Kernels/Modems - Captivate Q&A, Help & Troubleshooting

Hey guys I'm really new at this, can some someone explain what a Kernel/Modem is. I know what the Kernel is used for but, there are some many different Kernels that people use and I have no idea on how to pick which one is right for me. Currently I'm running Cognition 3.04 with Stock Kernel with Voodoo Lag fix.

a modem deals with signal and data speeds (different modems work better for people in different places) i9000 modems can only be used with i9000 roms and vice versa for the captivate roms (cognition)
modems thread (http://forum.xda-developers.com/showthread.php?t=835272)
a kernel deals with drivers (not 100% sure) oc/uv (overclock, undervolt), free ram, and tweaks that make it faster/smoother.
gb's kernel thread (http://forum.xda-developers.com/showthread.php?t=887315)
seitron's kernel thread (http://forum.xda-developers.com/showthread.php?t=828052)
if you want more clarifications just ask

ok so with my current configeration, ,I can run any captivate based rom right?(im running cog3.04) and say I wanted to try those i9000 roms I have to change my modem not my kernel, correct?
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Vik_92_Sandhu said:
ok so with my current configeration, ,I can run any captivate based rom right?(im running cog3.04) and say I wanted to try those i9000 roms I have to change my modem not my kernel, correct?
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Click to expand...
Click to collapse
When you flash a rom it will change the kernel and modem
Any i9000 will come with compatible modem and kernel

Oh ok I see so just flash the rom, thanks for the help, greatly appreciated.
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Related

[Q] Darky's rom v 7.7 reception issue

hey guys , i have flashed several rom and i really like the look and feel of the darky's rom however i have really bad reception issue. sometimes at home where i usually have full bar i have no signals at all , or last night i was traveling to Oklahoma city with my friend who is running captivate on stock rom and he had full bar while i had no service at all ! any idea what i'm doing wrong ?
Usually better to ask in the darky thread , but anyways.
Did you flash back to stock and then upgrade to darkys or did you upgrade on top of a previous rom? If the latter, flash back to stock and reinstall.
If the former, try a different modem. I am not using the modem or kernel that came with darkys rom. I am using the kernel with speedmod and ugjl2 modem and so far I have great reception. Of course that isn't saying much as I always have great reception using my cell device (can't think of its name atm.)
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You are running the I9000 version and not the captivate port. This alone wont cause problems if you have the reoriented kernel but the jpy modem you have will. I believe it does not have the 850 band. Flash a different modem from the modem thread in the development section and you should be good to go.
If im mistaken please forgive as its 7:30am and I still haven't slept yet.
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thanks for your reply ! well yea i did one click odin to stock 2.1 and then flash this using this guide http://forum.xda-developers.com/showthread.php?t=868262
and http://forum.xda-developers.com/showthread.php?t=808286 flashing xcaliburinhand's latest reoriented kernel (odin version) with voodoo (I9000_reoriented_v2.3.0) so i'm not sure what is the issue here ... can you all guide me what modem should i use ? i was actually thinking about the same thing because i use to have a phone that didn't have 850 bad and i had this kind of issue ! so any help of how and where to get a modem to flash will be greatly appreciated !
I personally use JK4. A lot of people find that JL3 works better for them. Either way at the moment these are the top two modems available. Both can be found here http://forum.xda-developers.com/showpost.php?p=9134296&postcount=2 and are flashable via CWM.
Also next time you are going to flash a version of Darky's just use this thread http://forum.xda-developers.com/showthread.php?t=890429 or any one that ytt3r starts because he ports them over to the captivate and you don't have to worry about messing with kernels or anything not working properly.
thanks i'll try it next week , since i'm running Axura 2.2 and so far i like it

[Q]Hspa on stock froyo rom....?

