This kernel module allows you to run any stock HTC Froyo kernel with lowered CPU voltages. Reducing voltage decreases power consumption by the CPU, thus lowering heat and increasing battery life.
INSTALL:
You need root or an unrestricted recovery image (e.g ClockworkMod) to install this. The default settings decrease voltage by 75-100 mV which seems stable on my device (HTC Desire) and is reported to be fine on the EVO. Just download the attached file and select it from recovery or ROM Manager.
I've built "update.zip" files for the EVO 4G with Linux kernel versions 2.6.32.15-g746f4f0, 2.6.32.15-ge2fb08e, and 2.6.32.15-g59b9e50. You can check your kernel version in Settings->About phone->Software information.
Other HTC devices running Froyo are supported. If you have a different device, please give me the full version number and I can add an update.zip for it.
Full details and source are in the original thread in the Desire forum:
[KERNEL] Undervolt driver for the stock HTC kernel for Desire and others (2.6.32.15)
Update, 2010-11-22: Added driver for 2.6.32.15-ge2fb08e.
Update, 2010-11-23: Added driver for 2.6.32.15-g59b9e50.
recant: love this idea when trying to keep this stock
Sounds like it would go well with Fresh's new rom.
ericwgarza1 said:
Sounds like it would go well with Fresh's new rom.
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+ 1 on that I agree
sweet I like. Does it change the kernel version?
Too weak... funny considering there is more work involved in setting this up than most linux guys even do on a pc... let alone a phone.
tatnai said:
what's this here? sounds like an add on for those too weak at heart to flash a modded kernel. will likely find some friends, strong work.
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Sent from my PC36100 using XDA App
tatnai said:
what's this here? sounds like an add on for those too weak at heart to flash a modded kernel. will likely find some friends, strong work.
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Click to collapse
Maybe not. I run the netarchy kernel but don't OC because it seems to crash at random times. I use it because the battery life is better than stock.
I'll revert to a clean back-up and give this a try just for giggles.
I would like to see some results.
I say that because I have tried a few havs roms and get worse battery life.
I think what a lot of people don't realize unless they are heavily into overocking is that microadjustments just dont have much effect there needs to be some substantial drops to really have any effect on battery and heat.
I realize that this is no desktop or laptop cpu, and that this cpu is based off such low voltages but such minor voltage adjustments, 80-100mv just arent going to have the desired effect unless that equates to a "substantial" voltage drop.
Not to mention the fact that most of you are going to overclock your phone without the faintest idea that doing so, even with a lower cpu voltage, will still cause worse battery life. This is a fact.. to argue it is futile. Its the nature of the beast.. do some reading and find out for yourself.
You can overcome some things by using on demand overclocking but you have to do extensive testing to find the sweet spot.
fr4nk1yn said:
Maybe not. I run the netarchy kernel but don't OC because it seems to crash at random times. I use it because the battery life is better than stock.
I'll revert to a clean back-up and give this a try just for giggles.
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Sent from my PC36100 using XDA App
Nice work. I'm not interested in oc'ing, nor flashing a custom kernel. I may give this a go after a few others check in w/ results. I just want to know that it's stable.
I went to your other thread and saw the source. Clever solution, nice work. I really do like that you wrote a device to /proc that does a little more than report the frequencies back. This will make it very easy to write some scripts, or even a UI, that lets me tweak the settings. Hopefully I have some time to work on that in the upcoming weekends.
Will take a look at this first chance I get. Trying to finish my battery logger since everything available now doesn't log exactly what I want to know. Kudos.
Does this make HAVS obsolete ?
iscaela said:
This kernel module allows you to run any stock HTC Froyo kernel with lowered CPU voltages. Reducing voltage decreases power consumption by the CPU, thus lowering heat and increasing battery life.
INSTALL:
You need root or an unrestricted recovery image (e.g ClockworkMod) to install this. The default settings decrease voltage by 75-100 mV which seems stable on my device (HTC Desire) and is reported to be fine on the EVO. Just download the attached file and select it from recovery or ROM Manager.
I've built "update.zip" file for the EVO with Linux kernel version 2.6.32.15-g746f4f0. You can check your kernel version in Settings->About phone->Software information.
Other HTC devices running Froyo are supported. If you have a different device, please give me the full version number and I can add an update.zip for it.
Full details and source are in the original thread in the Desire forum:
[KERNEL] Undervolt driver for the stock HTC kernel for Desire and others (2.6.32.15)
Click to expand...
Click to collapse
Undervolting meaning only when screens off or on and off ?
I installed and will get the best battery life yet. Better than when I was with King and other kernels....thanks!!!
Anyone have any results from flashing this yet? How is battery life? Any stability issues?
look4wisdom said:
Anyone have any results from flashing this yet? How is battery life? Any stability issues?
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No stability issues and it seems to help on battery a little bit but I really can't tell a big deference. I was expecting for it to help out more. Thanks anyways OP for the share
i did say those little microvoltages aint gunna make any difference.
plus if you try to overclock you just cancelled any lowered voltages and actually cause higher power draw than stock mhz at stock voltages.
higher mhz equals higher power draw whether you have it undervolted or not.
you have to make a signifigant drop in voltage to make any difference at all. let alone if you try and overclock.
not trying to dog the guy who discovered this i am just sing plain and simple math, heat, and electronic voltages.
