>  Now, if you do make a gradient from black to white with POV-Ray 3.7,
> the transition doesn't look linear for some reason,

The key point here is "look" linear.  If you did the gradient with 3.7 and 
measured your monitor with a luminance meter you'd find it was a linear 
gradient.  Your eye/brain however doesn't see that as a "linear" gradient. 
(There are various transformations to convert absolute luminance into a 
"perceived" luminance, and they're not linear).

BTW all this (about how your eye/brain works) is completely unrelated to how 
POV should work, POV should attempt to make your monitor display what the 
scene would look like if it existed IRL (just like how a camera works).  In 
this respect if IRL there existed a truly linear gradient from 0% to 100% 
then POV should attempt to make it look the same.  Which it does in 3.7.

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