MODPROBE.D(5)							    modprobe.d							     MODPROBE.D(5)

NAME

       modprobe.d - Configuration directory for modprobe

SYNOPSIS

       /usr/lib/modprobe.d/*.conf

       /etc/modprobe.d/*.conf

       /run/modprobe.d/*.conf

DESCRIPTION

       Because the modprobe command can add or remove more than one module, due to modules having dependencies, we need a method of specifying
       what options are to be used with those modules. All files underneath the /etc/modprobe.d directory which end with the .conf extension
       specify those options as required. They can also be used to create convenient aliases: alternate names for a module, or they can override
       the normal modprobe behavior altogether for those with special requirements (such as inserting more than one module).

       Note that module and alias names (like other module names) can have - or _ in them: both are interchangeable throughout all the module
       commands as underscore conversion happens automatically.

       The format of and files under modprobe.d is simple: one command per line, with blank lines and lines starting with '#' ignored (useful for
       adding comments). A '' at the end of a line causes it to continue on the next line, which makes the file a bit neater.

COMMANDS

       alias wildcard modulename
	   This allows you to give alternate names for a module. For example: "alias my-mod really_long_modulename" means you can use "modprobe
	   my-mod" instead of "modprobe really_long_modulename". You can also use shell-style wildcards, so "alias my-mod* really_long_modulename"
	   means that "modprobe my-mod-something" has the same effect. You can't have aliases to other aliases (that way lies madness), but
	   aliases can have options, which will be added to any other options.

	   Note that modules can also contain their own aliases, which you can see using modinfo. These aliases are used as a last resort (ie. if
	   there is no real module, install, remove, or alias command in the configuration).

       blacklist modulename
	   Modules can contain their own aliases: usually these are aliases describing the devices they support, such as "pci:123...". These
	   "internal" aliases can be overridden by normal "alias" keywords, but there are cases where two or more modules both support the same
	   devices, or a module invalidly claims to support a device that it does not: the blacklist keyword indicates that all of that particular
	   module's internal aliases are to be ignored.

       install modulename command...
	   This command instructs modprobe to run your command instead of inserting the module in the kernel as normal. The command can be any
	   shell command: this allows you to do any kind of complex processing you might wish. For example, if the module "fred" works better with
	   the module "barney" already installed (but it doesn't depend on it, so modprobe won't automatically load it), you could say "install
	   fred /sbin/modprobe barney; /sbin/modprobe --ignore-install fred", which would do what you wanted. Note the --ignore-install, which
	   stops the second modprobe from running the same install command again. See also remove below.

	   The long term future of this command as a solution to the problem of providing additional module dependencies is not assured and it is
	   intended to replace this command with a warning about its eventual removal or deprecation at some point in a future release. Its use
	   complicates the automated determination of module dependencies by distribution utilities, such as mkinitrd (because these now need to
	   somehow interpret what the install commands might be doing. In a perfect world, modules would provide all dependency information
	   without the use of this command and work is underway to implement soft dependency support within the Linux kernel.

	   If you use the string "$CMDLINE_OPTS" in the command, it will be replaced by any options specified on the modprobe command line. This
	   can be useful because users expect "modprobe fred opt=1" to pass the "opt=1" arg to the module, even if there's an install command in
	   the configuration file. So our above example becomes "install fred /sbin/modprobe barney; /sbin/modprobe --ignore-install fred
	   $CMDLINE_OPTS"

       options modulename option...
	   This command allows you to add options to the module modulename (which might be an alias) every time it is inserted into the kernel:
	   whether directly (using modprobe modulename or because the module being inserted depends on this module.

	   All options are added together: they can come from an option for the module itself, for an alias, and on the command line.

       remove modulename command...
	   This is similar to the install command above, except it is invoked when "modprobe -r" is run.

       softdep modulename pre: modules... post: modules...
	   The softdep command allows you to specify soft, or optional, module dependencies.  modulename can be used without these optional
	   modules installed, but usually with some features missing. For example, a driver for a storage HBA might require another module be
	   loaded in order to use management features.

	   pre-deps and post-deps modules are lists of names and/or aliases of other modules that modprobe will attempt to install (or remove) in
	   order before and after the main module given in the modulename argument.

	   Example: Assume "softdep c pre: a b post: d e" is provided in the configuration. Running "modprobe c" is now equivalent to "modprobe a
	   b c d e" without the softdep. Flags such as --use-blacklist are applied to all the specified modules, while module parameters only
	   apply to module c.

	   Note: if there are install or remove commands with the same modulename argument, softdep takes precedence.

COMPATIBILITY

       A future version of kmod will come with a strong warning to avoid use of the install as explained above. This will happen once support for
       soft dependencies in the kernel is complete. That support will complement the existing softdep support within this utility by providing
       such dependencies directly within the modules.

COPYRIGHT

       This manual page originally Copyright 2004, Rusty Russell, IBM Corporation. Maintained by Jon Masters and others.

SEE ALSO

       modprobe(8), modules.dep(5)

AUTHORS

       Jon Masters <jcm@jonmasters.org>
	   Developer

       Robby Workman <rworkman@slackware.com>
	   Developer

       Lucas De Marchi <lucas.demarchi@profusion.mobi>
	   Developer

kmod								    06/19/2012							     MODPROBE.D(5)