Stock kernel vs custom kernel? - EVO 4G Q&A, Help & Troubleshooting

Why should one flash a custom kernel? I understand if you want to overclock your phone for what ever reason but if you want to improve battery life why would you flash a custom kernel? HTC's last two kernels, #17 and #15, have given me great battery life; I had ~15hrs with 20% yesterday. And I'm not sure if it was some blunder the other day but it seemed #15 lessened the battery drop after having charged the phone overnight if not having cured it completely, I'll have to test it later.
Right now I'm using netarchy 4.2.2 CFS nohavs and 9 hrs on 16% used and will see how it goes for next day or so.

You get 15 hours?
Can you post a screen shot of your battery usage?
Sent from my HTC Evo 4g using tapatalk!

I'll post it tomorrow, but I was studying all day and had unplugged the phone the night prior to it.

goodboynyc said:
I'll post it tomorrow, but I was studying all day and had unplugged the phone the night prior to it.
Click to expand...
Click to collapse
Check out this kernal...
Applies a trickle CHarge fix to the battery. Utilizes Netarchy
http://forum.xda-developers.com/showthread.php?t=876590

goodboynyc said:
HTC's last two kernels, #17 and #15, have given me great battery life; I had ~15hrs with 20% yesterday.
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Click to collapse
15 hours doesn't really mean anything. I hope you understand that. If not, I can explain to the deficient.

Is #15 the newest kernal and if so may i have the link to get thank you
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Related

MYN's 2.2 rls 3

Anyone found out what kernel works best with it for battery life. The kernel it comes with isn't that great on battery life. Sorry if this was already posted.
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Unfortunately, there are no definitives, and if you aren't getting good battery life with the stock kernel with warm2.2, you might want to start looking at some battery tweaks.
There is a thread over in the Evo 4g General forum, the title is "2.2 ultimate kernel review :: Updated 11/6/10" and the OP is skydeaner. His site also has one of the battery "fixes" if its not holding a charge correctly.
Unfortunately, I can't link to it, since I'm still a newbie poster, but, some of the higher rated ones are Kings #11, and the new Net 4.2 kernels.
phajen said:
Unfortunately, there are no definitives, and if you aren't getting good battery life with the stock kernel with warm2.2, you might want to start looking at some battery tweaks.
There is a thread over in the Evo 4g General forum, the title is "2.2 ultimate kernel review :: Updated 11/6/10" and the OP is skydeaner. His site also has one of the battery "fixes" if its not holding a charge correctly.
Unfortunately, I can't link to it, since I'm still a newbie poster, but, some of the higher rated ones are Kings #11, and the new Net 4.2 kernels.
Click to expand...
Click to collapse
Thanks I just downloaded kings 11 & net 4.1.9 stable I'll try 4.2 also
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Im having good luck so far with Nets 4.2.1 CFS more aggressive smartass universal.
There were a lot of people complaining about the awake time of the 4.2 build, so Net tried to tweak the 4.2.1 to have the great sleep time of 42 with the great awake time of 4.1.9
I havent had the phone awake alot today but with light use I have gone from 100% at 8 am to..... 75% at 10:30pm This was no browsing or games, just phone for about 5-10 minutes and maybe 5 minutes of texting only 1.25 hrs awake time total so far.... so very light use today. But ive NEVER had the phone stay 75-80% inot the evening.
I REALLY hope the awake performance is as good as the sleep performance. We'll see how it does tomorrow under some stress.
bigd2442 said:
Im having good luck so far with Nets 4.2.1 CFS more aggressive smartass universal.
There were a lot of people complaining about the awake time of the 4.2 build, so Net tried to tweak the 4.2.1 to have the great sleep time of 42 with the great awake time of 4.1.9
I havent had the phone awake alot today but with light use I have gone from 100% at 8 am to..... 75% at 10:30pm This was no browsing or games, just phone for about 5-10 minutes and maybe 5 minutes of texting only 1.25 hrs awake time total so far.... so very light use today. But ive NEVER had the phone stay 75-80% inot the evening.
I REALLY hope the awake performance is as good as the sleep performance. We'll see how it does tomorrow under some stress.
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Thanks a lot
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Just for a baseline, I just put my phone back to root to take it back, I've lost 50% over about 26 hours of moderate texting and usage with just JuiceDefender running.
I have Kings #11 and my battery blows. I drain 25% in less than an hour with moderate use. This is off topic but when you enable your 4G does it automatically turn off on you. I think my 4G is broken and just want to know. I may need to reflash it.
im runnin it with stock kernal and i have no complaints. I just took a screenshot showing like 43% left off charger for 14 hours and talk time was like 1hour and 23 mins. Plus iv used it to play mabey half hour of games and half dozen text. Il see if i can get the ss posted.
phajen said:
Just for a baseline, I just put my phone back to root to take it back, I've lost 50% over about 26 hours of moderate texting and usage with just JuiceDefender running.
Click to expand...
Click to collapse
I'll install juice defender and see how it works
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gqstatus0685 said:
I have Kings #11 and my battery blows. I drain 25% in less than an hour with moderate use. This is off topic but when you enable your 4G does it automatically turn off on you. I think my 4G is broken and just want to know. I may need to reflash it.
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Click to collapse
I haven't tried cause Detroit doesn't have 4g yet but I'll check
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erawtik said:
im runnin it with stock kernal and i have no complaints. I just took a screenshot showing like 43% left off charger for 14 hours and talk time was like 1hour and 23 mins. Plus iv used it to play mabey half hour of games and half dozen text. Il see if i can get the ss posted.
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Click to collapse
That's great my battery life was about 4 hours heavy use 6.5 moderate
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gqstatus0685 said:
I have Kings #11 and my battery blows. I drain 25% in less than an hour with moderate use. This is off topic but when you enable your 4G does it automatically turn off on you. I think my 4G is broken and just want to know. I may need to reflash it.
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Click to collapse
No it isn't unless you lose service completely I.e. a tunnel or if your battery goes too low
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hackulous said:
No it isn't unless you lose service completely I.e. a tunnel or if your battery goes too low
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Click to collapse
What rom are you using?
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Caulkins flash

