at what level modprobe operates ? - linux

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http://serverfault.com – I have a machine with Ubuntu 12.04 64 bit, i have the need for blacklisting a module, i have blacklisted it in blacklist.conf but nothing happened; i have solved my problem passing modprobe.blacklist=<module> as argument to the GRUB command line. My question is: when and how modprobe operates ? it's clear to me that it doesn't really operates 1:1 with the kernel because my kernel still loads even the blacklisted modules, so what is the role of modprobe ? And more than that, on what level, during the boot time, it operates ? (HowTos)