I have a laptop with commutable graphic cards (one ATI Mobile Intel Graphics = low performance, one Radeon HD 6770 M = high performance). When I tried to run Blender on the Radeon chipset, it crashes at start. When I try to run Blender on the Intel chipset, it runs, but slowly.
I have tried with 2.79b and 2.78c Blender version but got the same problem.
Thanks for any advice.