I thought I chime in with some more goodies thats making my experience
on Jaunty a whole lot better when it comes to this stuff. The
application "powerdevil" just didn't want to work for me out of the box.
I did manage to get it working (somewhat) by installing "cpufrequtils".
This definitely got "When the system is idle for more than [N]"  working
but everything else just felt broken. The power/sleep buttons do nothing
(absolutely nothing, system shuts down instead), I didn't see my
displays exhibit power management, etc *but* thats fine.

What I was after was this behavior. 1. press the power button and
"suspend to ram". 2. wake up to a locked screen. No matter though,
powerdevil wouldn't get the lock screen right until I installed
"cpufrequtils". Then I had to do one more thing. a big temporary hack I
hope *but* I copied /etc/acpi/powerbtn.sh to
/etc/acpi/powerbtn.sh__backup and replaced the contents of the original
file with the following.

#!/bin/sh
# no logic, just hope to lockup and suspend. KDE4.2
qdbus org.freedesktop.ScreenSaver /ScreenSaver Lock
pm-suspend

Well, now, the powerbutton on the box when tapped, locks up and suspends
just fine. When I resume, I come back to a locked screen.I would really
like to start removing these hacks though and just see Kubuntu work
pretty much out of the box. Can someone offer some better solutions? I
would appreciate it!

Thanks!

PS. selecting suspend to ram from kickoff still wakes up without a
prompt for a password. Although I may not be using powerdevil directly
to suspend using either method, it will suspend after X amount of time
and will resume with the screen locked but thats about it with
powerdevil :/

-- 
[MSI MS-7374] suspend/resume failure [non-free: nvidia]
https://bugs.launchpad.net/bugs/334644
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