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Does undervolting really save battery life?

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TiTAN-O-One
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Default Does undervolting really save battery life?

Hey guys i saw this video on youtube (http://youtu.be/5nrOWZUsEEc) that explains that undervolting wont make your phone save battery life more than 2% even with EXUV. I need explanations for this as i don't really understand.

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ilusi0n_
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Originally Posted by TiTAN-O-One View Post
Hey guys i saw this video on youtube (http://youtu.be/5nrOWZUsEEc) that explains that undervolting wont make your phone save battery life more than 2% even with EXUV. I need explanations for this as i don't really understand.

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What part of "you won't save more than 2%" you didn't understand?
 
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Originally Posted by ilusi0n_ View Post
What part of "you won't save more than 2%" you didn't understand?
Well, i don't really understand WHY it doesn't save more than 2% of the battery life. Afaik, EXUV does reduce heat and improve battery life by miles. But that's what I thought. In reality which is this, im not rly sure why that even with EXUV, it still cant save more than 2% of the battery life.

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dec0der
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Originally Posted by TiTAN-O-One View Post
Hey guys i saw this video on youtube (http://youtu.be/5nrOWZUsEEc) that explains that undervolting wont make your phone save battery life more than 2% even with EXUV. I need explanations for this as i don't really understand.

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I'm not technically expert with things like this but I have read an article/ blog before that undervolting may damage a phone since it was designed to work with that specific voltage. So, I actually didn't do that even UC or OC. Just saying..... :P
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r25txe
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Undervolting doesn't save battery as your CPU will still try and draw the manufacturer set levels.

If it doesn't get those levels it must step down its own level which essentially means that the activity that needs processing needs more time, and consequently, more battery.

Even if you manually adjust the clock speed of your CPU down to match your new voltages, the same applies.

UC/UV is quite simply the worst voodoo that persists across these forums.

/stripped down explanation

(I didn't even watch the video)
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Originally Posted by r25txe View Post
Undervolting doesn't save battery as your CPU will still try and draw the manufacturer set levels.

If it doesn't get those levels it must step down its own level which essentially means that the activity that needs processing needs more time, and consequently, more battery.

Even if you manually adjust the clock speed of your CPU down to match your new voltages, the same applies.

UC/UV is quite simply the worst voodoo that persists across these forums.

/stripped down explanation

(I didn't even watch the video)
we can control the hardware through software so we can control the voltages and frequencies through kernel

devs can put new frequency levels as manufacturers did (like this :https://github.com/Christopher83/sam...121c3a1915dd68)

if its not true and if this method doesnt work, Why all kernel devs on XDA trying the same thing??

https://github.com/faux123/android_k...8994d41e5d20d8

https://github.com/franciscofranco/h...801cc568d231ad

in summary EXUV and UV are absolutly battery-friendly

and do not forget undervoltage cant damage the hardware but overvoltage(ı mean OC) can damage the hardware
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r25txe
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Originally Posted by sir mordred View Post
we can control the hardware through software so we can control the voltages and frequencies through kernel

devs can put new frequency levels as manufacturers did (like this :https://github.com/Christopher83/sam...121c3a1915dd68)

if its not true and if this method doesnt work, Why all kernel devs on XDA trying the same thing??

https://github.com/faux123/android_k...8994d41e5d20d8

https://github.com/franciscofranco/h...801cc568d231ad

in summary EXUV and UV are absolutly battery-friendly

and do not forget undervoltage cant damage the hardware but overvoltage(ı mean OC) can damage the hardware
I've based my reply above on this post.

It is a much longer version of what I summarised earlier.

And, sorry, even UC/UV can damage your hardware in rare situations.

It does baffle me why people spend so much time tweaking things as you mention when the net returns are negligible, and often cancelled out.
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TiTAN-O-One
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So to sum all this up. We just have to leave the CPU & voltage tables alone since it damages hardware?

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r25txe
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It's not that you have to, but that chip designer recommends it.
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dec0der
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Originally Posted by r25txe View Post
I've based my reply above on this post.

It is a much longer version of what I summarised earlier.

And, sorry, even UC/UV can damage your hardware in rare situations.

It does baffle me why people spend so much time tweaking things as you mention when the net returns are negligible, and often cancelled out.
That was also the POST that I'm referring to that I've read
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