Develop Bugs

Undervolt Kernal?? Would this work for the EVO?

I currently have a hero and my gf just got the EVO and the battery life is pretty rough on it of course like we all know but i just flashed an under-volt kernal and it seems to work very well, is this possible yet for the EVO? Here are the links below about the topic
Under-volt Theory
http://forum.xda-developers.com/showthread.php?t=697286
Kernal for HTC Hero w/undervolt
http://forum.xda-developers.com/showthread.php?t=722073

AFAIK, most of the kernals we already have available undervolt the CPU.

okay, sorry im a noob to the EVO, as of yet i dont own one, i have a very good undestanding how ever thing works with my hero. So like the latest Fresh Rom for the EVO, has undervolt?

BAttitude7689 said:
okay, sorry im a noob to the EVO, as of yet i dont own one, i have a very good undestanding how ever thing works with my hero. So like the latest Fresh Rom for the EVO, has undervolt?
Click to expand...
Click to collapse
Fresh Rom is a ROM, not a kernel. The kernel that comes with Fresh Rom by default is the stock HTC kernel which has no undervolting. You have to flash an alternate kernel after you flash the ROM which will allow undervolting.
There are a few kernels from which to choose from available here.

BAttitude7689 said:
I currently have a hero and my gf just got the EVO and the battery life is pretty rough on it of course like we all know but i just flashed an under-volt kernal and it seems to work very well, is this possible yet for the EVO? Here are the links below about the topic
Under-volt Theory
http://forum.xda-developers.com/showthread.php?t=697286
Kernal for HTC Hero w/undervolt
http://forum.xda-developers.com/showthread.php?t=722073
Click to expand...
Click to collapse
There are several threads in her in the dev section here with various kernels for the hero. I use Damage Control 3.2.3 ROM and therefore use a kernel from the developers there. However there is another thread (not ROM related per-se) that goes deeper into the different kernels that are available and being worked on. If you prefer another ROM search those threads... Since the release of the complete source code recently several dev's are tweaking the kernels to integrate with their ROM's.
Seek and yee shall find... (If you go to the DamageControl link, Look for info on post #2. You will have to scroll a bit because it's a beast as is the size of the thread.

I think Baked Snack ROM does the most undervolting. He said he has undervolted it so low with stability.
That ROM does wonders to your battery... let me just say that.

What is a kernal

I am running the mik ROM 3.0 and I am not sure what a custom kernal is or how to flash a kernal is it the same as a rom?? How do I apply a kernal while using my ROM?? I have searched the forums and couldn't find an answer plz help me out thanx
Sent from my PC36100 using Tapatalk

reaper559 said:
I am running the mik ROM 3.0 and I am not sure what a custom kernal is or how to flash a kernal is it the same as a rom?? How do I apply a kernal while using my ROM?? I have searched the forums and couldn't find an answer plz help me out thanx
Sent from my PC36100 using Tapatalk
Click to expand...
Click to collapse
A custom kernel lets you overclock and under clock. So you can actually choose what speed you want your phone to run. First download the kernel put it on the root of your sdcard (not in any folders) go to recovery wipe cache and dalvik cache then flash kernel then reboot
Sent from my PC36100 using XDA App

The kernel controls certain hardware functions such as process scheduling, CPU clock speeds and voltages, frames per second, battery charge/discharge behaviors, etc. The best possible "layman's" analogy that I can think of is that a kernel is similar to hardware drivers that you install onto a computer. The drivers tell your system how to use whatever hardware components you've got installed.
There are a few rules with kernels though. You can't just download any kernel, flash it, and go on your way.
1. Sense kernels ONLY work with Sense ROMs. AOSP kernels ONLY work with AOSP ROMs.
2. Don't use a HAVS kernel if you're using setcpu.
3. Don't bother flashing a kernel if you don't know what a kernel is or are incapable of reading the sticky, at the top of this forum, whose sole purpose is to explain everything about kernels. Because chances are you're just going to screw up your phone.
Threads about kernels are one of the most common questions on this site, next to battery life issues and ROM preferences. Use the search feature. I guarantee there are a million threads that have already answered your question. If all else fails.....Google.
Edit: kernels do more than just letting you overclock your cpu like evo4gnoob said. If you don't know what a kernel is then you probably shouldn't be overclocking your phone anyway. And no, overclocking your Evolution is not like overclocking your computer. Again, you're likely to damage your phone if you just go and start tinkering without a clue as to what you're actually doing.

What is the best kernel to use with the new express rom?

I installed the new Express rom without installing a new kernel so I still have the stock kernel that is on the phone. I wanted to change to another kernel that goes well with this rom especially helping with battery life. What do you guys suggest? I was reading on the other forums and read to go with classic sbc kernel? not sure what is or where I would find the kernel to download. Thanks for the help!

