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Any idea whats the difference between the 2 types of signal icons?

Usually I get the style on the top, but sometimes I see the one on the bottom. Have no clue what triggers one type instead of another

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It's hard to tell from your images. Could the bottom one represent a peak connection strength that has fallen back down? – Brad Patton May 3 '13 at 17:34
@BradPatton I'll keep an eye on the pattern. But, 2,4,5 bars of signal shows the normal icon. 3 bars shows this one. (Was hoping this is in some document somewhere!) – Akash May 3 '13 at 17:57

Disable your alternate wireless connections which are not active under the adapter settings. (i.e. bluetooth or other wireless connections which you are not using). I am not sure what the grey is supposed to indicate, but this alleviated the problem for me.

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