The kernel is a central component of most computer operating systems. It acts as bridge between applications and the hardware and also manages the systems's resources.

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How can I backup and restore Cyanogenmod 12.1 rom installed on my Samsung Galaxy 2 i9100?

Cyanogenmod(12.1)'s recovery has no backup or restore option. As I read in the answer of a previous post, CyanogenMod recovery is basic, so we should flash another recovery. The easiest way would be ...
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set pr_set_dumpable value to any apk on android device

I am trying to debug sigsegv errors in different apk files and found that many apps disable dumping the logs by setting prctl(pr_set_dumpable,0). Is there any way to get around this and get the ...
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36 views

How to modify appsbl

I want to modify the appsbl partition for my device, I know the danger but I want to learn how to unpack and repack it. What method and tools can I use ?
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2answers
91 views

Why one cannot download the drivers of the Android OS like we do in our pc's

I know that i sound kind of a noob but i had this question from the day i started tweaking my phone .I know that without kernel sources it is very hard to get drivers for the phone for the sake of ...
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43 views

Devices names from android system

for several days I'm trying to find devices ( accelerometer, g-sensor etc ) names and placement of theirs drivers? I'm new to android and linux and can't figure out where can I find this info. I was ...
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Why does the Kernel and Android System/Android OS drain my battery?

3 hours since unplugging my phone, and at light usage it's at 61%. It is the kind of problem I've had with my previous phone, and I have with my current phone, often starting a few months in and ...
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1answer
87 views

What does it mean if I can't find a kernel date?

I want to root my ZTE Grand X Max and it asks if the kernel date is before or after a specific date but when I go and look is has no date by the kernel version (3.4.0). What does that mean? Or do I ...
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169 views

What is the Despair kernal for Nexus 5 and 6?

I'm rooting my nexus 5 with android m and it asks me to install Despair Kernel. I can't find any info on what does the despair kernel actually do. Is it safe? What improvements does it have vs stock ...
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93 views

Device file for USB controller/joystick not created

I've got an Android 4.1.2 device (OUYA) and a PSX-USB-Adapter with two Playstation controllers attached. Attaching it to the USB port makes the device show up in dmesg: <6>[ 331.002934] usb 2-...
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522 views

How to decompile android kernel within android itself?

How do I decompile kernel.bin of my android 4.1.2 kernel on android itself? Is there an app that can decompile kernel.bin or any methods for decompiling kernel.bin? Thank in advance!
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58 views

Is it possible to compleately and utterly brick a phone with no chance of repair?

As i have recently gotten into some research about android kernel development and would like to fiddle around my phone and of course i have seen all the warnings about "bricking your device" but it ...
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65 views

Will updating the kernel reset the phone memory?

I updated my OnePlus One phone to the company-owned system, Oxygen OS. The battery now is miserable - it depletes within 5 hours. I am looking for a solution to fix that without wiping and ...
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22 views

RCA tablet want to watch on monitor

I have an inexpensive tablet (RCA), and I want to hook it up to a monitor with a VGA hookup, I got the adaptor, micro USB on one side and VGA on the other. Hooked it all up, and nothing....I can't ...
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151 views

Is there any kernel requirement for installing Android Lollipop?

Is there a special requirement for a newer kernel in Android Lollipop? Can I use it with 3.4 kernel?
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1answer
2k views

How do I mount an NFS share on an CM 12?

I'd like to mount an NFS share on my Android cell phone, with perhaps a mount-unmount button on the home screen. Any ideas of how to accomplish this? My /system/lib/modules is empty. It doesn't have ...
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140 views

Is “Host GPU on” on android emulator same as GPU passthrough?

