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In ubuntu11.10 , I still need to use open source drive of ATI when using Switcheroo ? The 'addon driver' in system menu is about open drive or propriety driver ? Thanks

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Switcheroo works for open-source drivers only (radeon, i915, nouveau). The Additional drivers program tries to install proprietary drivers which do not work with switcheroo.

See also:

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In ubuntu 11.10, how to install open source drive of ati Radeon HD 3650? thanks –  waterloo2005 Jan 27 '12 at 17:44
    
Uninstall the fglrx driver (and possibly reboot). The radeon driver should be installed by default. –  Lekensteyn Jan 27 '12 at 18:23

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