Completly disable dedicated ATI card

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http://askubuntu.com – My graphics card is not supporting the official ati drivers, so I am using radeon with switcheroo. Thing is, I don't really need my dedicated card unter linux anyway. So far I have some scripts on startup which should be turning of my dedicated card, but they don't. So I thought to myself: Why try fixing that when there might be a way to completely disable my dedicated card under linux so I don't have to deal with switcheroo anymore. How do I do that? (HowTos)