F11, F12 button not working
slider on the panel is also not working
i hope the dev can look at this matter ASAP.
good luck:pray:
Let's see if/when 3.0.6 is installed it still has the same issues. Maybe direct hardware access does a better job. 
On my old Asus, (running 3.0.6 live) that has a single core Celeron the slider doesn't do anything either but the brightness up/down buttons ( Fn + <- or -> on my machine) do.
too bad, it still.
If the acpi or hardware callbacks doesn't works correctly, you may try to configure (add) the keys from the enlightenment (desktop) settings, to trigger the screen dimming options
If these keys doesn't works, you can in fact just configure any kind of key to trigger these actions 
the command "xev" can help to read the internal events detected by the keyboard, just in case
