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I've just bough an Asus laptop which is equipped with two graphics cards; one integrated in the intel i3 CPU and a Radeon Mobility HD5145.
Will Ubuntu switch between the cards to balance power/performance? only use the Radeon when the demands placed on the integrated card are too great? If you look in your /var/log/Xorg.0you can see which driver is loaded (page down a few screenfuls and look for RADEON(0) or intel(0).
Right now you can use the GUI provided by Ubuntu Control Center to switch between GPUs, but it only works with the opensource drivers. The only way I know of to force which card to use is to specify the PCI Bus ID of the graphics card. It's also usually shown near the top of your /var/log/Xorg.0
Then, set up your with a device section and put or whatever bus id you want.
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You don't need to specify the video driver as well (but it can't hurt).
David Airlie has worked on making hybrid graphics work better. for 'linux hybrid graphics' may turn up other useful examples and details about it.