effect.

Am I wrong in assuming this should work? Have I misunderstood anything?

Last edited by Hubro (2022-07-09 16:21:14)

giannis-arch

Member

Registered: 2017-09-20

Posts: 20

Re: [Solved] My modprobe.d folder doesn't appear to have any effect

Have you regenerate the initramfs ?

Hubro

Member

Registered: 2019-03-09

Posts: 32

Re: [Solved] My modprobe.d folder doesn't appear to have any effect

Have you regenerate the initramfs ?

Do I have to do that every time I change a file in /etc/modprobe.d? :S

giannis-arch

Member

Registered: 2017-09-20

Posts: 20

Re: [Solved] My modprobe.d folder doesn't appear to have any effect

yes, of course...

Hubro

Member

Registered: 2019-03-09

Posts: 32

Re: [Solved] My modprobe.d folder doesn't appear to have any effect

yes, of course...

That's why they call it newbie corner. Thanks!

(It's not obvious for a newbie which files under /etc require a rebuild of something. I checked several Arch wiki articles, plus "man modprobe" and "man modprobe.d", and I never got the impression I needed to rebuild anything.)

seth

Member

From: Don't DM me only for attention

Registered: 2012-09-03

Posts: 74,257

Re: [Solved] My modprobe.d folder doesn't appear to have any effect

To be more precise, you need to do that to impact modules that you added (ex- or implicitly) to the initramfs.
For testing purposes, you can blacklist and provide module parameters as kernel parameter.
https://wiki.archlinux.org/title/Kernel_parameters
https://wiki.archlinux.org/title/Kernel … mmand_line
https://wiki.archlinux.org/title/Kernel … and_line_2

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