So I flashed my phone last night with caulkins new rom, and can't figure out how to get the best battery life out of it. It has been unplugged for about two hours and I'm down to 75 percent with lite usage. Also where I'm at the cell service isn't the best, so I'm sure that is playing part of it. Thanks and I'm sorry if I posted in the wrong spot.
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rkd2398 said:
So I flashed my phone last night with caulkins new rom, and can't figure out how to get the best battery life out of it. It has been unplugged for about two hours and I'm down to 75 percent with lite usage. Also where I'm at the cell service isn't the best, so I'm sure that is playing part of it. Thanks and I'm sorry if I posted in the wrong spot.
Sent from my PC36100 using XDA App
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Give it a day or two. I noticed that when using the kernel he included that if I let it drain down and then recharged it that it seemed to get battery life after a day or two. Also, try other kernels. All kernels to different things better than others. You just need do some trial and error and see which one gives you the best life for your needs.

Battery sucks free root

Hello guys, I'm new to the scene but my phone has been rooted for a few months now and the battery life has been sucking lately. When I first rooted my phone I used SetCPU and it worked great, but it started freezing my phone. The most battery life I got was about 21hrs with light usage. On an average day I'd get about 18hrs with moderate usage. But lately, its been going downhill. I have about 3 EVO batteries and switch em from time to time when I don't have time to charge my phone , I use a 3rd party battery dock to charge my spares btw and it doesn't overheat/overcharge them. I no longer use SetCPU and I am now using the Overclock widget v3.26, and the latest versions of JuicePlotter/JuiceDefender which are 1.1.6 I believe. Please help, I'm stumped. I hardly even get 10hrs on moderate use. Specs are posted below. Any help will be greatly appreciated.
I cannot post any pictures so here they are
Android 2.2
Stock Kernel
Baseband 2.15.00.09.01
Fresh EVO 3.4.0.1 by flipz
PRI Version 1.77_033
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Bump. Please help.
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sianbootay said:
Hello guys, I'm new to the scene but my phone has been rooted for a few months now and the battery life has been sucking lately. When I first rooted my phone I used SetCPU and it worked great, but it started freezing my phone. The most battery life I got was about 21hrs with light usage. On an average day I'd get about 18hrs with moderate usage. But lately, its been going downhill. I have about 3 EVO batteries and switch em from time to time when I don't have time to charge my phone , I use a 3rd party battery dock to charge my spares btw and it doesn't overheat/overcharge them. I no longer use SetCPU and I am now using the Overclock widget v3.26, and the latest versions of JuicePlotter/JuiceDefender which are 1.1.6 I believe. Please help, I'm stumped. I hardly even get 10hrs on moderate use. Specs are posted below. Any help will be greatly appreciated.
I cannot post any pictures so here they are
Android 2.2
Stock Kernel
Baseband 2.15.00.09.01
Fresh EVO 3.4.0.1 by flipz
PRI Version 1.77_033
Sent from my PC36100 using XDA App
Click to expand...
Click to collapse
With that Rom I recommend kings #11 bfs worked wonders for me on fresh if bfs doesn't play nice with your phone try the cfs version or try netarchy's 4.2
Sent from my EVO at the edge of hell
Thanks, ill give it a shot. Keep you posted on the results. Still getting 8-9 hrs on a full charge. Sucks.
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Rom and kernel help!!!

