For my camera the Adobe Standard profile and its tone curve produce linear results with PV2010 when the basic controls are zeroed and the point curve is set to linear as shown below. The departure from linearity in the deep shadows is likely due to flare light.
That's a quite perfect result, Bill.
Out of interest, does the Adobe Standard profile for your camera show any difference between Tone Curve = Base Profile vs. Camera Raw Default in the DNG Profile Editor ?
In my experience it is very difficult to produce linear results with PV2012, consistent with Bart's observations. Have you succeeded?
For my qualitative purposes, and also in view of the close match seen with the graph in your previous post # 22, I’d say that the linear results with PV 2012 are reasonably okay. We could argue that an (auto-)black-point setting does not per se break linearity in the sense of y= ax + b (although the new implementation of Blacks may have overcome such simple math), and further that the auto-highlight recovery feature seems to act quite gentle, and is virtually without effect with a properly exposed image. Just as you stated "The results are nearly the same except for some divergence in the highlights and a bit greater divergence in the shadows".