Can undervolted kernels silently corrupt all the data on your phone? Is there a way to run stability tests to make sure your CPU can run with the lower voltage?
I'm running Lou's #8 and just want to make sure it's not damaging my phone
Lou's kernels aren't undervolted.
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Skrillex1 said:
Lou's kernels aren't undervolted.
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Oh, well then I guess I don't understand what his kernels do if they aren't undervolted or overclocked, what is it helping???
In terms of speed...they're stock...you can check his kernel thread for what each supports and doesn't support and a more detailed description of what they do. They do give decent battery life though which equals ++++++
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Undervolting won't harm the phone physically, but it can make the phone more unstable, which could lead to data loss/corruption. Especially if you try to tax it too hard. If you notice your phone starting to hang up or restart a bit excessive could mean the undervolting was a little too extreme.
As stated in post 5, no not physically. Most undervolted kernels are based on clock speed, so it's more like scaling the voltage. The idea is, "Why feed it more than it needs? It's just a waste". On that note, I have never seen an issue with it on any kernel I have ever tried. Hope that helps!
Related
I'm using XDA app and been searching forums on what kernals do, I'm running cm7 latest nighty with tiamat latest version. Not sure what all the features are , I know it does overclocking and under and voltage adjustments, just wondering if it was worth going to tiamat from cm7 kernal and if it gives better performance and better battery? Thanks
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fierceeagle2003 said:
I'm using XDA app and been searching forums on what kernals do, I'm running cm7 latest nighty with tiamat latest version. Not sure what all the features are , I know it does overclocking and under and voltage adjustments, just wondering if it was worth going to tiamat from cm7 kernal and if it gives better performance and better battery? Thanks
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Different kernels work better for different phones... give them a try (give it a few days) and see which works best for you! Like you said, undervolting, under/overclock, BFS, HAVS, CFS, all features to increase battery life and/or performance!
Thanks for reply
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The kernel is the part of the operating system that is in direct control of the hardware, its the lowest level of the OS. It controls the frequency the CPU runs at, how much power to pull from the battery, how to schedule I/O, how many frames per second animations run at, and things of that nature.
In my opinion, rooting is almost useless without flashing a custom kernel. Thats really the only way to increase the performance of your phone.
cobirch2 said:
The kernel is the part of the operating system that is in direct control of the hardware, its the lowest level of the OS. It controls the frequency the CPU runs at, how much power to pull from the battery, how to schedule I/O, how many frames per second animations run at, and things of that nature.
In my opinion, rooting is almost useless without flashing a custom kernel. Thats really the only way to increase the performance of your phone.
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Thanks..
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Which one do you think provides the best battery life and performance?
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jbadboy2007 said:
Which one do you think provides the best battery life and performance?
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The one that shuts your phone completely off...LOL.
All kidding aside, the only thing I have seen actually provide better battery life with these is to lower the max speed. Even the author of SetCPU says you can have performance or better battery life, not both. I believe SetCPU provides more options for profiles whereas Voltage control lets you play with voltages which of course is very dangerous for stability. There are so many options in both that it will be hard to get a definitive answer and since every phone is different, Your Mileage May Vary.
kennyglass123 said:
The one that shuts your phone completely off...LOL.
All kidding aside, the only thing I have seen actually provide better battery life with these is to lower the max speed. Even the author of SetCPU says you can have performance or better battery life, not both. I believe SetCPU provides more options for profiles whereas Voltage control lets you play with voltages which of course is very dangerous for stability. There are so many options in both that it will be hard to get a definitive answer and since every phone is different, Your Mileage May Vary.
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With voltage control (and now setcpu), you can undervolt and overclock which could theoretically give you performance and speed. I'm a setcpu supporter, btw.
Tegrak. 'nuff said
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kennyglass123 said:
The one that shuts your phone completely off...LOL.
All kidding aside, the only thing I have seen actually provide better battery life with these is to lower the max speed. Even the author of SetCPU says you can have performance or better battery life, not both. I believe SetCPU provides more options for profiles whereas Voltage control lets you play with voltages which of course is very dangerous for stability. There are so many options in both that it will be hard to get a definitive answer and since every phone is different, Your Mileage May Vary.
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Very well put,,
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I like SetCPU myself , but mainly because my phone doesn't do well with undervolting
Did setcpu in the past dropped for tegrak.....way better!
rootxda said:
Did setcpu in the past dropped for tegrak.....way better!
