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Accepted
Tom Mercer
Asked: 2018-06-03 21:27:48 +0800 CST

Modules being ignored

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/etc/modules includes

bbswitch load_state=0

Every time, bbswitch isn't loaded, and I have to manually:

sudo modprobe bbswitch

Then run bbswitch command to toggle graphics card.

Why isn't it respecting load_state=0?

drivers bbswitch

1 Answers

  1. Best Answer

    Without knowing what distribution you are using, the following does apply at least for Ubuntu 16.04 and 18.04, since Ubuntu started to use systemd from 16.04 onwards.

    The old module-loader script /etc/init.d/kmod would allow to put module options into /etc/modules. systemd did replace this script with an own service systemd-modules-load.service. The new method does not allow putting module options into /etc/modules and only accepts the module names each per line.
    If you call /etc/init.d/kmod it will not execute the script but rather call the systemd service systemd-modules-load.service. Further it is better to get used to systemd as it is very unlikely that the old sys-v init scripts will ever experience a comeback and will rather be completely replaced.

    However, if you want to load the bbswitch module with a set of options you have to do the steps as follows.

    Make the module load at boot time.

    root@localhost:~# echo "bbswitch" >> /etc/modules

    Put your options into a /etc/modprobe.d file which is honored each time a module is loaded. So this should be even better to define module parameters. So create the file /etc/modprobe.d/bbswitch.conf and put in the line as follows.

    root@localhost:~# cat /etc/modprobe.d/bbswitch.conf
options bbswitch load_state=0
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