Questions tagged [kernel]

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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Custom Android OS/Rom with Advanced Security Protection [Development Help Needed] [closed]

Hello Everyone So I was wondering (I've searched the internet and various websites,with no luck finding what I need) Requirements: I would like to customize and build the Android OS for my mobile ...
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How to increase the sample rate of the current measured from the Android kernel?

I need to monitor some applications power consumption of my Samsung A8, programmatically. I'm doing this by accessing the files: /sys/class/power_supply/battery/current_now /sys/class/power_supply/...
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How to capture kernel panic logs when ROM failed to flash?

Background: Stuck in boot-loop when unpack and pack system.img? Short Description: I am trying to modify the system partition of my Samsung S10 5G system-as-root treble device. I have successfully ...
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How can /proc/sys values be changed at boot (sysctl.conf does this on normal Linuxes)?

How can /proc/sys values be changed at boot? sysctl.conf doesn't exist on Android and echoing values to the proc files isn't persistent.
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273 views

SELinux always set to permissive, how to set enforcing permanently?

I flash a custom ROM to my HTC B2UL. The ROM, by default, has the SELinux policy set to Permissive instead of Enforcing. I can use adb shell setenforce 1 to make SElinux enforcing. But after reboot, ...
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297 views

How to edit root files in /sys (Permission Denied)?

I have been trying to change root files in my phone through an app I am developing. The phone I have is a Moto G6, fully rooted. I'm using terminal emulators to run commands on my phone. I've tried "...
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21 views

How to view device kernel information (verbose)?

I need to view my device kernel info, in particular the architectures. The device is not rooted, therefore uname command isn't available in local terminal, but cat /proc/version doesn't have an ...
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83 views

How to install a 64bit gsi

I know, to some people, this question may seem illogical, but I have tried every possible solution available. I want to flash a 64 bit AOSP phusson's GSI in my Redmi S2, which has stock 32 bit OS, ...
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Phone only charging in offline charging (when powered off) Moto X play

I'm struggling with this issue for about two months now. ISSUE Phone, when on slowly charge to around 65% (rarely reaches 100%). Around +10%/h. Ampere reports battery overheat, when it's 25-32 C. On ...
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Is it possible to add a driver to my kernel without flashing a new kernel? [duplicate]

Is it possible to load a driver as a kernel module into my Galaxy S10, Magisk rooted without having to build a new kernel and flash it?
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Why does go_hispeedfrequency gets to 1.4Ghz even when I set to 648 mhz?

Using ElementalX kernel manager,stock android 8.1 and on ElementalX kernel.In interactive governor option,to save power I put the settings but it changes and also boost becomes 1 from 0 every time.
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Using wlan1 instead of wlan0 in Android Nexus 6

I am trying to use a WiFi dongle with Android Nexus 6 with custom ROM and kernel. I have installed drivers of USB WiFi dongle on Android phone that appears at wlan1 network interface in adb shell. ...
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Making external wifi adapter work on Android

I am having a problem understanding what options I have to use my external wifi adapter, TL WN722N, on my Android Phone. I am using a galaxy s10+, rooted with magisk, no custom recovery/kernel. My ...
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209 views

How to load kernel module with Magisk root but without custom kernel?

I am having a really hard time finding anything about this on Google which is not from 2011. I have a Samsung Galaxy S10+. I have rooted it with Magisk without TWRP, i.e. no custom recovery or custom ...
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USB OTG not showing WiFi network even after drivers are installed in Android kernel

I am trying to connect to WiFi using a USB WiFi stick by making use of OTG on my Android Nexus 6. The USB WiFi stick has a separate AP. However, I am unable to see this AP in the list of available ...
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Is it a Kernel or a ROM that provides power_supply battery files?

Long story short I was installing custom ROMs to my Android device and one thing that stays in place regardless of ROM I use is a wrong battery stats monitoring. The device always behaves like it's ...
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668 views

How can I enable last_kmsg?

