This has been my BIGGEST problem with the newer kernels. There has been a bug with the Intel Arrandale chipsets, which are causing suspend/resume to break. The problems include blank screen on resume, computer not booting up, etc. I have a Core I7 Latitude E6410 and I was simply being screwed because of the suspend issue.
When you suspend and resume, your screen would be dim - this is because the LCD backlighting is still switched off (unresolved issue). To turn it back on, press Fn+Left-Arrow.
NOTE: An additional clarification - after resume, if you try to use VLC, the machine crashes with GPU errors. This is easily solved by turning off GPU acceleration in VLC.