ok guys, the m6
DOES have an auto-rotation function for photos. You just go to Photos > Slide Show Settings > Auto Rotate (On or Off).
let's differentiate aspect ratio with orientation.
so let's say you have 2 photos, one is 320 wide by 240 tall (landscape) and the other is 240 wide by 320 tall (portrait). if you've turned on the auto rotate function, then the m6 will detect the
orientation of your pictures and output them properly on the screen.
what the m6 won't do is stretch the pic for you if it's not exactly 320x240 or 240x320. so here we're talking about the
aspect ratio. so if your pic is 300x250, black bands will appear in the sides so that you'll be able to see the whole picture.
hope this has somehow helped make things clear.