BT playing music stutter after WM6.5 locked

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I found that when using bluetooth stereo headset(A2DP) to play music, the music always pause within 1 second and continue playing after i lock the phone and turn off the display
When I try to do the same playing with my line earphone, it can playing continuously.
I guess it was caused by the bluetooth driver no compatible with WM6.5.
Any one has the same problem here? the bug is from the first build of WM6.5 till now.


I think I found the root cause:
When I set HKCU/ControlPanel/BackLight/AutoDeviceLockEnable=1, the BT music start to stutter
When I set HKCU/ControlPanel/BackLight/AutoDeviceLockEnable=0, the BT music back to normal.
Any one knows the reason?