My battery life is the same or possibly better with Diablo.

Those having trouble, suspect that a program or process is stuck in some loop and eating up processor power and preventing it from going into one of the power save modes.

There are several ways to test for this:

1) Install and observe the status-bar load applet

2) From an X-term shell, run "top" and observe the CPU% of the top few processes
("q" quits "top" other commands can be found on the internet, but note that
this is the stripped down "busybox" version of "top")

3) Install and observe "conky" (a discusion found in the "apps" section of ITT).
The problem with conky is that it uses a little processing power itself so will
drain the battery too, but only while you are running it.

Once the resource hogging process is found, come back with one of those postings that says "Program/Process xxx is hogging up 99% of my processor usage", and we can then work from there.

In the meanwhile, keep doing updates, and perhaps the problem will just go away. My Diablo upgrade was fairly problematic. At several times I had things crashing and locking up in loops until I got most of the 3rd party software installed in a stable working order. I still have a few things not working, but at least now the list is short.