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.

[Q] Kernels for HTC EVO

I'm new to kernel flashing. I have been playing around with snap and kings kernel. I don't have a problem flashing snap, but once I have it installed it works fine for awhile, but then it reboots itself or goes into a state where it won't turn on and I have to pull the battery. I tried 7.6 both bfs and cfs and the same thing happens. I also tried 7.5 but once I flashed it nothing showed up in the apps to install.
For kings kernel I flashed it and it booted up fine but it seemed to freeze up and I couldn't unlock my phone after the boot.
Am I doing something wrong when I am flashing these? I am running the nightlies of cyanogen. Also, What are some other kernels that work well with cm?
Thanks!!!

Kernals seem to be a taste for the phone itself and not the rom...
My Evo doesnt seem to like any other kernals than stock I have tried many rom/kernal combos and the only way i get no issues and best battery is to run stock kernal
I ran fresh with netarchy and kings like some others-that had great battery and mine just drained fast so I am done with the kernal swapping for now and jut keep playing with roms.... Trying out Virusrom right now not bad so far

Try wiping the cache and dalvik cache before flashing the new kernels. That might help.

Another thing that might help is posting this in the right section. More people with the knowledge and good insight that you need will be more apt to answer you in the Q&A section.

I've tried clearing everything including data but it still would self reboot

the snap kernels do not work with the recent versions (nightlies) of CM.
The framework has been redone, and you will freeze.
You have to use the stock kernel.
Ziggy just made an AOSP kernel, but its buggy.
Toast has a .35 kernel that works good on the new frame work.

I just was able to use a different kernel of kings. It really doesn't enhance quadrant scores, but im want to see what it does to the battery. Where can I download toast.
Also, I noticed that now my unlock screen is different from my wall paper. Is that a kernel issue?

Check to make sure SetCPU is disabled (or any other overclocking utility), and wipe your cache/dalvik. If all else fails, go with the Snap 7.6 failsafe method.

Kings AOSP #1 has worked best for me using cm nightlies. I have easily doubled my battery life. Has anybody else had success with any other kernels? Is toast an AOSP kernel?

as TheJoker and drmacinyasha commented...
snap and king use the .32 kernel. snap http://forum.xda-developers.com/showthread.php?t=733099
cm6 nightly is currently using .34 kernel
Toast has a .35 test1 kernel available for CM6 (http://forum.xda-developers.com/showthread.php?t=735596)
ziggy has a kernel as well. (http://forum.xda-developers.com/showthread.php?t=819402)
zendroid has a kernel - http://forum.xda-developers.com/showthread.php?t=831021
turn off setcpu until after you reboot with the new kernel. don't forget to read the kernel threads OP for possible hints on setcpu configs (ie: snap7.6 works well with conservative governor)
yes they are all AOSP.
i would not advise a newbie to play with the snap or king kernels until the .35 revisions have been released. this is due to changes in the Framework.apk file. you are likely to find that a current CM6nightly w/ the snap7.6 kernel = no bluetooth. new kernels should be hitting shelves very soon. personally, i'm looking forward to loading up the snap kernel once its done cooking, i really liked that kernel.
most are just fine with the stock kernel
many have commented positively on the toast test1 kernel (aside from a hang issue at startup)
ziggy & zen have a bit of work to do on their kernels it seems.
once .35 is 'done' you'll find a bunch of movement on the the kernel threads.

DraginMagik said:
as TheJoker and drmacinyasha commented...
snap and king use the .32 kernel. snap http://forum.xda-developers.com/showthread.php?t=733099
cm6 nightly is currently using .34 kernel
Toast has a .35 test1 kernel available for CM6 (http://forum.xda-developers.com/showthread.php?t=735596)
ziggy has a kernel as well. (http://forum.xda-developers.com/showthread.php?t=819402)
zendroid has a kernel - http://forum.xda-developers.com/showthread.php?t=831021
turn off setcpu until after you reboot with the new kernel. don't forget to read the kernel threads OP for possible hints on setcpu configs (ie: snap7.6 works well with conservative governor)
yes they are all AOSP.
i would not advise a newbie to play with the snap or king kernels until the .35 revisions have been released. this is due to changes in the Framework.apk file. you are likely to find that a current CM6nightly w/ the snap7.6 kernel = no bluetooth. new kernels should be hitting shelves very soon. personally, i'm looking forward to loading up the snap kernel once its done cooking, i really liked that kernel.
most are just fine with the stock kernel
many have commented positively on the toast test1 kernel (aside from a hang issue at startup)
ziggy & zen have a bit of work to do on their kernels it seems.
once .35 is 'done' you'll find a bunch of movement on the the kernel threads.
Click to expand...
Click to collapse
Thanks! this really helped. This may be a dumb question, but where do you find out what kernel runs with the ROMS. eg .35
I really want to find a good combination that gives me good battery life and performance. so will snap 7.6 work with cm 6.1 rc 1 rom?