Hi i have a question about allowing the hspa network on stock froyo rom....
How would i go about doing this?
Flash a new modem? Possible one from an hspa capible device like the i9000?
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http://tinyurl.com/66n2a6t
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Would i also have to use an i9000 kernel or could i use my current existz voodoo kernel?
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Kernels have to match modems. kb1 to kb1, i9000 to i9000.
So is running a i9000 kernal better than using a captivate kernal?
if so what are the pros and cons if any?
rom kernal match
Look. I've tried different kernals with stock froyo 2.2 and learned the hard way with sticking with stock modem. Call quality was crap and battery life severly dimished with having a improper mix of modems and kernals. Since those mistakes I run continuum 4 with onix kernal 2.05 and jvk modem and have great batt life and call quality and download speeds are phenomenal. The best way I have found without going flash crazy is to see what the experienced people are using on their phones. The have it listed in their stats at the bottom of each posting they make. These people have been modding for awhile and know by experience what works best. Try that and you should have no problems getting the best combo for your captivate. Hope this answers your question. Good luck!
hsupa is over rated the phone already has hsdpa. hsupa may be good if you want to video chat or teather. but if you must get hspa in full you want to flash a different rom. no one has figured out a workaround for the brokn bluetooth calling with a rom/modem mismatch on a north american captivate rom.
as for the kernel, well i haven't tried an i9000 or i9010 or i9088 kernel on kb1 but they all should work. also i haven't tried changing the modem without changing the kernel but i believe that should also work. even if it is not recomended. i have never adhered to the notion that modems and kernels should match and had good luck with modems for t959d i9000m and i9088 on i9000 i9010 and i9088 kernels without major problems. it does seem that the older modems do not work all that great on the captivate with call volume or quality problems regardless of rom and kernel. but the kp1 from i9088 and kc1 from i9000 are both great on the captivate, i think i give kc1 the edge. if it weren't for those two and maybe others that i didn't try i would recomend leaving it all kb1 for the simple fact that a phone should make good phone calls.
the adage that the modem and kernel must match is true. ie. i9000 kernel/i9000 modem i897 kernel/i897 modem....it is absolutely true you must match those. if you use an i897 modem with an i9000 kernel or vice versa, you will have data but no voice. its not just a myth

[Q] does kernel matter?

Do you have to use specific kernels with certain custom roms? I am currently running andromeda 3 with ursa minor kernal. Can I just flash a new rom via clockwork mod without changing kernel?
Thanks!
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You just have to captivate kernel with captivate modem (unless reorinted i9000 kernel) and sam matchup with i9000 kernel/modem... If the rom is compatable by what I said then u can just flash the rom
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lad31der said:
Do you have to use specific kernels with certain custom roms? I am currently running andromeda 3 with ursa minor kernal. Can I just flash a new rom via clockwork mod without changing kernel?
Thanks!
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Click to expand...
Click to collapse
Tbh, I don't see why you would want to flash another rom using ursa minor. A3 + ursa minor go insanely well together (which is why they are in the ROM full flash). I believe you can use ursa minor on other froyo custom rom but I could be wrong (Adam, if you see this, please don't kill me if I'm wrong ) as A3 is I9010 based.
Other roms come with different kernel as the devs feel like they're the best/most stable to go along with their respective rom. So if you want the best experience trying a different one, I suggest you do a full flash (which includes rom, modem, kernel) and try them out that way. You can then decide if A3 (or any other) is more appropriated for you.
Just my though tho
I can vouch that. I need teh OC/UV.
Sent from my Captivate. Andromeda 3, Onix 2.0.5 @ 1.2Ghz
41LY45 said:
I can vouch that. I need teh OC/UV.
Sent from my Captivate. Andromeda 3, Onix 2.0.5 @ 1.2Ghz
Click to expand...
Click to collapse
lolol. It all comes to personnal preference/need
Thanks a lot! And as far as a3 goes, absolutely butter smooth!! I've been useing a dell streak for a while and flashing that vs this is night and day..
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Questions about Bootloaders, Kernels and Modems