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I'm undervolting with tegrak right now because I can't with setcpu. Definitely worth the money
It also depends what you are running. Voltage Control won't work with Gingerbread leaks and Tegrak with SetCPU is working nicely to prevent the random reboots in the leaks.
xopher.hunter said:
Tegrak. 'nuff said
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Same here...
I used Voltage Control on my phone and SetCPU on my tab.
I support setcpu, i use it well, as u concerned thd battery life, so lower the max frequency, hope to help u!
Sent from my HTC Desire S
just a little information/ competition to see which SGS2 is the best , i want to see how low of a voltage you can go. I am using Stability test to test out the voltage, 3 round of classic test at 1.73ghz at 1125mV, and it stable, a little scare to go down more but here some info on my SGS2
running
beastmod 4.2
kernel 2.3.6
Was running originally at 1175 but i undervolt to 1125 and running stable at a stable temp of 41-42..
what's yours
be careful with such drastic undervolting at those frequencies, could result in corrupt nand.
G1_enthusiast said:
just a little information/ competition to see which SGS2 is the best , i want to see how low of a voltage you can go. I am using Stability test to test out the voltage, 3 round of classic test at 1.73ghz at 1125mhz, and it stable, a little scare to go down more but here some info on my SGS2
running
beastmod 4.2
kernel 2.3.6
Was running originally at 1175 but i undervolt to 1125 and running stable at a stable temp of 41-42..
what's yours
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This isn't undrevolting..... this is underclocking.
Undervolting is pretty dangerous with trial and error. The lowest I'll go is -75.
And my frequencies at min 384 and mas 1350 ondemand
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xxKamikazexx said:
This isn't undrevolting..... this is underclocking.
Undervolting is pretty dangerous with trial and error. The lowest I'll go is -75.
And my frequencies at min 384 and mas 1350 ondemand
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no underclocking meaning i would use less ghz than the stock, this is minimizing the voltage on the core.
what your doing is underclock, i put mine fixed on 1.73ghz at 1125mV of voltage
icenight89 said:
be careful with such drastic undervolting at those frequencies, could result in corrupt nand.
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I have never heard of such thing, i'm not doubting you but from over the years, i heard undervolting have positive affect on the CPU by lowering temp and give battery more juice.
where did you get those facts from?
G1_enthusiast said:
no underclocking meaning i would use less ghz than the stock, this is minimizing the voltage on the core.
what your doing is underclock, i put mine fixed on 1.73ghz at 1125mV of voltage
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Ohhhh my mistake, I didn't catch the mv after the 1125 lol that's why I thought you were only messing with ghz ha ha ha
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xxKamikazexx said:
This isn't undrevolting..... this is underclocking.
Undervolting is pretty dangerous with trial and error. The lowest I'll go is -75.
And my frequencies at min 384 and mas 1350 ondemand
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As far as I know, there are no dangers associated with undervolting. I run at those frequencies too at -112.5 and have never had a problem of any sort.
I run about 1ghz. No under volt with this ics kernel but with my old gb kernel I undervilted with faux -100 at 1ghz...ran cool even with games and video, great battery life. And honestly 1ghz is plenty for snappy fast speed
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i also run 1ghz, runs super smooth across the board
zander21510 said:
I run about 1ghz. No under volt with this ics kernel but with my old gb kernel I undervilted with faux -100 at 1ghz...ran cool even with games and video, great battery life. And honestly 1ghz is plenty for snappy fast speed
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How did you undervolt by -100?
yoft1 said:
As far as I know, there are no dangers associated with undervolting. I run at those frequencies too at -112.5 and have never had a problem of any sort.
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I don't know if you're familiar with overclocking, but the same type of stability issues can occur. When you're undervolting you can think of your stock speed as an "overclock" and you're just trying to minimize the voltage necessary for stability. If you undervolt too much you can experience freezing, corruption, bad lag, etc. It's all the same process for desktop computers, laptops, and anything else you can play with the voltage.
Personally I'm at -62.5, but after seeing how low people are going I might be a bit more adventurous. Don't use the "Set at Boot" option when you're experimenting.
SupaKid said:
How did you undervolt by -100?
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I did it gradually...and the fact that I was at 1ghz might have also made it possible. Started at -50 since most had said it was safe...then tried 60 then 75 then 90 then maxed at 100...worked beautifully.
I have heard and it is true that phones are made very different. Some exact same models can't oc or UV as high or low as others...I got lucky with a really good model...my old nexus S couldn't oc to 1.4 without freezing while others could.
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Nice!
Could I try your script?
SupaKid said:
Nice!
Could I try your script?
