[Verizon Samsung Galaxy S III] Nazo:
I wanted to undervolt my CPU a bit to hopefully get a better battery life. Especially now that I've gotten a tablet (Nexus 7, so nothing to sneeze at) I'm using my phone as a Android device a little less and most of my gaming on it allows for some very low CPU speeds anyway. So to that end, if I can squeeze a little more out of it, it seems like a good idea. I've already taken a LOT of other steps, including minimizing the number of things running all the time (it's actually a little annoying how often things stay running in the background that I just don't need, so Android Assistant is now one of my favorite tools, though I wish its "quick boost" widget and the automatic selections in the process list could stop more apps) and I've even removed a lot of the built in things that run all the time that I don't want like live wallpapers (I really don't understand why it likes to run even if you're not actually using a live wallpaper) and DSP Manager (I want the sound to be unmodifed anyway) among many others. I use SetCPU to set the CPU lower under normal operation with the conservative governor and to even set it extremely low when the screen is off with the powersave governor. WiFi and mobile data stay off when I'm at work and often even at home. Overall battery life is generally quite good, but sometimes it's still going down faster than it really should even just idle with the screen off. If I could just squeeze a little bit more out of it I'd be a lot happier. Plus it also can get fairly hot despite the underclocking on those occasions I do play a game thanks in no small part to the fact that I'm having to use an Otterbox on it (which means not one, not two, but THREE layers of insulation on the back side when Samsung pretty much designed it with one in mind. More heat escapes through the glass at the front than the rear and that's saying something given that glass is a pretty strong insulator... Otterbox truly needs to design these with some sort of thermally conductive material or something.) I don't know that undervolting would help a lot with either since I probably can't go down by much, but it most certainly can't hurt...

Ok, so I grabbed the KT747 kernel for the Verizon SGS3 from here (I got the AOSP Jellybean version, not Touchwiz) and tried to install it using the update function in ClockworkMod then cleared the cache partition and Dalvik cache both immediately after. The moment I hit reboot, the phone got stuck on a black screen or shut off (I couldn't exactly tell which.) I didn't find a convenient CM10 kernel alone, so had to basically just put the full CM10 update which of course was a bit inconvenient since I had to redo a lot of stuff. Is that the incorrect way to install it? So far everywhere I've looked everyone just skips over the part about the actual install process -- they just say to install it. Given that it's distributed as a ZIP complete with the normal stuff one would see in a recovery update ZIP I assumed that was the appropriate way (and it did say it was successful and all.) Well, I've read in that thread and others that sometimes it just doesn't work with some phones, so my assumption is that was the case here, but just in case if I've installed it wrong it would help to try doing it right, lol.

Is there any other kernel I should try with CM10? I don't need any special features (definitely no Voodoo sound or whatever -- again, I like the sound being unmodified anyway) beyond the normal stuff other than the ability to undervolt the CPU by a bit. I'd like to do the undervolting with SetCPU if I could as it overall suits me best of the tools I've tried and even has a "safe mode" ZIP file that can be installed as if it were an update in the recovery menu that would stop it from doing its thing if something goes wrong, thus making it safe even to use the set on boot option (though I suspect that with my current underclocking the CPU will remain stable until I push it at any reasonable undervolt level.) Or am I maybe even missing something and CM10 actually has the ability built in that I just haven't found anywhere? I see options to set the CPU min/max, governor and I/O, but nothing about things like voltage (or overclocking for that matter, where I assume such settings would probably lie.) From my understanding, the fact that SetCPU lacks even a tab for voltage control on here means that it thinks the kernel doesn't support it though.

EDIT: Oops, forgot to mention, but I did do "fix permissions" after clearing both types of cache. Also, the system is definitely on when it just goes black. When I press the power button I get the power LED on green indicating that the battery is nearly full and the hardware button backlights come on.