There is no right answer. Different people have different results with the same kernel, so just try a few of the popular ones out for yourself. Experiment with different governors and I/O schedulers too.

Here:
http://forum.xda-developers.com/showthread.php?t=1557248

htc1005 said:
I installed the new Express rom without installing a new kernel so I still have the stock kernel that is on the phone. I wanted to change to another kernel that goes well with this rom especially helping with battery life. What do you guys suggest? I was reading on the other forums and read to go with classic sbc kernel? not sure what is or where I would find the kernel to download. Thanks for the help!
Click to expand...
Click to collapse
This is just my two cents but I would personally go with either #1 choice: Underworld Kernel. Plan B: #2 choice: Mason Kernel.

[Q] Questions regarding kernels and rom

Long time lurker, first time poster :3. Anyways, I have a few questions regarding the flashing of ROMs and kernels. I have been looking around for a nice ROM(s) or a kernel(s) to flash the t989. Currently I am running on rooted stock and want to mix it up a bit. I came across the Darkside X v1 Final kernel located here: http://forum.xda-developers.com/showthread.php?t=1466283&page=44 .
Now the question is can I flash this kernel but retain the stock ROM?
- any advantages vs flashing kernel and a new ROM?
- disadvantages?
Is there anything that I should be concerned about, or pay special attention to before proceeding with this?
Thanks!

ohaiu said:
Long time lurker, first time poster :3. Anyways, I have a few questions regarding the flashing of ROMs and kernels. I have been looking around for a nice ROM(s) or a kernel(s) to flash the t989. Currently I am running on rooted stock and want to mix it up a bit. I came across the Darkside X v1 Final kernel located here: http://forum.xda-developers.com/showthread.php?t=1466283&page=44 .
(1) Now the question is can I flash this kernel but retain the stock ROM?
- (2) any advantages vs flashing kernel and a new ROM?
- (3) disadvantages?
(4) Is there anything that I should be concerned about, or pay special attention to before proceeding with this?
Thanks!
Click to expand...
Click to collapse
(1) Yes you can, just wipe cache and dalvik cache prior to flashing kernel
(2) Depends on what the kernel has to offer. I'm not super well informed on tdjs kernel but for one you get BLN support which is great. You also get performance and battery enhancements plus many other goodies.
(3) Not really, any kernel on these forums is better than stock so you're looking at nothing but advantages.
(4) As long as you follow the proper steps to installing a kernel you should be fine. Common sense is your friend. Once you flash a specific kernel you might want to look at under clocking and under vaulting to extend your battery life with minimal performance decrease.
BONUS: TDJ's Darkside ROM and Eugenes Streamline Kernel are the best for me. Great stability, battery and performance. Refer to my signature for links.
Best of luck

The best advice I can give is Back up your stock rom with rom manager and back your apps with titanium, after that you can flash flash any rom and take it on a test drive to see how it feels. If you see it's buggy you can go back to the stock you had to begin with like you never did a thing.
Personalty I tried most of the ICS roms an found bugs I just couldn't deal with in one way or another. I did find this ICS rom today
http://forum.xda-developers.com/showthread.php?t=1623430
This has the leaked tmo kernel and radio making it almost the complete update we so deserve lol. anyway I put it on today and sofar all I could say is it is sweet no bugs this far and love the ICS......
Last advice is before flash do the darkside super wipe this does a better job then just wipe cache and dalvik cache and you dont lose the data you have backed up.
Oh also follow the directions from any rom to the tee to lessen the chance for problems

[Q] Questions regarding kernels and romArrow
Thanks for the input guys. Right now, I would like to experiment with a new kernel before going full-blown with a ROM...I will likely do that later down the road.
Now, while I was reading up on the various kernels and their offerings, another question popped into my head. Will flashing the phone with a new kernel purge pre-existing applications and settings? I will be backing up regardless, but I just thought I'd ask.

ohaiu said:
Thanks for the input guys. Right now, I would like to experiment with a new kernel before going full-blown with a ROM...I will likely do that later down the road.
Now, while I was reading up on the various kernels and their offerings, another question popped into my head. Will flashing the phone with a new kernel purge pre-existing applications and settings? I will be backing up regardless, but I just thought I'd ask.
Click to expand...
Click to collapse
no