I'm trying to diagnose a random reboot on LineageOS 14. last_kmsg is not in /proc, nor it is in /sys/fs/pstore/console-ramoops. EDIT: ~# mount | grep PSTORE ~# mkdir /mnt/pstore && mount ...
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How can i recognize what kind of wifi SoC that my phone using?

How can i recognize what kind of wifi SoC that my android smart phone using? etc bcm... and my smart phone can not access in dmesg. ㅜㅜ
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Flashing andriod roms and kernals

If you have rooted an android phone and flashed a different kernel can you just flash over another rom or will it brick your phone. Is it necessary to go back to a google factory rom before you ...
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Update Remix kernel from Androidx86

I have installed new gtx 1050 gpu. But its not supported by remix os. But it is supported by Androidx86. And phoenix os is still buggy. I read about updating on xda. But its breaking the os. Can any ...
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441 views

where kernel modules are installed?

I am trying to find Linux kernel modules on my nitrogen board. I have unpacked kernel config from /proc/config.gz and I see kernel was compiled with a lot of modules. I see only one in /vendor/lib/...
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254 views

Dirty Flash Android Kernel

Will it be an issue if I dirty flash android kernel? I am trying out a few kernels for my phone and I want to make sure that dirty flashing won't affect the efficiency of the kernel. If it does, what ...
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265 views

Why files/directories under Android's root filesystem don't change across different version updates?

I compared 2 devices; one running Android v5.1.1 and other v9.0. So I noticed that files under /proc are same in both. Can anyone explain why there is no difference even though OEM's are different and ...
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Xperia Z1 freezes and reboots

I know that this is bug in Stock Lolipop 5.1.1, still i haven't collected any kernel logs because when i need root i just use custom roms, because they are more flexible and there i don't have that ...
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107 views

What position do cellular communcation (1G, 2G, 3G, 4G or other function only implemented in phone) play in Android operating system archtecture?

I am entirely new to Android, but have a little knowledge on Linux. I have view the architecture graph of android on official site: The Problem: Not all android device support cellar network. As a ...
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Can't use adb after phone startup until unplug/replug USB cable on Galaxy S3

I am doing some Android kernel development and would like to be able to quickly flash a kernel and reboot my phone to test my changes. Unfortunately, whenever my phone starts up, I can't access the ...
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181 views

How to install Kernel Driver

https://android.googlesource.com/kernel/msm/+/android-7.1.0_r0.2/drivers/hid/hid-huion.c I want to install the driver linked above. How should I do it? I'm running on a custom rom so do I tamper with ...
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154 views

How do I load an unsigned Kernel Module to my signature enforcing Kernel?

I compiled a kernel module (wacom.ko) using the proper kernel source for my device and Google toolchain. When I tried to insmod the module, an error message popped up saying required keys not ...
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487 views

Should Android kernel version date match the release date?

In the process of checking the settings on my Sony Xperia XA I came across the Linux Kernel information. Version 3.18.35 was released in June 2016 but the date shown is from 2017: 3.18.35+ BuildUser@...
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854 views

Android OS (Phoenix OS) restarts when i insert headphone in 3.5mm jack

What I have tried: I have tried USB earphones and mic, both works perfectly, So it should not be Sound/Audio issue in Android. If I keep earphones plugged in during boot, PC shuts down at "...
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How to disable sensors on-demand to reduce power consumption?

Nowadays, any Android device has a big sensor amount implemented. It is true that most of the sensors do not require a considerable amount of power for their operation. But the sum of the power ...
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431 views

Where to find information about WiFi connectivity of the device?

is there a way I can find information about my device's connectivity to WiFi network? I need information like: what network I'm connected too, what is the mac address of the router, how long have I ...
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1answer
60 views

bind mount / symlink - keep destination “tree” on removal of source?

