Would you mind sharing some information on your setup? What make/model laptop do you have and what distro are you using? Did you have to do anything specific to get the power management to work properly? Cheers
<Shameless Plug> I'm using a System76 laptop (http://www.system76.com/laptops/model/gazelle) and the power management works quite well. The System76 team partnered with Ubuntu to provide enhanced drivers to support all of their hardware with zero configuration to the end-user. I wish the multi-touch hardware was a bit better, but otherwise, I can't say enough good things about my new laptop.