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Re:Show HN: Paperd.ink – Open-source e-paper development board by crypt0x on Sunday May 30, 2021 @10:03AM (#27333328)
Not an export on this but I heard what blocked a lot of projects based on kindles was the proprietary waveform driver stuff to draw on the displays. Meaning that basic linux had supper inefficient redraw behavior compared to what the eBooks are doing.

What’s the situation here?

Re:Show HN: Paperd.ink – Open-source e-paper development board by robertlangdon on Sunday May 30, 2021 @10:49AM (#27333637)
No idea. We're not using the Kindle displays so we aren't affected by any proprietary waveforms.