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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15 views

How to kill or stop LMK daemon? (lmkd)

I'd like to kill low memory killer daemon(lmkd) to estimate swap performance of my smartphone. I tried these commands inside a rooted adb shell ps -ef | grep lmkd kill -9 $(lmkd_pid) However, lmkd ...
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how to enable BT_RFCOMM, HID, Injection, Nexmon features in my kernel? [closed]

I am trying to enable BT_RFCOMM, HID, Injection, Nexmon in menuconfig in my kernel source before compile it, but I don't know what these features is named to select them in menuconfig.
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Salvage Android Phone as Linux-Server (radio/wifi hardware broken)

My device has hardware problems with radio/wifi. Hence it's not possible to use sim-card or wifi. That also makes it restart frequently. Now it's useless as a phone. So I am trying to turn it in a ...
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Is it safe to turn off kernel panic in Android?

So I'm using a custom kernel that overclocked my CPU and GPU. I turned down the frequency to stock but the big cpu freq can't be set(restore itself to default after some time), causing my phone to ...
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Add more clock speeds

I know that the phone's kernel contains the clock speeds but is there a way to add your own clock speeds? What do I have to do to edit the kernel, where is the the clock speed data stored?
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How to process live sound output

I'm new to android and new to anything related to soundprocessing. The thing is, I have a simple deep learning model to eliminate noise (barking dogs, cars, ...). I want to apply (use) it to the sound ...
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Does turning off cpu cores will actually save power?

My phone is using custom kernel that has cpu hotplug in it. The hotplug name is AutoSMP and it has max cpu (big & little) core that should be online option in it. Currently I'm using 3 + 3 core ...
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Why does android has only one zram but linux distros use many zram equal to the number of cpu cores?

Most android roms have only one zram device [zram0] but linux distros use many zram like zram0, zram1 .... Why is it like that? Does using many zram consumes more power or adds complexity? what's the ...
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How to debug the kernel if the device only boot to fastboot [closed]

I am tring to compile the kernel source provided by the manufacture of my phone(OPPO PCCM00 precisely). Since it's not "well-opensourced", I changed quite a lot to make sure the kernel would ...
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What algorithm does Android used to translate touchscreen events to scancodes?

I have been debating someone recently about whether physical keyboards are faster than touchscreen keyboards. I have a lot of CS knowledge, but not a lot of Android knowledge. Therefore, during this ...
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Simulating WiFi device in emulator with mac80211_hwsim kernel module

I am looking to simulate an additional WiFi device in a rooted android emulator (to simulate a device my company makes). So far I have found the linux kernel module, mac80211_hwsim, which seems like ...
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syslog shows a bunch of FF messages

When I run dmesg I see a bunch of these errors, FF SUSPEND INT 0 ?\x09 FF WAKEUP 0 ?\x09 FF GAD SUS 0 ?\x09 What do these mean? Is this ...
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Kernel flash fails with “Dumping/splitting image failed. Aborting…”

I compiled this kernel for my OnePlus5T. After that, I packaged it with AnyKernel3 (I'm getting "Dumping/splitting image failed. Aborting..."). anykernel.sh # AnyKernel3 Ramdisk Mod Script # ...
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What is the most stable kernel for my ALE-L21 (2015) alice and ROM?

I'm pretty sure that this is already a weak legacy device but I want it to be useful and stable in performance to the max. Can you suggest the ultimate kernel for my 7.1.2 AOSP based custom ROM? Note:...
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How do I redirect speaker output to microphone input for a Redmi Note 4?

I have a Redmi Note 4 android device and I have installed LineageOS 16.0. The phone is rooted. I want to redirect the speaker output to the microphone. Could you please suggest the change required in /...
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How can I tweak my kernel to use all CPUs in my rooted device?

I have Huawei ALE-L21 alice (2015) Magisk-rooted Bootloader-Unlocked Xposed-Installed but it's somehow slower and I decided to tweak my CPU but here is what ES Kernel Manager shows: Also, I can't ...
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android's linux kernel scheduling mechanism vs harmony os's deterministic latency engine

I was reading upon Harmony OS and found that android's Linux kernel scheduling mechanism has some limitations as mentioned here: https://harmonyosofficial.com/ From Harmony OS website mentioned above: ...
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Android Boot Logs Before Logo

BTW, I am wanting to know what Android Boot Logs come before the Android Boot Logo. I see an Android Boot Logo, and I have to hold the power button, but what does it show in the boot logs in the ...
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1k views

