Comment 45 for bug 423694

to update gnome-power-manager on my 9.10 system :

I downloaded gnome-power-manager 2.30 from here
http://linux.softpedia.com/get/Desktop-Environment/Tools/GNOME-Power-Manager-3684.shtml

unpacked the tar- sudo tar xvf gnome...tar.gz

after installing dependencies one at a time (ouch)

sudo ./configure
sudo make
sudo make install

on restart, there is no more flickering :)

I don't know if this is the best way to solve this, but it seems to be good for me