Comment 42 for bug 114677

I didn't have a problem with the Fn-F5 and Fn-F6 brightness keys on Feisty or Gutsy but I did after a fresh install of Hardy Heron 8.04. It was fine at first but at some point switching between power and battery caused my screen to go very dark and I couldn't get it back with the usual tricks and discovered the function keys weren't working (adding the LCD Brightness control to the launch panel helped).

I found this thread and checked my system. My system model is daru1 (reported by the System76 Driver Installer). My BIOS version was 302 (reported by BIOS menu F2 at startup). I followed the instructions from the 2007-05-25 Thomas Aaron post earlier in this thread. Worked like a charm. My BIOS is now 305 and the function keys work.

I also went into BIOS and set LCD Power Saving to Disabled since ubuntu can handle that.

Posting this in case other daru1 users encounter this problem after moving to Hardy Heron 8.04. Thanks System76!