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* Only toggle nightmode via the grayscale fb info flag on Kindle Most NTX boards require elaborate trickery (see fbdepth) to actually send a vput ioctl without the driver screwing with the rotation behind your back. This was causing spurious hardware rotations on exit on most Kobo devices, something which might have gone mostly unnoticed, as current Nickel versions will sanitize it on startup. A simple repro was instead to start an USBMS session, as that exits KOReader and restarts it without going through fbdepth again ;).