Only pm-utils does power savings. And so does lmt. Others are reporting tools or tools that can trigger.
Quoting Ritesh Raj Sarraf (firstname.lastname@example.org):
> Package: tasksel
> Version: 3.07
> Severity: wishlist
> laptop-mode-tools is a power saving tool for linux. It would be good to
> see laptop-mode-tools installed when a user selects the "Laptop" task.
How does it differ from the following list?