modprobe & blacklist

[john f jarvis]

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