Found another post that handles this problem: 
http://ubuntuforums.org/showthread.php?p=9517612
...and another hint that the bug might be in the kernel: 
/sys/devices/virtual/backlight/acpi_video0/brightness
doesn't set the brightness.

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https://bugs.launchpad.net/bugs/691425

Title:
  Samsung N210i915/Intel N10/:Screen stays black after resume + setting 
brightness won't work

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