Fortunately there is a Debian way to install video card drivers using packages in the repository. Installing the drivers the Debian way will make sure that the drivers continue to work after kernel updates.
++AtiHowTo++ has instructions on setting up the recommended free and open-source drivers for ATI/AMD video cards.
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You would not let some random stranger feed your baby; do not execute commands without first understanding what they do.
That name is a blast from the past!
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