I saw for CM6.1 the stock kernel is the best. I have gotten the best performance, battery life, and bug free with the stock kernel.
Snap 7.6 would get stuck on the splash screen and required several battery pulls.
Toast .35 works good, but after about an hour or two for some reason it brings my fps cap down to 37, so all my scrolling and games run like ****.
Wait for Snap 9 or the official toast .35 kernel. Stock is just fine.

I was bored last night and tried cm 6.1 with snap 7.6 just for fun, but it seems to be working fine. The boot was quick too, it was on the cyanogen boot image for about 3 seconds before it started up. Quadrant scores are in the mid 2000s. No problems with anything else so far.
Is there a snap website or channel log? I can only fined directories.

[Q] Kernels?

Ok... can someone please tell me what HAVS, CFS and SVS means?

HAVS - no idea
CFS - http://en.wikipedia.org/wiki/Completely_Fair_Scheduler
SVS - no idea

lol... i guess google is my friend
HAVS (Hybrid Adaptive Voltage Scaling) What this does is provide SUPERIOR BATTERY
Really? Anyone else use these kernels? Whats the risk, is it risky like flashing a Radio?

KevAmiga said:
lol... i guess google is my friend
HAVS (Hybrid Adaptive Voltage Scaling) What this does is provide SUPERIOR BATTERY
Really? Anyone else use these kernels? Whats the risk, is it risky like flashing a Radio?
Click to expand...
Click to collapse
No, only thing is some undervolted kennels might not be stable so always nandroid before changing kernel.
Sent from my HTC Desire using XDA App

Brill - I have some Nandroid backups, so if anything goes wrong the recovery will still work, and I can restore... excellent. Thought so

AOSP Kernel for SENSE ROM?
http://forum.xda-developers.com/wiki/index.php?title=FAQ#Kernel
here's a link with "all" neccesary informations
--------------------------------------------------------------
i would like to add a new question in this thread:
is it possible to use an AOSP Kernel like: http://forum.xda-developers.com/showthread.php?t=893484
with my SENSE-ROM ? (currently using ReflexTSense http://forum.xda-developers.com/showthread.php?t=791315 )
thx

No, at least I know that way. You have to use a Sense kernel with a sense ROM, like this to run without problems.

so there's no option to use newer Kernels with Sense-ROM's ..
thx for the information

Sorry to break into your thread, but does it work the other way round? I mean, is it possible to use a Sense kernel with an AOSP rom?

sense with asop and the other way
i tride som ASOP Kernel with my SensHD Rom and it worked "booting
i found a flickerning screen but it worked; i refalashed a sense kernel
i think that the other "Way" should also work with some "issues"
greetings..
ps: i somewhere on thos forum found a discussion between two ROM-Programmers about using ASOP Kernel in Sense roms.
As far as i remember they both found the conclusion that sense-kernel are using differetn Graphicdrivers so that a asop kernel never will run "full" with a sense-rom but the ASOP Kernel COULD be modded in "future"

[Q]Savaged-Zen Issue, or recommend a kernel for stock rom

I tried the latest Savaged-Zen froyo kernel and the speed is excellent but I get random horizontal lines on the screen. Especially on anything that loads or refreshes like the notification bar or facebook loading icon.
Never really flashed a custom ROM or anything, the only thing I did was install Rom Manager and added a recovery. I just want to be able to boost up the speed safely and I read kernels are the best way.

That's called screen tearing, so you should change. I recommend the savaged-zen froyo kernel, or since you're on sense, the net-archy kernels have good reviews.
And you flash a kernel just like a rom > wipe cache and dalvik, then flash the kernel.

