How to enable double tap to wake xperia m on sxdnickilolly kernel

I'm using sxdnickylolly kernel on cm 12.1 on my xperia m and one of the features are double trap to wake which isn't working by default. Anyone knows how to enable it??!

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Hand gasture to wake ambient screen (

Hi has anybody found an app, xposed module or a zip file that adds this feature? All I have been able to finds is ones that wake the entire screen.