I have a Dell Latitude laptop, working fine for a long time. However, I recently updated to 13.04, and now my computer fails to suspend, no matter what. Closing the lid doesn't work, clicking suspend from the system menu doesn't work, and sudo pm-suspend doesn't work. When I try suspend or closing the lid, my screen shuts off and it password locks my computer, but the computer is still clearly working, fan and power light on (normally when suspending the fan would shut off and the power light would do a slow flash.) A simple key press or swipe on the mouse pad will turn the screen back on. When I try pm-suspend, I get a black screen showing a blinking underscore for about 20 seconds, then my computer will return to the state it was and the terminal command will end. I need to be able to suspend, my computer travels and needs to be able to go a few days without power. Any suggestions, please let me know.