Yeah, sounds like you've been working on this at LEAST as much as I have
lol.  First off, you're definitely using Powermizer, it's built into the
driver.  What it does is adaptively underclock your video card to save
power when on battery.  In our case, it limits the video card's core and
memory clocks to less than half of their potential by force.  If you run
nvidia-settings, you can actually see that your clocks are at 200/100
instead of 799/500 (which is retardedly slow).  You can get a
significant boost of performance if you upgrade from the 185 series of
drivers to the new 190 beta series (which I'm using and have no issues
with).  These have an option to go from 'Adaptive' clocking to 'Maximum
Performance', allowing us 'battery users' to get from 200/100 clocks to
275/301 (Yay, half power!).  Stuff should be smoother for you, at least.

As for an easier way to compile the kernel, under Ubuntu I'd recommend
KernelCheck.  It's a GUI program that will download the latest version
of the kernel, compile it for you, and even let you set the options.
The only thing is that it isn't the default Ubuntu kernel, it's the raw
source.  However, it will also allow you to choose what kernel version
you want to use.  So you can compile, say 2.26.29 or 2.26.30 (or even an
older version of 2.26.31) with ACPI as modular, and still keep the
newest 2.26.31-rc so that Ubuntu won't nag you about it.

The only trouble that this produces is that it isn't compatible with
DKMS, at least not from what I've seen.  So once you install the video
driver in that kernel, you'll need to uninstall either that driver or
the kernel in order to install a newer kernel (which occurs quite often
if you're using Karmic, otherwise it shouldn't be an issue).

Also, I'm shocked to learn that DSDT had nothing to do with it.
Everywhere else I've looked
(http://www.nvnews.net/vbulletin/showthread.php?p=2050621) lists DSDT as
a possible problem, but no one was brave enough to tackle it.  Nice job
on that.  I guess this is just a kernel issue, then.  And only in
certain distributions.  Weird.

If you can't compile the kernel correctly with KernelCheck, I might need
you to post that tutorial.  I've only ever used KernelCheck once before,
and it wasn't really even needed (I set a few options to optimize my CPU
usage, that's about it).

And yeah, the last time I tried openSUSE, the 'One Click' driver install
kept 404ing.  I was hoping I'd have better luck this time, but I think
I'll try your solution first, so long as I know how.

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ac adapter is not detected
https://bugs.launchpad.net/bugs/412499
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