From time to time, the torch of my One Plus One (running Cyanogen) was turning on “by itself”, although the screen was switched off. I finally figured out why and how: it was due to a “Gesture shortcut” that was enabled…
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I never enabled this Gesture feature explicitly, so I presume it was on by default. But when enabled, drawing a V on the screen, even if this one is turned off, switches the torch on (or off is already on)…
This gesture (as well as other gestures) can be disabled via: Settings > Gestures