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How to configure FOSS ATI drivers on Debian Wheezy and ATI RS880 [Radeon HD 4250]?

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http://unix.stackexchange.com – Installed a fresh Debian Wheezy to enjoy Gnome 3 but it starts in fallback mode. I suppose that's because the loaded drivers do not support 3D acceleration. Installed packages I know are relevant: xserver-xorg-video-ati libgl1-mesa-dri The Gnome 3 was working fine with Ubuntu 12.04, and I belive it was using the FOSS drivers. Interestingly there is no /etc/X11/xorg.conf and when I try to generate it with Xorg -configure I get: X.Org X Server 1.12.1 Release Date: 2012-04-13 X Protocol Version 11, Revision 0 Build Operating System: Linux 3.2.0-2-amd64 x86_64 Debian Current Operating Syste (HowTos)