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| </blockquote><!-- Documentation --> | | </blockquote><!-- Documentation --> |
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| = Locations = | | = Notes = |
| <blockquote> | | <blockquote> |
| {| class="wikitable" | | {| |
| |- | | |- |
| | <code>/etc/modprobe.d/*.conf</code> || load kernel modules on startup | | | [[linux kernel ring buffer]] |
| |- | | |- |
| | <code>/lib/modules/$(uname -r)/*</code> || kernel modules (modules.builtin lists builtin modules) | | | [[linux kernel configuration]] |
| | |- |
| | | [[linux kernel event queue]] |
| |- | | |- |
| |} | | |} |
| </blockquote><!-- locations --> | | </blockquote><!-- Notes --> |
| | |
| = Kernel Options =
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| <blockquote>
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| Your can add boot options for your kernel.<br>
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| The location depends on your bootloader, for <code>systemd-boot</code> it would be in a file like <code>/boot/loader/entries/archlinux.conf</code>.
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| | |
| <source lang="bash">
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| # /boot/loader/entries/archlinux.conf
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| | |
| # ...
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| options rdblacklist=nouveau nofb nomodeset
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| </source>
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| Some useful kernel options
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| <source lang="bash">
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| nofb # disable framebuffer
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| nomodeset # disable kernel modesetting (increased resolution)
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| </source>
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| </blockquote><!-- Kernel Options -->
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| | |
| = Kernel Modules =
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| <blockquote>
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| {| class="wikitable"
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| | <code>/etc/modprobe.d/*.conf</code> || location of kernel-module files
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| |}
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| | |
| == Managing Kernel Modules ==
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| <blockquote>
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| <source lang="bash">
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| lsmod # list loaded kernel modules
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| modinfo btusb # list kernel options for btusb
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| modprobe btusb # load 'btusb' kernel module
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| cat /lib/modules/$(uname -r)/modules.builtin # list builtin kernel modules
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| </source>
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| </blockquote><!-- Managing Kernel Modules -->
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| | |
| == automatically loading kernel modules ==
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| <blockquote>
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| Similar to other systemd files, you can gather a bunch of kernel modules in a single file.
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| The syntax of the file is a newline separated list of modules. Their names will be exactly
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| as they would be called by modprobe. A newline with a first character of '#', marks a comment.
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| /etc/modprobe.d/wiimote.conf
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| <source lang="bash">
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| # /etc/modprobe.d/{yourname}.conf
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| uinput
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| btusb
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| </source>
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| </blockquote><!-- automatically loading kernel modules -->
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| </blockquote><!-- Kernel Modules -->
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| | |
| = Dynamic Kernel Modules (DKMS) =
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| <blockquote>
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| DKMS packages include kernel modules that are recompiled every time a new kernel is installed.<br>
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| You can safely install/build these modules after an update without reboot, but you'll need to restart to use them (so the new kernel is used).
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| </blockquote><!-- Dynamic Kernel Modules (DKMS) -->
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| | |
| = Kernel Downgrades =
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| <blockquote>
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| Boot your distro off a USB stick, and chroot into your existing installation.
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| You'll need to uninstall all packages that are particular to your kernel version
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| like linux, linux-headers, virtualbox-host-modules, virtualbox-guest-modules.
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| | |
| <syntaxhighlight lang="bash">
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| # Connect to the internet
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| sudo mount /dev/sda2 /mnt
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| arch-chroot /mnt /bin/bash
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| cd /var/cache/pacman/pkg
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| pacman -Rs linux-3.9.7 linux-headers-3.9.7 virtualbox-host-modules virtualbox-guest-modules
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| pacman -U linux-3.7.1 linux-headers 3.7.1
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| exit
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| sudo reboot
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| </syntaxhighlight>
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| </blockquote> <!-- Kernel Downgrades -->
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