I aways had problems with nvidia brightness control, and since 2009 I use the nvidiabl. But there is a issue that brightness sometimes came back to full backlight. So, since the nvidia is with new driver release I'm trying others options and the xbacklight worked very well. But I cant change it with the function keys (nvidiabl can). I can create a shortcut in compiz, but is not the same, I want to "connect" with the default brightness control from ubuntu (with the notification). How I could do that?