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Fingerprint scanner - observation.

Rising Star II
When I touch screen to wake just FP indicator icon it shows quickly. But.. when I touch exactly where it is located, the indicator is shown after about 3 seconds.
Maybe random reliability of scanner is still some software issue, maybe related to power management (freezing some important process etc).
Another thing - sometimes FP indicator is grey, another time white. What is the rule? It seems correlated to something unknown. At first I thought about ambient light level, but it is rather random. ???
Anyone with similar experiences?