Comment 104 for bug 257827

(In reply to comment #2)
> Very bad, HAL had an info about that, it seems now there is no easy way of
> doing it, unless i export the HAL code that does that to xfpm... i think it is
> the only one solution available.

Hmhm, do you know how gnome-power-manager does it? That's something worth adding to upower anyway.