Well, there is this, still waiting for an answer:
http://phoronix.com/forums/showthrea...536#post298536
This is about my tries with the open source driver:
http://phoronix.com/forums/showthrea...a-Clevo-P170EM
Apparently PRIME doesn't work with xorg 1.13 because it needs X acceleration, southern islands has only glamor acceleration and glamor is not on xorg 1.13 yet.
There is a bumblebee branch for radeon cards but it doesn't seem to work well yet:
https://github.com/Bumblebee-Project...ebee/issues/52


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