I see that there's "Host GPU on" for standard Android emulator(which is incidentally qemu-based) from Google. Is it same as the hardware acceleration obtained by successful GPU-passthrough in Qemu-kvm?...
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1answer
43 views

What do you mean by kernel [duplicate]

I have many times come across this word. I even know a little about it but don't know exactly what it is.
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2answers
247 views

Stuck at boot screen after adding multi-user account

I attempted to add a multi-user account to my device, and after it automatically restarted, it has been stuck in the boot loading sequence. I tried un plugging it and running over night, it simply ran ...
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1answer
594 views

Enable framebuffer console in Android kernel source

Is it possible to somehow enable the framebuffer console in android kernel sources from samsung, to see kernel messages instead of just the bootlogo?
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5k views

Swap to Increase RAM but kernel issue

I have Micromax Canvas Doodle A111 phone with Android v4.1.2. My phone has 512 MB RAM by default. So whenever I try installing some new apps my phone becomes really slow so I decided to increase RAM ...
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1answer
79 views

Nexus 4 rooted, stuck at CM10 for various reasons - HELP!

I've been using a Nexus 4 for almost 2 years now. I rooted it to get LTE connection. Downgraded radio and all... it was beyond my level of expertise but I managed to get LTE and CM10, along with a ...
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1answer
866 views

Powered USB hub not charging phone. Kernel options?

I got a powered USB 2.0 hub (ET-UP900). As power source I am using the phones charger. But if I connect the hub with my phone (SM-C115) it does not charge. If I connect the charger directly it works. ...
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1answer
134 views

Is android kernel same for all devices [closed]

I m newbie to building roms. I have Hiawei G630 device with 4.3 kernel. My question is would it work if I use Samsung or other Huawei kernel. Sorry form my bad english
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1answer
2k views

Screen flickering galaxy s3

I noticed that my galaxy s3 sometimes show flickering on display when I am for example closing apps. I disabled HW overlays but it didn't help. I read that it can cause battery. My battery is fairly ...
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1answer
2k views

usb to ethernet driver installation

I am following this thread to enable my samsung android phone to do usb to ethernet communication http://forum.xda-developers.com/showthread.php?t=2039886 I copied the smsc75xx.ko generated by the ...
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1answer
656 views

how to find out secret service codes for android

I have a Spice Dream Uno (Android One) and none of the secret service codes I found on the internet (like ##197328640## and ##7378423##) work on it. Do I have to root my phone in order for these to ...
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1k views

bootloops / random restarts on Note 2 LTE, worse with SIM inserted? analyze kernel log “last_kmsg”?

when I started using my Note 2 LTE with an LTE sim card (tested LTE long ago without problems), running CM11 nightly from approx. 1 month ago, it started to reboot randomly. But it also happened with ...
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1answer
2k views

Can one determine the kernel version of a Samsung device from the Android version?

Basically, does an Android version map to a specific kernel version on Samsung devices? For example, can I assume that Samsung devices running Android 4.4.2 will have kernel version 3.4.0 (or some ...
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179 views

Automatic turning on an android

i have found a solution of the problem of automatic turning on an android (not samsung), when battery is charging for this i've inserting the line /system/bin/reboot in the file /system/bin/ipod ...
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1answer
2k views

What does “se.infra@SEP-138#1” mean on kernel version?

I have broken my mobile, so I want to download the original version back. The original version is: Android version: 4.1.2 Kernel version: 3.0.31-638230 se.infra@SEP138#1 On kernel version, what ...
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514 views

Any Fast Charge Kernel for Nexus 7 grouper? Franco Kernel?

I have the latest Franco kernel on my N7 2012 WiFi, normally it should be able to fast charge but I cant? Anyone have a solution or another kernel supporting fast charge for my device? This wont ...
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6k views

Extracting code from lk.bin (little kernel binary file) & preloader.bin - MTK6572, mediatek

This is a changed question from the original, since nobody seemed to have answered, found most of the answer on my own. As stated before, wanted to fix my userdata and fat area blocks after hacking ...
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1answer
633 views

Trying to replace a modem but encountering errors

I've been having connectivity problems on my i9505 LTE on every ROM I've tried since August. Searching around reveals that the outdated modem is the source of the troubles, and that by using the ...
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1answer
266 views

What does it mean by letter 'g' in a kernel version string such as 3.4.0-gd59db4e?

