The above post helped me to set backlight dimmer on my Asus EEEPC 1101HA, 
running ubuntu 12.04.
But the commands have to be changed somewhat to actually change the file 
/sys/class/backlight/psb-bl/brightness

2) chmod 666 /sys/class/backlight/psb-bl/brightness
to give yourself permission to read/write (711 actually only gives execute 
permission)

3) Using a text editor (I use vi) gives Fsync errors (/sys is not a normal 
filesystem), so use the shell to write to the "file" instead:
First choose the number, for example 50. The command is:
echo 50  >| /sys/class/backlight/psb-bl/brightness

4) done.

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https://bugs.launchpad.net/bugs/429942

Title:
  ASUS 1101HA brightness hotkeys don't work, generate ACPI errors

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