I'm in a dilemma! For the last week I've been hunting around to find the right combination of Kernels and Roms. Natively I'm a CM ASOP man. But I've tried everything from CM to MIUI to Ava to Mym. None of the roms are giving a decent amount of battery life. I've tried several combinations of Kernels also. My battery life has been as terrible as 3 hours. I'm talking about losing a percent every minute!
I didn't buy an extended battery. But I have tried a brand new regular battery to make sure that I didn't have a bad battery. Both batteries have the same results under all combinations of Kernels and Roms.
I've seen members braggin on having 12 to 18th hours of life under heavy use! How is that possible!? Lol! I know it has to do with device, kernel, rom combinations.
Can the awsome members of the GREAT Xda please help me out? Point me in the right direction. fyi: I have a ver 003 device and also I don't overclock much at all but I underclock to try and save a lil juice!
Thanks in advanced!
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No matter what rom/kernel combination I run I get really ****ty battery life with the stock red HTC battery. For me personally investing the $70 or so for the Seidio extended battery on Amazon was worthwhile. I also purchased their wall charger as well.
I'm not going to blow smoke up your ass and say that the battery last 2 days with heavy use because thats BS. However, with heavy use (running emulators, gmail sync, occasional bluetooth for wii mote, texting, web browsing, etc) I can get through a 9 hour work day with a lil life to spare.
At least go on amazon and get a1800 mah battery. They are cheap but goood.
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I just bought another stock battery and a wall charger, I keep the spare in my wallet and battery life is a non issue now.
Check out batteryboss.org before buying an aftermarket one though, most of them are rips offs.
I'm not sure about rip offs on amazon but certainly ebay..i bought two batteries w/a charger for $25..and a third one since my oem battery took a bath, fully charged.
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I'm going to research some better batteries. I appreciate the intel. But my thing is I know I can get a few more hours of battery time with a simple kernel modification. Loosing 1% a minute is unheard of lol. Like now: I had 100% when I started this reply and I'm officially at 95% as I press Submit lol! Terrible
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DonSolo said:
I'm going to research some better batteries. I appreciate the intel. But my thing is I know I can get a few more hours of battery time with a simple kernel modification. Loosing 1% a minute is unheard of lol. Like now: I had 100% when I started this reply and I'm officially at 95% as I press Submit lol! Terrible
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Click to collapse
You should see if you can get a replacement battery from sprint. I am using CM7 nightly 24, and can easily sustain 24+ hours with the OEM red battery.
Everyone will have different results even with the same rom/kernel, however the drain that your experiencing does sound like your battery might be going bad.
Khilbron said:
You should see if you can get a replacement battery from sprint. I am using CM7 nightly 24, and can easily sustain 24+ hours with the OEM red battery.
Everyone will have different results even with the same rom/kernel, however the drain that your experiencing does sound like your battery might be going bad.
Click to expand...
Click to collapse
I see your stats and that sh*t is wicked! I used CM7 and that one drains the quickest lol.... before I cash out on a new extended battery where's an abundant source of Kernels? I've tried three and I wanted to do a little process of elimination before I pull out my visa lol
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There aren't very many CM7 kernel's available yet, so few that I can't even begin to tell you where to start looking, for Sense roms though, search for Netarchy those kernels work really well.
I see... I appreciate that! Imma give Mym a try with a few of them Kernels. Thanks again for the help
And what exactly is the Kernel that you are using!? Lol
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Honestly, I've found that the right kernel makes the biggest difference and setcpu, juicedefender, etc only make it worse. For me (also 003 hw) kings kernel and htc # 15 uv have been best. I've had great success with azrael and vaelpak roms. Currently on vaelpak with kings # 11 with NO battery saving apps. I get 24 hours with my regular use. Yesterday was very light, I went 24 hours with just under 50% left.
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(btw, that is on a stock battery, approx 5 months old)
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ms79723 said:
AOSP Builds
v7
12/25/10 - SBC for BC's Kernel SBC-bcnice-stable-v7.zip (2.62 MB)
This is what I'm currently using at the moment. So this gets all the updates as of right now.
v8-BETA
12/25/10 - SBC for BC's Kernel SBC-bcnice-stable-v8.zip (2.62 MB)
This is what I've been testing for a while. This build contains auto bump charging based on the voltage as opposed to the full charge method. I don't know how it works on extended batteries yet...but works pretty good on stock batteries. With this, you should have a better chance of picking up the phone at higher voltages.
Check out Savaged-Zen![/CENTER]
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I flashed the ver 8 with CM6. 1.2. so far I've gotten slightly better battery life. 20 minutes and I'm still on 99%. That's a whole lot better than losing 1% a minute lol! I'm still going to do another exhaustive research to pinpoint the best combination!
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I know you guys said that setcpu can make matters worse. Is it alright if I use it to underclock to 245x245 when the screen is off and if the battery ever goes over 110°F automatically? That's the only profiles i use to help with battery maintenance
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DonSolo said:
I know you guys said that setcpu can make matters worse. Is it alright if I use it to underclock to 245x245 when the screen is off and if the battery ever goes over 110°F automatically? That's the only profiles i use to help with battery maintenance
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Click to collapse
If your still using CM7, it has its own built in setCPU, I have mine set to ondemand 245min, 768max, and sorry for the delayed response, I went to lunch, however the Kernel I am using for my CM7 flash is just the stock kernel that comes with the initial build if CM7.
Khilbron said:
If your still using CM7, it has its own built in setCPU, I have mine set to ondemand 245min, 768max, and sorry for the delayed response, I went to lunch, however the Kernel I am using for my CM7 flash is just the stock kernel that comes with the initial build if CM7.
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OK I gotcha. One last thing and I'm finished bugging lol. I never knew exactly what the preset governors main jobs were and the differences between them. Which one is best for power saving?
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Best kernel for battery life?

