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WeeSin: The solution is very simple. Get to know what exposure combinations you can use with the M9 in direct sunlight without blowing highlights and simply use the camera in manual exposure mode. In post, lift the shadows to taste. There is not much need for auto exposure in such situations as it will tend to overexpose for the shadows and sacrifice highlights. Also, if the light is constant/consistent, once you know the correct exposure, there is no need to change it. Auto exposure will constantly fluctuate exposure based on the reflective value of the scene even though the light intensity remains constant, which can result in more work later in post trying to equalize the changes from image to image.
I think it's been pretty well documented in this thread and elsewhere that one should avoid blowing highlights with the M9. While I've found I can pull them back somewhat in LR, avoiding clipping and brightening mid tones and shadows in post seems to work better for me. A compounding issue while shooting is that the M9's LCD is quite a poor indicator of image tonality. It has a tendency to appear very high contrast with blocked up shadows, which encourages setting brighter exposure settings, when in actuality the darker images retain a good amount of recoverable tonality. It might also help to turn on the highlight clipping feature. At least compared to the Canon cameras I use, it works when zoomed in on details, so you can at least get a pretty good sense of how close small, but possibly important, highlight regions are to clipping.