It's reported at https://code.google.com/p/android/issues/detail?id=161613
This affects both the old and new Camera APIs - both of these now report 0 for min and max exposure (i.e., not supported). This definitely worked with Android 5 on the Nexus 6.
seems they have replied that there are bugs they are fixing but unfortunately there have not been a fix. It is indeed super annoying and Android team is just disappointing with all these Lollipop bugs
And not only with users. This bug affects the APIs so every developer can't use ea compensation! Great apps as manual camera and fv5 now don't worth the money on n6. I'm really disappointed too!
It is actually a Nexus 6 only issue on Android 5.1