Linux Mint

ATI Driver installation Mint 12
sudo apt-get install build-essential cdbs fakeroot dh-make debhelper debconf libstdc++6 dkms libqtgui4 wget execstack libelfg0 dh-modaliases
 * update your system
 * Disable ATI Driver from "Additional Drivers"
 * Open synaptic package manager, open setting/repositories and select SOURCE CODE
 * search for "kernel" and install (kernel-package,linux-source,linux-headers\linux-headers x64--for x64,(some may already be install)
 * Open terminal and type:
 * reboot
 * Download ATI driver http://support.amd.com/us/gpudownload/linux/Pages/radeon_linux.aspx?type=2.4.1&product=2.4.1.3.42&lang=English
 * Open terminal cd to download directory and type:

sudo sh ati-driver-installer-*.run to make sure its all good in terminal type:
 * install default installation,DONT generate Ubuntu 11.10 package!
 * reboot when done!

fglrxinfo should return something like this:
 * display: :0 screen: 0
 * OpenGL vendor string: Advanced Micro Devices, Inc.
 * OpenGL renderer string: ATI Radeon HD 5700 Series
 * OpenGL version string: 4.1.11251 Compatibility Profile Context