[Q] Nexus S screen locking weirdness

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http://forum.xda-developers.com – Been noticing it on all variants of JB ROM: rasbean jelly, AOSP, OTA. When you lock the screen and expect it to turn off, it goes blank then flashes on just a sec before finally turning off for good. It doesn't matter how you lock it: could be using your power button, screen off and lock app, or the sleep button in notification widgets. Any of you guys experienced this and figured out a way to solve it? (HowTos)