The Forma does use PWM, and, no, it's not an issue, but let's not go down that road again, please. If you need technical details, the exact frequency used has been confirmed and posted in the Kobo forum.
The Libra probably doesn't, as it's basically a Clara in hiding, and nobody ever complained about that on the Clara (not that anyone actually did with the Forma, despite making a lot of noise about it).
We lack actual developers with PocketBook devices, so, while it could be a great platform for us, it's plagued by a number of weird quirks no-one can really work on.
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