Open-source driver for AMD Radeon HD 6490M

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http://askubuntu.com – I have HP ProBook 4530s laptop with AMD Radeon HD 6490M graphics card. After installing Ubuntu it runs on Intel Sandybridge graphics. The Ubuntu community page says: "By default Ubuntu will use the open source ATI or Radeon driver for cards manufactured by AMD/ATI." I already have installed the required driver packages: xserver-xorg-video-ati xserver-xorg-video-radeon xserver-xorg-video-vesa xserver-xorg-video-intel xserver-xorg-video-all, but it uses Intel driver anyway. When I'm uninstalling the Intel driver (xserver-xorg-video-intel) and rebooting, Radeon graphics works, it uses Gallium dri (HowTos)