[Q] RenovatePLUS rom help! + kernel/etc questions

Hi guys I have just flashed this ROM (http://forum.xda-developers.com/showthread.php?t=1705334) however it is not the renovatePLUS version, how do I flash with the PLUS version, need it since it has mods and tweaks which I will need, auto-inverted rotating screen is driving me nuts!
FYI: I downloaded the plus zip but I dont know what to do with it, do I just extract into my phone? Because that did not work.
Also, I saw this guy, username(csec) with this signature (Phone: Renovated Endeavoru, F4, XM-Kernel #296 (Most fantastic combo in my entire experience with HOX)). I want to use have those thing stated, already have Renovate(will flash PLUS once I know how), and there is F4, anyone knows what that is? and finally XM-Kernel #296, which I believe is this (http://forum.xda-developers.com/showthread.php?t=2136731), can anyone please confirm is that is a similar one that I can use? Sorry for asking so many question, I finally decided to go deeper with flashing kernels and stuff and I require some professional advice, so please help! Thank you!

SwtVengeance said:
Hi guys I have just flashed this ROM (http://forum.xda-developers.com/showthread.php?t=1705334) however it is not the renovatePLUS version, how do I flash with the PLUS version, need it since it has mods and tweaks which I will need, auto-inverted rotating screen is driving me nuts!
FYI: I downloaded the plus zip but I dont know what to do with it, do I just extract into my phone? Because that did not work.
Also, I saw this guy, username(csec) with this signature (Phone: Renovated Endeavoru, F4, XM-Kernel #296 (Most fantastic combo in my entire experience with HOX)). I want to use have those thing stated, already have Renovate(will flash PLUS once I know how), and there is F4, anyone knows what that is? and finally XM-Kernel #296, which I believe is this (http://forum.xda-developers.com/showthread.php?t=2136731), can anyone please confirm is that is a similar one that I can use? Sorry for asking so many question, I finally decided to go deeper with flashing kernels and stuff and I require some professional advice, so please help! Thank you!
Click to expand...
Click to collapse
if u read the thread it will answer all ur Questions
flash the Renovate Plus through recovery <<< in the rom thread
if u want a banner with renovate check its thread
F4 stands for final 4
my advice gain some experience before flashing kernels u may brick ur device!
if u dont know what u are doing

Thanks!
The5alodi said:
flash the Renovate Plus through recovery <<< in the rom thread
Click to expand...
Click to collapse
It doesnt seem to state on that thread that I have to do it through recovery. But thanks anyway!
For kernels I have one more question. Can I just use the kernel as provided? Of course checking that it is meant for my device 1st. Because there seems to be this confusing thing called repacking...

SwtVengeance said:
It doesnt seem to state on that thread that I have to do it through recovery. But thanks anyway!
For kernels I have one more question. Can I just use the kernel as provided? Of course checking that it is meant for my device 1st. Because there seems to be this confusing thing called repacking...
Click to expand...
Click to collapse
I RUINED my device before with kernels i didn't know how to use them and obviously i bricked my device so please dont try anything unless u gain experience
Repacking is like making peanut and jam sandwich its like making the kernel work with ur rom if u are using renovate u dont need to repack for XM kernels
Sent from my HTC One X using xda premium

If there are no Ramdisc tweaks in the ROM, you don't need to repack the kernel... Mostly kernel repacking isn't needed for Sense roms... So you just have to flash the boot.img from the kernel's zip and then flash the modules from recovery...
AOSP/AOKP Roms need kernel repack each and every time before flashing!

vin4yak said:
If there are no Ramdisc tweaks in the ROM, you don't need to repack the kernel... Mostly kernel repacking isn't needed for Sense roms... So you just have to flash the boot.img from the kernel's zip and then flash the modules from recovery...
AOSP/AOKP Roms need kernel repack each and every time before flashing!
Click to expand...
Click to collapse
Sense roms these days are a lot so i suggest repacking as it will not do any harm!
Sent from my HTC One X using xda premium

Help once more!
Hi, so after researching a little bit more, I decided change my kernel to the XM kernel(original non-repacked), tried it for a few days, noticed that it response quite slowly compared to default kernel, things like slow display of lock screen upon power on, less smooth transition when. Could I have done it wrongly? Other than the slow response everything else seems fine, I noticed one of the features is S2W, I tried that on my buttons and it worked, however fast charge usb and usb mass storage isnt working, is there somewhere I can enable it or do you have an idea where I can find a guide for XM kernels that describes its features and functionality? Sorry for asking so many questions, thank you!

You have rather detailed instruction how to deal with fast charge and USB mass storage in XMister's thread (first one or two posts).
I suggest you install some of the kernel manageent applications:
- trickster MOD
- Set CPU
... There are many. Choose one that fits you (I am personally using Trickster).
There you will be able to play with your governors and scheduler, and thus achieve better performance or battery life. Or both. Check Q&A, there are few very educative threads about it.
You seem to be on a good way. Keep reading.
:good: