Can't think of a proper category for this, so here it is in this group. Running Mint 14 Nadia on a Dell Latitude D820 laptop. Everytime I put the machine to sleep and then wake it up, the screen is on with a strange pattern of colors but nothing intelligible. Sometimes the mouse pointer appears, but is unmovable. I've tried waiting for several minutes to see if anything changes, but nothing happens. I always end up rebooting to clear the problem. Any ideas? Thanks in advance.