1.1 and dualview

I just installed CUDA 1.1 with 169.09 driver. But when it’s used in dualview mode, both side get a low speed as if it’s run on a non-primary screen. Another problem is that if I don’t call glBindBuffer after cudaGLUnregisterBufferObject, it draws nothing. Both problems are fixed if I use only one monitor or switch to horizontal span mode. How’s that happen?

BTW: my GPU is Quadro FX 4600.