Ok, I found how the brightness can be adjusted by editing a text file:
1) Open a terminal and type sudo su to get root permissions
2) chmod 711 /sys/class/backlight/psb-bl/brightness   to give permission to 
yourself to read/write the text file in question.
3)Use a text editor to open the text file, in the example it's leafpad:  
leafpad /sys/class/backlight/psb-bl/brightness
4) Choose a number from 1 - 100. You 'll probably want to set it somewhere 
inbetween (around 50 is ok). Save and you're 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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