I recently upgraded from Squeeze to Wheezy and at the sam time I upgraded Trinity. I just realized 
that after this upgrade KPowerSave: 

a) always indicates that the power cord is plug in, even if it's not; 

b) does not show battery level

c) after going into KPowerSave settings display and selecting a power scheme on the first tabs 
display brightness and CPU speed are greyed out and marked as "not supported"

Calling `acpi -b` indicates battery level correctly.

I also notcied that in KControlCenter I can't control brightness in Display settings. OTOH I can 
change display broghtness by using function keys. 

I suspect that I might be missing some packages or that permissions might be incorrect.  Thoughts?

Janek