Try playing a song using the Music app, press home button to minimise it, and lock the phone. There is no way to wake the phone up anymore. I can feel the phone vibrate as I touch the unlock slider. I am using the sliding tab lockscreen style.
The only way is to remove the memory card so the music stops, only then the lockscreen will appear when waking up.
Edit: I have tested with other music players, and the screen never wakes up when a song is playing. I have already disabled the lock screen music controls in CM settings and also in the music player apps. This problem was never here in the 19th NOV build. I used to be able to pause and skip tracks in my lockscreen itself in the 19th NOV build.
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