I'm trying to accomplish something fairly odd, so bear with me. I've added an external SD card to my old Droid Mini (basically just for an experiment to see whether or not I could expand the storage ...
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3k views

Backup/dump kernel image (and full ROM) without root for Mediatek Devices

I would like to pull the boot image of my device Pipo N7. I don't have root. I found the following link: Backup/dump kernel image without root or twrp/cwm` But when I try to find /dev -name 'by-name'...
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249 views

Are android system kernel panic logs available in TWRP recovery?

I am trying to debug a rom I built but can't seem to find the any kernel panic or system logs in TWRP recovery. Is it possible to create logs for a failed boot to see whats going wrong? I am still ...
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223 views

Permission Denied on injected /sbin Scripts

I have an android device.. and Honor View 10... L04 version (US). I have a set of tweaks I am injecting into my kernels ramdisk, that all fire off without issue when I adb shell in and manually run ...
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395 views

Possible to patch the Android kernel with root?

Basically there's a boot rom exploit on Tegra X1 chips, specifically the Nintendo Switch that allows you send payloads while it is in Recovery Mode and basically run unsigned code (homebrew, custom ...
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Linux kernel 4.4 Android devices

I am trying to find out what all devices are running linux kernel 4.4+ and having a hard time finding all. Till now I could only find Sony Xperia devices running kernel 4.4. The reason I was trying ...
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208 views

How can I disable the GPS functionality from my android phone at the kernel level?

How can I disable the GPS functionality from my android phone at the kernel level? I know this requires (though not sure) disabling either device drivers for GPS or kernel module BUT how to do it ...
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How do I get a version of Android with linux kernel >= 3.18 on a Nexus 5?

According to this post Android 7.1 has kernel 4.1.1 and Android 6.0 has kernel 3.18.10. I installed Android 6.0 on a Nexus 5 (using the latest google image) and ended up with kernel 3.4. Then I ...
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Build kernel module on locked bootloader [closed]

I have an device with locked bootloader, but i have the kernel source and prebuilt kernel. I have two questions: Do i need the kernel to be built to get a module working? Can i get an module to be ...
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Write protection of loop device // Read-Only Filesystem

After spending days on that topic I am in need of additional ideas ;) Facts: MTK6757 / Android 7 / Kernel 4.4.15 / FS EXT4 (No F2FS) / Working Root I have a fresh and clean 64MB EXT4 .IMG File in /...
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Is android kernel a microkernel or a monolithic kernel?

Since the android kernel is derived from the mainstream Linux kernel, with additional drivers for a specific android device. is it safe to say that the Android kernel is also a monolithic kernel? But ...
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“Could not do normal boot invalid kernel length”

My G935F shows "Could not do normal boot invalid kernel length" when attempting to boot into TWRP or turn on the device normally. The only thing I can access is ODIN. This happened after attempting to ...
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1answer
161 views

How to add support to an external monitor in Android?

My Samsung Dex (with Android 7 in a Samsung Galaxy S8 phone) won't work with my LG 23MT75D-PU monitor. I think because the Android driver are not ready to talk with this monitor yet. I will want to ...
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554 views

How to brick android

I'm currently trying to hard-brick my phone. Yes, you read right. The reason doesn't really matter. I tried flashing wrong recovery/ROM but no success. I could easily recover the smartphone afterwards ...
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62 views

login error into POS software

I have downloaded Yalp Store successfully. It seems to be working, but I'm unable to log in into one of the software I downloaded. Do you know what this means... "Not allowed to start service intent [...
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639 views

Unfortunately, Google Play services has stopped?

I recently bough an Android computer from China. However, it does not have Google Play Store on it. I've tried downloading and installing the Google Play APK. The installation appears to be successful,...
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265 views

As of current versions, would any of these setups pass safetynet checks?

Would these pass? OP3T + LineageOS + Kernel that doesn't show bootloader unlocked status? and also OP3T + LineageOS + Kernel that doesn't show bootloader unlocked status + Magisk? I'm currently on ...
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2k views

Booting kernel from fastboot

We all have heard of "fastboot boot xxxx" command. How does it work when you use it for kernel (fastboot boot boot.img)? Is it simple as this: it boot Android with that kernel if possible or it make ...