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My bet is he used romanbb's FauxClock (which maxes out at -100mv).
What's the best app to under volt with?
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asting said:
I don't know if you're familiar with overclocking, but the same type of stability issues can occur. When you're undervolting you can think of your stock speed as an "overclock" and you're just trying to minimize the voltage necessary for stability. If you undervolt too much you can experience freezing, corruption, bad lag, etc. It's all the same process for desktop computers, laptops, and anything else you can play with the voltage.
Personally I'm at -62.5, but after seeing how low people are going I might be a bit more adventurous. Don't use the "Set at Boot" option when you're experimenting.
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Right, I meant that there are no risks to undervolting in terms of physical damage to your phone, only stability issues which is fixed with a reboot, assuming you didn't set at boot. Overclocking is a bit different in that the risk overclocking presents in addition to stability issues is the risk of overheating which can permanently damage your phone. Undervolting can compensate for this somewhat by letting the power supplied to the processor and thus reducing the risk of overheat.
hiz99 said:
What's the best app to under volt with?
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I use system tuner, you can also look for Gideons script that is flashable in cwm to undervolt.
Im undervolted to -75mv for quite some time running a script clocked at 1.518min384
Sent from MY Juggernaut!!!:thumbup:
I have Gideon's OC/UV script. How could I edit it to undervolt by -100?
SupaKid said:
Nice!
Could I try your script?
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yup that's what I used lol.
So the other day I installed an unofficial version of cm9 on my Evo. As many of you know, cm comes with options to over clock out of the box. Sadly, with the stock kernel you can only go so far. I found a new kernel online, and flashed it onto my phone, only to find out it ruined the rom, forcing me to reflash cm9. I was wondering if there are any kernels that I can install to overclock my phone further? Pics included
fro453 said:
So the other day I installed an unofficial version of cm9 on my Evo. As many of you know, cm comes with options to over clock out of the box. Sadly, with the stock kernel you can only go so far. I found a new kernel online, and flashed it onto my phone, only to find out it ruined the rom, forcing me to reflash cm9. I was wondering if there are any kernels that I can install to overclock my phone further? Pics included
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atyoung's Mason ICS kernel should work...
May I ask why you have the desire to.overclock so violently? Most the time, underclocking will even show no loss In performance and save battery. All times I have overclocked, I've never noticed a major difference.. it may be slight but not enough for me to care..
why is your min/max the same?
The rom I downloaded is a little laggy, just wishing to speed things up a bit.
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fro453 said:
The rom I downloaded is a little laggy, just wishing to speed things up a bit.
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Ummm... You'll get terrible batt life with those settings... Min/max are the same
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One more thing.. pegging your CPU at max ghz will eventually destroy your device. The EVO is made with a single core 1 GHz snapdragon and so anything really over 1GHz will really put a strain on your processor. Best advice would be to either flash a new kernel, ROM, or find some tweaks to decrease lag. 1.2GHz isn't healthy for your phone...
Does anybody know if having the normal settings are better or under clocking (say 1Ghz) for battery for this particular phone?
I also know that a higher speed can perform the calculations faster and thus save power. But, I'm just curious if there is a sweet spot.
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Have you tried under volting, by using a custom kernel. Word of warning not all CPU built equal.
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I'm using Faux's kernel which had reduced voltage setting already.
I'm just curious.
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The best way to really tell woukd be to step the max freq. down by one or two and run it for a day or two. If it runs stable and you don't notice any issues you'll prob be good to go. My guess would be running between 1.2-1.3ghz would be a good spot.
I'm honestly not sure you'd see much difference in battery though since its probably running much slower than that most of the time its not sleeping anyway.
Plus I think I remember seeing somewhere that the power used to run at 1.5 is the same it uses to run at 1.3.
If your going to see improvement in battery its more likely you'll get that from voltage adjustments and your governor choice. You'd probably be best served by reading through the kernel thread to see what others have tried and reported.
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DocHoliday77 said:
The best way to really tell woukd be to step the max freq. down by one or two and run it for a day or two. If it runs stable and you don't notice any issues you'll prob be good to go. My guess would be running between 1.2-1.3ghz would be a good spot.
I'm honestly not sure you'd see much difference in battery though since its probably running much slower than that most of the time its not sleeping anyway.
Plus I think I remember seeing somewhere that the power used to run at 1.5 is the same it uses to run at 1.3.
If your going to see improvement in battery its more likely you'll get that from voltage adjustments and your governor choice. You'd probably be best served by reading through the kernel thread to see what others have tried and reported.
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That make sense.
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