[Q] How can I use Headphone Button commands on XT910 with ICS when screen is off?

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http://forum.xda-developers.com – Hi guys, I have a Razr Maxx XT910 with a stock ICS 4.0.4 (672-180-340 latam) and i can't use headphone button`s command when the phone is on sleep mode (locker or not... but screen off) . I 've tried many music players with Headphone commands, like Winamp, PowerAmp, the stock player itself, Google Music, XPlay, Mixzing and also some Headphone controllers apps like Kiplish, Jays, Headphone Button Controller... The commands only works when the screen is on... even when the phone is blocked... I tried not use the screenlock widget when possible and even dont lock the phone, like some blo (HowTos)