MBPro + Cinema Display not going to sleep

Hi everyone,
I have a MBpro 15 (mid 2010) hooked with a 27" Cinema display.
When i use the laptop without the cinema display and i lock the screen, after a few seconds the MBpro goes to sleep (and definitely you save battery power by doing that).
When it is connected to the cinema display and i lock the screen, the MBpro doesn't go to sleep at all and stays on even all night long.
I haven't found any suggestion on how to send the MBpro+cinema display to sleep with a locked screen, can you help?
Thanks for helping

I have the exact same computer as you with the same issue.
Looking for a Guru to help.
Trashing:
Library:Preferences:SystemConfiguration:com.apple.PowerManagement.plist
Doesn’t help.
Any suggestions welcome.
Thanks ... Ken

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