In my Nexus 5 device, I can see the kernel version as follows: 3.4.0-gd59db4e I know 3.4.0 is the linux kernel version number, and d59db4e is short of a commit sha1. here is another example. I just ...
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1answer
250 views

Is Android FAT / FAT32 implementation power failure resilient?

Does the android FAT/32 implementation handle sudden battery removal? I know that Symbian's 'Rugged FAT' (efat32.fsy) and Microsoft's T-Fat implement this, but I've not been able to find any ...
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1answer
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AFwall+: Why does the Kernel need an internet connection all the time?

Since I started using AFWall+ (a firewall based on iptables) on Android, I was wondering why the Linux kernel tries to connect to the internet all the time? Allthough blocking the kernel I didn't ...
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does flashing a kernel ever wipe anything on the phone? + Doing it without CWM?

does flashing a kernel ever wipe anything on the phone? and is it ever dependent on android version? e.g. 4.22 or 4.3 I have CWM and i've seen the option to install from zip within CWM recovery. ...
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1answer
97 views

Using a wifi dongle to monitor network

I have an android smart box with a built-in wifi and I want to add a dongle to the box so that I can monitor the network. I have found a similar question with somewhat vague answer(at least to me); ...
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1answer
1k views

Programmatically, how does “rooting” a device enable access? [duplicate]

From a layman point of view, one would say, "Oh, I'm unrooted so I am blocked and access is not allowed." I want the programmatic point of view; telling me how an unrooted device doesn't have access ...
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1answer
3k views

Network Issue after flashing Cosmic ROM at Galaxy S Duos

I am a Galaxy S DUOS S7562 user and I have flashed Cosmic ROM v2.5 to my phone. However, I face some connectivity problems. My phone is dual sim but now it forever activates and deactivates both sims ...
0
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1answer
560 views

How do you extract the boot.img from a samsung g4?

I don't image the adb command is able to access that sector of the device but for the record, when I connect, I can see the device but C:\Users\Brad2\Downloads\adbUnzip2Cdrive\adb>adb kill-server C:\...
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1answer
551 views

Where is the .config hidden on Samsung Galaxy S4?

cat /proc/config.gz tmp-mksh: cat: /proc/config.gz: No such file or directory Is there another place to find it?
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1answer
438 views

Help to understand working of powerbutton and volume rockers

I want to understand the workings of power button and volume rockers in Android devices, which are associated with the kernel driver of these keys. What happens in the kernel driver and boot loader ...
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1answer
102 views

Proprietary software distributed along with Linux kernel

What is the licensing rationale behind distributing proprietary (copyrighted) software within a common smartphone's Android system? I mean software like device drivers (camera, GSM modules etc.) or ...
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1answer
814 views

Confirming the nature of a Samsung update, and declining it

I find it a little bit offensive to receive a "Software Update" message on my Galaxy Note 2 that does not disclose the nature of the update (an OS update? an app update?). software update message (...
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1answer
734 views

Oddities Reading boot.img - Way Too Big and Errors In Kernel

This is related to this question but as I've made some progress since and run into some rather different issues that would mean I'd essentially have to rewrite it to be a totally different question I'...
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1answer
779 views

Is it possible to unload built-in kernel module?

I have a kernel with built-in module that I want to replace. I have built a .ko and tried to insmod it, but it failed since the kernel was already built with it. Is it possible to do this?
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1answer
68 views

Replacing the system partition without touching the kernel?

So I have an android phone that I'd like to put a clean rom onto, but it looks like there aren't any good kernels ported to it yet. I've done some reading into the android architecture, and come to ...
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1answer
703 views

How to install custom kernel from source? - Galaxy Tab 2 10.1 (GT-P5113)

I have modified the kernel code in attempts to add a driver for USB to Ethernet. I have successfully compiled the code and am trying to install it onto my tablet. I am following the README that came ...
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1answer
594 views

Where is the current_now measurement generated

If you go into the adb shell, you can check what the amount of current the battery is discharging by using the following command cat /sys/class/power_supply/battery/current_now When the current is ...