installing radeon card under debian

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http://unix.stackexchange.com – I have this lenovo z575 with radeon HD 6520G. I have installed Crunchbang Linux and want to configure the video card. I installed open drivers (x-server-xorg...) and nothing. I purged them, installed closed drivers (from the repository), restarted - and still nothing. All the time I run in fallback mode. What is wrong? How to install and configure the driver (HowTos)