Installing ATI-drivers 

http://wiki.grml.org/doku.php?id=ati

The fglrx drivers and the kernel module for 2.6.16-grml (the kernel shipped with grml 0.7) are available through the grml repository, just run 'apt-get update ; apt-get install fglrx-driver fglrx-kernel-2.6.16-grml'. Use 'aticonfig' to generate xorg.conf, for example try to run 'aticonfig —initial'.

Note even though the package name has 'kernel' inside, it won't provide any other kernelversion but just adds an additional kernel module!