After an extended period of inactivity - say a couple of hours - I find that my MDK9.1 setup won't wake up. I have a black screen with white cursor, but I can't get back to the desktop. Hitting the "Wake" key, which does the trick with the same PC when running Windo$e, doesn't do anything in Linux. I have to resort to bringing up a command line prompt using Ctrl+Alt+F1, login as root, and shutdown -r now.
Any suggestions how I can get this slumbering giant to wake up normally