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It's probably handled via awesome's ligl stuff, which is... not for the faint of heart.
Also, probably minified/obfuscated on production builds, so, might have to dig in a recent-enough factory image.
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For custom content, fbink -H -s will do the job, on a per-refresh basis. (Depending on what's on screen and whether you want a flash, you'll also want to manually select one of the three dedicated nightmode waveform modes).
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