Which .37 kernel gives the best battery life? I flashed Incredikernel last night and then charged the phone. This morning I used it for 10 minutes to check emails and the battery went from full to 79.
Oh, and I'm running CM7 RC2
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I'm also very interested in this. I just recently rooted/flashed CM7 RC2, and the battery life has been quite disappointing so far. Even with the unnecessary services turned off, my battery drains quite quickly.
I am rolling with SkyRaider 3.5, Lou's #8, an 1800mah battery and this morning, I shocked myself!
I left my house w/88% charged. Took my son to the dentist - used the phone for probably 44 minutes during that, just goofing off, reading, tweaking and whatevering ...
When I left the dentist office, 77%. Drove to work (1 hour) ... sitting at 74%.
I am also running the evo radio - which some say helps or doesn't - but I'm as happy as can be.
I turned off all of the memory management stuff and the phone is lasting longer...
I should also add - that I use Juice Defender, however when USING your phone, it is "defenseless". I find it to help me a lot with my "in my pocket" battery life. You still get txt and calls, you just don't get internet traffic.
YMMV
Where did you turn off the memory management features?
I've been using ziggys latest on Incredibly Re-Engineered Z and having great battery life. 14 hrs today off charger and was still at 50%.
Sanders
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trickster2369 said:
I've been using ziggys latest on Incredibly Re-Engineered Z and having great battery life. 14 hrs today off charger and was still at 50%.
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Click to collapse
Can you give me the link to it?
Op is looking for best .37 kernel, you guys are recommending .32 kernels which are incompatible with gingerbread.
Sent from my desire z inc port.
what is a kernel and where is there a list of other things you guys are saying so I decipher the lingo.,., sorry for the noob question
Sniperdog said:
what is a kernel and where is there a list of other things you guys are saying so I decipher the lingo.,., sorry for the noob question
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Troll around in the developer section for a bit, I think they even have a few stickies, you'll figger it out pretty quickly.
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