I just recently installed LMDE (last week) on my Macbook pro as a dual boot with OSX.
It will not suspend or hibernate when I close the lid.
I have checked the power management settings (they are good), and it will suspend if I tell it to from the shutdown menu.
My linux is a bit rusty so I don't know what diagnostics to provide, let me know and i'll be happy to.
Thanks in advance for the help!