Disabling drm/ttm/radeon module loading for debugging

[Pasi Kärkkäinen]

Hello,

How can I make sure drm/radeon/ttm modules are not loaded, 
until I do it manually myself? 

I extracted the initrd image, edited the 'init' script and 
commented out loading of the modules, repacked the initrd, 
and booted but something (plymouth? udev?) still loads the modules..

I'd like to load them later manually, for some debugging purposes..

-- Pasi