On Acer Aspire 5920G after updating kernel 3.2.0-40 12.04 LTS Ubuntu-Studio I 
got the same problem and it still resists with the kernel -41.
Before I made this update I had no problems with xfce-power-manager.
I tried to solve it with this workaround, which doesn't solve the problem 
completely:
http://d24m.de/2012/05/10/xubuntu-12-04-und-der-power-manager/
The power manager doesn't start automatically after processing this workaround, 
but I can start it now with a terminal or over Software=>Accessories=> 
Power-manager=>"will you start the power-manager", without the reported error 
message. The brightness control doesn't work as it should: no OSD is shown and 
there are no limits to the brightness regulation. Having the cairo dock 
installed it shows me, that it changes the gamma, too,  if I change the 
brightness. This is a new behavior! I have version 1.0.11-0ubuntu2 installed.

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https://bugs.launchpad.net/bugs/973778

Title:
  Unable to connect to Xfce Power Manager

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