[SOLVED]How to pass parameters to an auto-loaded module?

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DooBeDooBeDo · Post by **DooBeDooBeDo** » Tue Feb 04, 2014 8:29 pm

I've just got a new DVB card (Tevii S464). At boot it auto-loads a bunch of modules:

$ modprobe --show-depends cx8802
insmod /lib/modules/3.10.17-gentoo/kernel/drivers/media/v4l2-core/videobuf-core.ko
insmod /lib/modules/3.10.17-gentoo/kernel/drivers/media/v4l2-core/videobuf-dma-sg.ko
insmod /lib/modules/3.10.17-gentoo/kernel/drivers/media/common/btcx-risc.ko
insmod /lib/modules/3.10.17-gentoo/kernel/drivers/media/common/tveeprom.ko
insmod /lib/modules/3.10.17-gentoo/kernel/drivers/media/pci/cx88/cx88xx.ko <-- I need to pass an argument to this one
insmod /lib/modules/3.10.17-gentoo/kernel/drivers/media/pci/cx88/cx8802.ko

Can anyone tell me how to do this in the sanest way?

albright · Post by **albright** » Tue Feb 04, 2014 8:54 pm

adding the module (or a set of them) to /etc/modprobe.d/blacklist.conf

and then loading it (or them) via /etc/conf.d/modules might work

for example (taken from my own files)

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/etc/modprobe.d $ cat blacklist.conf 
#blacklist e1000e
blacklist thinkpad_acpi

and

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/etc/conf.d $ cat modules
modules="thinkpad_acpi snd_hda_intel snd_hda_codec_realtek"
module_thinkpad_acpi_args="fan_control=1"
module_snd_hda_intel_args="index=2"

DooBeDooBeDo · Post by **DooBeDooBeDo** » Tue Feb 04, 2014 11:11 pm

Despite the modules being blacklisted they were loaded anyway. I've created a /etc/local.d/tevii_s464.start

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/sbin/modprobe -r cx8800 cx8802 cx88xx btcx_risc videobuf_dma_sg videobuf_core tveeprom

/sbin/modprobe cx88xx card=86
/sbin/modprobe cx8800
/sbin/modprobe cx8802

Not ideal but it works :/. I'd like to know how to do this properly though. It's been quite a while since I had to mess around like this...

BitJam · Post by **BitJam** » Wed Feb 05, 2014 9:19 am

This is explained in "man modprobe.d":

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       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. [...]

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 modprobemodulename or because the module being inserted depends on
	   this module.

This man page also explains how to blacklist modules.

xaviermiller · Post by **xaviermiller** » Wed Feb 05, 2014 9:33 am

You can pass module parameters in /etc/modprobe.d

take a look at alsa.conf for example

DooBeDooBeDo · Post by **DooBeDooBeDo** » Wed Feb 05, 2014 3:08 pm

Cool, that's much better

. I didn't like my nasty hack even though it worked.