modprobe

• Load kernel module
• Loading kernel modules manually (through modprobe) means you will have to modprobe every time you reboot
• Modprobe by default loads modules located at the following directories (usually .ko extension)
• /lib/modules/$(uname -r)
  • ./updates/dkms for dkms manually installed
  • ./kernel for modules built into the kernel
• /usr/lib/modules/$(uname -r)

find "/lib/modules/$(uname -r)" -type "f" -name "*.ko*"
find "/usr/lib/modules/$(uname -r)" -type "f" -name "*.ko*"

# Activate module
modprobe "module-name"
modprobe "bonding" # And module for network bonding
modprobe "v4l2loopback" exclusive_caps=1 max_buffers=2 # virtual video devices

# Remove module
modprobe -r "module"

# Display configuration of the modules
modprobe -c
modprobe -c | grep "module-name"

Automatic module loading with systemd

• To load modules upon start, modules must be defined in:
• /etc/modules-load.d/module-name.conf (preferred)
• /usr/lib/modules-load.d/module-name.conf (ok)
• /etc/modules (deprecated)

# e.g. /etc/modules-load.d/v4l2loopback.conf
# This file contains the names of kernel modules that should be loaded
# at boot time, one per line. Lines beginning with "#" are ignored.
v4l2loopback

Module default configuration

• Default configuration for the modules is stored at either
• /etc/modprobe.d
• /usr/lib/modprobe.d

# e.g., /etc/modprobe.d/v4l2loopback.conf
options v4l2loopback exclusive_caps=1 foo=bar

udev

• Udev rules folder

sudo cp "/usr/share/ddcutil/data/45-ddcutils-i2c.rules" "/etc/udev/rules.d" # Copy the udev rule for the new group to rules.d