modprobe & blacklist

Todd Denniston Todd.Denniston at
Tue Jul 15 14:29:04 UTC 2008

john f jarvis wrote, On 07/15/2008 08:44 AM:
> On Mon, 2008-07-14 at 23:05 -0700, Tod Merley wrote:
>> On Mon, Jul 14, 2008 at 5:32 AM, john f jarvis <johnfjarvis at> wrote:
>>> To use gpsbabel with my Garmin Venture Hc gps receiver I must
>>> first remove the FC9 builtin garmin_gps usb module.
>>> As su this works: /sbin/rmmod garmin_gps
>>> My question: How can I use the blacklist feature of modprobe
>>> to do this automatically? Adding the line: blacklist garmin_gps
>>> to /etc/modprobe.d/blacklist and/or modprobe.conf.dist
>>> doesn't work.
>>>        Thanks, John Jarvis
>>> --
>> Hi John Jarvis!
>> I would look carefully at the output of lsmod before and after the use
>> of rmmod.  Likey there is another "companion" module you need to
>> blacklist to make this work.  To make one of my wireless modems work
>> for example I neede to blacklist oronco and oronco_cs to get the job
>> done.
>> Good Hunting!
>> Tod
> Thank you Tod:
> lsmod does show two modules are loaded: garmin_gps, usbserial
> Adding both of them to /etc/modprobe.d/blacklist doesn't prevent
> loading them when the GPS receiver is connected. Where do hotplug
> scripts live?
> 	John

are you booting with the garmin plugged in?

I found (over the years) that if you want things in /etc/mod* to take effect 
at boot, you need to rebuild the initrd after making the mod.

An alternative, for testing purposes, is just rm/mv the module for now.

Todd Denniston
Crane Division, Naval Surface Warfare Center (NSWC Crane)
Harnessing the Power of Technology for the Warfighter

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