@ZodWallop: IIRC, it's only implemented properly on Zelda devices (i.e., the Oasis 2 & 3), so, not quite the full current lineup

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And, yeah, AFAICT, the waveform and processing code is mostly designed by eInk (not Kobo, and not even their OEM), so that's not something that can just pop up out of nowhere

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(But, yeah, the implementation is similar, except that the Kindles do some extra trickery to the frontlight level to alleviate the flashing issues even more).