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so what's wrong?
maybe i got wrong drivers?
is there any compatible driver for this video card?
TeraScale-based GPU (like yours) support is dropped in proprietary fglrx driver since Crimson release. AMD continue to support TeraScale architecture in free radeon driver. Unfortunately, I think radeon driver and Mesa is quite old in Jessie. Something like Ubuntu/Kubuntu/Xubuntu/etc. Wily would perform better. For launching application on dGPU with free driver run something like: DRI_PRIME=1 steam