I installed CentOS 6.3 on a Dell Inspiron laptop which is about 2.5 years old. Things mostly work, except for Power Suspends. When I click 'Suspend' from the 'Shut Down' Menu, the laptop seems to suspend okay, but then I can't un-suspend. I tried pressing the power button, or moving the mouse, but nothing happened. I eventually held the power button long enough for it to reboot. Am I doing something wrong? How can I get the laptop to wakeup after the suspend?