Comment 40 for bug 1088146

That's interesting. I only tried to boot and reboot the 64 bit version of that Live CD, and it seems to work.
But what is even more interesting is that this is the first time I've got the system to report back energy_full_design.

I can try and load a newer kernel onto my Mint install and see if that works. I'm kinda a newbie at this, so don't expect miracles.

But as you said, this is most likely not related to upower.