Light notification

I'm pretty sure that you can't. There are some apps in the Play Store that do that, but the M9 isn't supported as far as I know.
 
This is another issue I was hoping HTC would address. I loved the way the indicator light on my S4 would use a particular color, depending on whether it was an SMS, an e-mail or a Facebook message. But beyond the color issue, the Galaxy line uses a nice, bright, constantly on indicator. With my M8, it's one color, very faint, and it only blinks every couple of seconds. It may sound silly, but I find it annoying having to stare at my phone for a couple of seconds, for it to indicate if I have a message waiting. Like I said, it's not a deal breaker item, but it's one of those usability factors you would hope companies would address in updated revisions.
 

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