Oops, fixed the patch above
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On that note, the sunxi devices (e.g., your Sage) do not support linuxfb hardware rotation at all, so they behave entirely differently (i.e., rotation is handled by the driver at blit-time). FBInk hides the mess away by returning potentially sensible rotate constants, but it's entirely fake ^^.
That also means things gets wonky if FBInk is not the one that triggered the rotation, because the only thing we can do is query the accelerometer... and that can be finicky as hell
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