There's a little bug in power-manager, namely when I use my laptop with very low brightness (lower than the setted-up powersaving level) and the power saving module activetes, it increases the brightness.
I'm using XFCE 4.8.3 on Arch and xfce4-power-manager 1.0.10.
This could be solved with adding a single line like this:
ps: Maybe this is not the best place for this, but I'm new here. ^^"