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When will the opengl performance issues of the HD4000 driver be fixed? I have a graphics application that runs at about 20 fps on sandy bridge core i7 laptop (HD 3000). On a similarly configured ivy bridge laptop, it drops to about 1 fps.
The problem appears to be related to the depth buffer. When the depth buffer is turned off performance is quite acceptable although the accuracy of the generated image is not acceptable without the depth testing. When the depth buffer is turned back on, the performance suffers.
Again, on an HD3000 laptop performance without a dedicated GPU is quite acceptable. Why can't the HD 4000 driver perform at least as well as the HD 3000?