Hi madshi,
I just realize that lav dxva2n decoding does not work with the
old rendering path option.
With geforce driver 306.97 + ION at Win7x64, Chroma Lanczos3, Luma Bilinear scaling does produce different color output from Luma DXVA scaling for 1920x1080 --> 960x540.
See the ribbon's color...
Luma - Bilinear
Luma - DXVA
EVR - DXVA