I am new to Galaxy S but have had experience with roms, kernels and radios from a G1.
I started with Samsung 2.2 firmware and rooted it using Cyanogenmod wiki page and flashed the latest MIUI. I know kernels change speed and include Voodoo colours and sound for Galaxy S. I also now radios can change signal and gps accuracy.
1)Are modems the same as radios and if so where do I find a list of them?
2)What is the best bootloader and why does the Gingerbread one not have sd cards work? Also what else doesn't work?
3)How can I check which radio I have and if I flash any bootloaders how do I check that?
Radio, Modem and Baseband are all the same thing. You can check which one you have by going to Settings >About Phone and checking the Baseband Version.
A new modem is easy to flash as a zip file from Recovery and you can find lots of them by searching in the Dev forum, however make sure you flash a modem that is for CM7 since you have Miui installed. For guidence you can search for Modem in the Miui or CM7 thread in the Dev forum.
As for bootloader, there is no way to check which you have, but as you installed Miui directly over 2.2 you should have the froyo bootloaders. CM7 and Miui were designed for froyo bootloaders. Some people say that GB bootloaders have better battery life but if you have GB bootloaders with CM7 you can't access you external SD card and other things may not work properly. I would suggest staying with froyo loaders for now and seeing how it goes.
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I have read this:
http://forum.xda-developers.com/showpost.php?p=9579987&postcount=11945
but I don't know if it still JPP is the best radio as this was back in December. For people in the UK what would be the best overall radio?
can anyone answer me which is the best CM7 modem for ORANGE ROMANIA? tks
Try jvp or jpy, I'm on orange uk, insanity cm and they both work fine for me don't forget you need cm7 modem, there are 2 threads in dev for this
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About bootloaders
I have a SGS GT-I9000, and following
directions from ROM kitchen, I installed a Froyo 2.2.1 version.
It's I9000XXJPY with 2.6.32.9 [email protected] #22 kernel
and it says Rom kitchen v11.1-ZSJPK.
I wanted to install a Gingerbread version from ROM kitchen as well, but it says I have to make sure I have at least JVH bootloaders. Ummm, do I ? And what to do so i could install a gingerbread to my SGS ?
I installed a 2.2.1 froyo also from ROM kitchen I9000XXJVO with 2.6.32.9 [email protected] #22, build number XWJSD, hoping i'll install newer bootloaders with it.
But, i had problems with messaging so i'm gonna have to revert to previous one.
Do i have proper bootloaders or not and what could happen if i tried to install Gingerbread and don't have proper bootloaders.
Thanks in advance

CyanogenMod 10.1 + Semaphore 3.2 + Modem kk4 ?

hi all
is possible to use cyanogenmod 10.1.3
with semaphore kernel 3.2.0 and modem Radio-CM7-ICS-KK4-Captivate-signed.zip ??
I am interested in KK4 modem
CM10.1 is Android 4.2.2 based ROM, Semaphore 3.0.0c is the right kernel.
Default CM10.1 UGKG3 modem works well in most places, why you want to change it?
I see mobile data works better with KK4 modem, in my country.
OK, I never had to change a modem, so wait for someone with more experience to answer this question.
Thanks for your comment
Val D. said:
OK, I never had to change a modem, so wait for someone with more experience to answer this question.
Click to expand...
Click to collapse
besembel said:
Thanks for your comment
Click to expand...
Click to collapse
Changing modem is probably the most basic thing when it comes to flashing. Your ROM/kernel and bootloaders don't depend on it.
So flash away, you can flash whichever you want and as many times as you want, all it affects is your connectivity.
BWolf56 said:
Changing modem is probably the most basic thing when it comes to flashing. Your ROM/kernel and bootloaders don't depend on it.
So flash away, you can flash whichever you want and as many times as you want, all it affects is your connectivity.
Click to expand...
Click to collapse
Ok tanks, i test kk4 ICS modem.
I should mention that you gotta flash the right modems zips. I believe it's the I9000 zips for the cappy (unless it changed since i last used my cappy).
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I flash this file Radio-CM7-ICS-KK4-Captivate-signed.zip and works perfectly

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