Sent from my PC36100 using XDA App
question there a some diference between this kernel and the once from King and Net, talking about battery life and performance
juancaperez2000 said:
question there a some diference between this kernel and the once from King and Net, talking about battery life and performance
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This isn't a kernel its just a couple of files that go with the kernel. One file for initial boot ect/initd and a .ko file that goes in system/lib/module folder.
I have an Evo, [email protected] #11. I would like to try it. Please build an update.zip to support it.
Cheers.
snovvman said:
I have an Evo, [email protected] #11. I would like to try it. Please build an update.zip to support it.
Cheers.
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OP
Sent from my EViO + PURE= PURE Baked EViO
Does anyone know of some good apps (preferably free) that I can use to overclock a rooted droid charge, with the latest altered beast ROM and kernel?
There aren't any overclock kernels at this point. Its being worked on. Just be patient.
Fe_Man said:
Does anyone know of some good apps (preferably free) that I can use to overclock a rooted droid charge, with the latest altered beast ROM and kernel?
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You can try tegrak from the market if you really want oc.
In all honesty, just wait for a kernel to come out that will actually oc. I'd love a kernel that uses voltage control and will wait for that...
Ahh, thanks. This is my first android device so I have no idea what to expect and when
If I can ever get my config straightened out, I was going to look into doing an OC kernel that uses Voltage Control, similar to nemesis2all's kernels for the Fascinate. Still trying to get a working config though.
My opinion though is that OCing the hummingbird processor is useless, and does little for performance on a day-to-day basis and only serves to give you big numbers in benchmarks while reducing battery life.
I mostly used the 1120 step skipping 1000 and scoring serious uv was awesome
Any particular reason?
You can adjust it with LiveOC in nearly every other kernel.
Harbb said:
You can adjust it with LiveOC in nearly every other kernel.
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ok, didn't know that liveoc also overclocked gpu...btw im at 110% and the phone reboots when playing, already tried to pump voltages +25 and it still reboots...should i raise them even higher?
Try a little higher. What kernel are you on now? If it still doesnt work after a fair bit of trial and error (with INT and ARM voltages), maybe it's just not meant to be.
LiveOC boost bus speed which will influence both memory clock and gpu clock?
Sent from my Nexus S using XDA
Harbb said:
Try a little higher. What kernel are you on now? If it still doesnt work after a fair bit of trial and error (with INT and ARM voltages), maybe it's just not meant to be.
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im on oxygen rom and using franco's kernel...cant seem to get liveoc working, but what is strange is that a while back i remember using liveoc at 110% and stock voltages and it worked with no reboots
I've seen it in some kernels but have no idea of what it is and what it is used for or its benefits.
Where you see this ?
I've seen it in trickster mod options for voltages and also I've heard it talking about UV I think. Any ideas?
It's basically a power saving feature. It would adjust the voltages according to the frequency your phone is working at the moment....or at least that's what I understand about it.
I guess this is kernel related and Franco even started a thread to adjust the Smartreflex code for optimal performance:
http://forum.xda-developers.com/showthread.php?t=2078743
Info about SmartReflex:
http://focus.ti.com/asia/download/TechDay09kr_Track2_5.pdf
binlalo said:
I've seen it in some kernels but have no idea of what it is and what it is used for or its benefits.
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Wrong section. Galaxy Nexus stuff, not Nexus S...
Hi XDA Community. Can you guys be kind enough to explain to me(us) what it does when you tweak it? Does it help the phone? In what ways? I'm able to enter kernel tweaks because of the Rom Toolbox app and i don't wanna touch it without knowing what it does. My phone is at Stock Clock 2265-2266MHz and the Voltage control right now is at 1050mV and it is able to be maximized at 1600mV. I use Trinity Kernel by Morfic.
Check out this thread. It should help you out. http://forum.xda-developers.com/google-nexus-5/general/nexus-5-undervolting-thread-t2537000
Although some people disagree about battery life. I think most people just do it to reduce the heat the phone produces.
MaLing15 said:
Hi XDA Community. Can you guys be kind enough to explain to me(us) what it does when you tweak it? Does it help the phone? In what ways? I'm able to enter kernel tweaks because of the Rom Toolbox app and i don't wanna touch it without knowing what it does. My phone is at Stock Clock 2265-2266MHz and the Voltage control right now is at 1050mV and it is able to be maximized at 1600mV. I use Trinity Kernel by Morfic.
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Controls the voltages each frequency runs at. People undervolt (lower the voltage), not overvolt (maybe for 3014MHz but not stock clocks), because the factory defaults are set higher than what is actually needed just to be safe, as every device is different. Only real advantage is a little bit less heat, battery savings is too negligible. Lowering it too much will cause bootloops. Raising it is silly.
Read above thread for more.
Thanks guys for sharing your knowledge.