Not sure if you are experiencing the "backlight error" for Cacko 1.23. I know you are not using cacko, but for cacko, when the backlight is set to the first or second mark and the unit suspended, on resume, the screen will be blank.
However, I think a reset should resolve that ... so I am not sure whether yours falls into this error.
Maybe you can try the backlight setting and see if you can repro the results.
And btw, to resolve it, should you encounter the same symptom, you can try the "increase backlight" fn-4 keystroke.