I used to have screen tearing all the time but on tiamat I got none.
Sent from my PC36100 using XDA App

teh roxxorz said:
That's called screen tearing, so you should change. I recommend the savaged-zen froyo kernel, or since you're on sense, the net-archy kernels have good reviews.
And you flash a kernel just like a rom > wipe cache and dalvik, then flash the kernel.
Click to expand...
Click to collapse
I already tried the Savaged-zen and i tried a few of their older froyo builds. I just realized that since I never flashed any custom ROMS my phone is still sense based and these kernals are AOSP based, is that the reason?

dickpills said:
I already tried the Savaged-zen and i tried a few of their older froyo builds. I just realized that since I never flashed any custom ROMS my phone is still sense based and these kernals are AOSP based, is that the reason?
Click to expand...
Click to collapse
Absolutely, I was just about to inform you of that. Those kernels are only for AOSP roms. If you stay on sense, you need to try a Sense kernel. I have great luck with Netarchy's or Ziggy's kernels. Good luck
www.ziggy471.com
http://forum.xda-developers.com/showthread.php?t=719763
Edit, and to OP, your SN is hilarious. LOL. 'dickpills'

k2buckley said:
Absolutely, I was just about to inform you of that. Those kernels are only for AOSP roms. If you stay on sense, you need to try a Sense kernel. I have great luck with Netarchy's or Ziggy's kernels. Good luck
www.ziggy471.com
http://forum.xda-developers.com/showthread.php?t=719763
Edit, and to OP, your SN is hilarious. LOL. 'dickpills'
Click to expand...
Click to collapse
Cool, that makes sense. Netarchy's seems to pop up a lot in my research so I'll give it a go. And thanks for the comment, haha.
*Update: so far so good, I'm seeing much better frame rate but not as good as I was experiencing with Savaged-Zen. I never really used a benchmark to get actual numbers I'm mostly going by eye. I'm actually considering trying out various ROM's just to be able to use Savaged-Zen. What I love about Android is that I can easily customize the scrub way through apps, trying out custom Roms, themes or if I'm feeling brave I can go in and edit anything myself by replacing files. The community is great so new things are always coming out and I'm never bored with my phone.

Put a battery saving kernel on a Sense Rom w/ Stock Kernel?

I have ThunderSense v1, and I would like to know if there are any kernels that I can put on my HTC DESIRE CDMA to be able to undervolt using SetCPU. It is Sense 2.2 by the way.Thanks.

Belswick67 said:
I have ThunderSense v1, and I would like to know if there are any kernels that I can put on my HTC DESIRE CDMA to be able to undervolt using SetCPU. It is Sense 2.2 by the way.Thanks.
Click to expand...
Click to collapse
Set CPU Doesn't undervolt. It underclocks (Which in turn, lowers voltage).
Have a read here:
http://androidforums.com/desire-all...-bfs-axi-uvoc-published-20th-july-2011-a.html

well, still. is there a undervolted kernel that i can get?

Yes. All of them.
Did you see the "Everything desire is here thread"?
http://forum.xda-developers.com/showpost.php?p=12350779&postcount=3

Thanks man. but i have ONE more question.. Will any of the sense kernels work on a CDMA? cause i know that alot of work done is just for GSM. I dont want to mess up my rom, i know i can do a nandroid. but still... lol
edit: This is a Froyo Sense Rom, and every kernel that i see on there, is for GingerSense... ):

Thats a very good question, which unfortunately I do not know. I have no experience of CDMA devices. Possibly not actually

Alright bro, thanks anyways.

I think the issue is that decent kernel source wasn't available for the not so widely used CDMA.
From what I can tell, many Sense Kernels will work, but its the radio that is an issue, more explicitly, WiFi breaks...

Yup, the kernel source is actually the same. The compiled binary that most people release has bravoc disabled in some drivers (for making the kernel marginally smaller in size, like the wifi driver you mentioned). In almost every source file, there are if blocks to check whether the device is bravo/bravoc/passion.

Droidzone said:
Yup, the kernel source is actually the same. The compiled binary that most people release has bravoc disabled in some drivers (for making the kernel marginally smaller in size, like the wifi driver you mentioned). In almost every source file, there are if blocks to check whether the device is bravo/bravoc/passion.
Click to expand...
Click to collapse
In which case, do you know of any where bravoc has not been commented out? Have yours?
I dont know alot about sense kernels.
I assume Like AOSP, froyo and GB require different kernels. But how about GB ACES port v Runnymede? Can they use the same kernels?

rootSU said:
In which case, do you know of any where bravoc has not been commented out? Have yours?
I dont know alot about sense kernels.
I assume Like AOSP, froyo and GB require different kernels. But how about GB ACES port v Runnymede? Can they use the same kernels?
Click to expand...
Click to collapse
I haven't enabled the bravoc drivers either while compiling, though it's easy enough to enable it while building. Yup, my GB kernel's being used in a couple of the runny Ports and seems to work well. Don't know about Ace, but I believe the same kernel ought to work on it.