Default kernel version of Android-x86 ISO

I know that android-x86[...]-k49.iso means it is using kernel version 4.9, but for some ISO like android-x86[...]-r4.iso, the kernel version is not mentioned. Since 64-bit isn't booting for me, it ...
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Linux Deploy Ubuntu share folder

I wasn't sure if I had to ask this question on a Linux Exchange or on the Android one, but since folder sharing is working fine on the Linux that are running on my computer, I thought that it is an ...
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1answer
107 views

Galaxy S7EDGE Random Reboots

Two months back from now I installed LightROM oreo, it was fine then but after two months it started to get slow. So I decided to flash pie or Q rom, but from my previous experience whenever I install ...
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2k views

How to make Ethernet work on Android over OTG?

I am trying to use an LTE modem connected to an Android 7 device over an OTG cable. The kernel recognizes the device and registers it with cdc_ether, but I am unable to use the connection from the ...
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Nexus 7 (2012 Wifi) Custom kernel bootloop [closed]

I trying to build custom kernel for my Nexus 7 (2012 Wifi) device. Changed few things builded successfull, no bootloop. But I enable this in menuconfig: Device Drivers -> Network device support -> ...
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How do I change the Battery Percentage that corresponds to a Voltage in Android

My original Li-ion has 3000 mAh capacity. I've modded my device to have a total of 7000 mAh capacity now. The enhanced capacity means that my percentage is not displayed accurately anymore. About ...
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How to force SELinux to permissive even when setenforce 0 is not working and kernel was 100% permissive when flashed?

I don't know what to do, I'm using Samsung Note 3 (Exynos) - N900 with custom Resurrection Remix 5.8.5 ROM (Android 7.1.2) with it's own permissive kernel and rooted with Magisk. Yesterday it turned ...
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Unable to take kernel logs on a non-rooted device [duplicate]

I am trying to take kernel logs but so far have only got errors like 'permission denied', 'path does not exist' or 'kernel log does not exist'. I have tried this kernel panic link, this crash logs ...
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How to make the kernel to also check termux bin folders

How can i make android kernel to always check termux binary folder for some binaries assuming they are not found in /system/bin ? I tried copying those binaries from termux bin folder into /system/bin ...
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327 views

Use AOSP generated boot.img with Android 10 factory images

Is there a way to use a boot.img generated by AOSP sources with factory images of lets say sailfish (Google Pixel)? I used to do this in the past, but now this results into a bootloop. logcat haven't ...
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PIO CLI support for normal Android

Question is simple, is it possible to integrate PIO CLI tool to normal AOSP project for cellular device? According to my current knowledge Android Things OS is not open sourced, at least not ...
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1answer
49 views

What feature of Android provide security to reset the /system changes on reboot?

I am stuck in a weird situation where I have two Android 10 phones from Samsung. I have rooted the stock recovery of both device as instructions given here. The problem is when I change something via ...
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Recompile kernel: no errors but it doesn't work

I'm a beginner, and at the moment I'm trying just to repack original boot image. I've discovered that boot partition is on the "/dev/block/mmcblk0p7", so I pulled it with adb pull /dev/block/mmcblk0p7 ...
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How to add a simple file on /system without actually modifying it but with using kernel sources? [closed]

From the time system-as-root came, developers have rooted different devices by patching the Magisk su binaries in the kernel. I want to understand how exactly they have done this so to start from ...
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943 views

How can I lock device on a particular network frequency using android kernel sources?

Motivation My goal is to select or lock LTE frequency bands on mobile devices with Qualcomm chipset. On some devices like Samsung Galaxy S5, we can access hidden menu: *#2263# to select the radio ...
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1answer
887 views

What is needed to run ELF binaries compiled from android APKs? (understanding android internals)

I'm trying to understand how Android works internally. Before ART, it used Dalvik to run java code. I guess it created a Dalkiv process in 'Linux' kernel which was simply a VM that ran the dex ...
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603 views

there is an internal problem with your device

When I install my custom kernel i got this message after reboot. The phone working normal no kernel panic or etc. system/build.prop vendor/build.prop
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SELinux permissive kernel - is it a security risk?

As in title. I am talking of Kernel, not ROM (plenty of questions dealing with ROM on this site). I have a OnePlus 7 running stock Android 10 and prefer a custom kernel. Of late, OnePlus hasn't ...
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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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908 views

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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817 views

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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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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1answer
2k 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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124 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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509 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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173 views

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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414 views

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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1answer
941 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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560 views

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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379 views

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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1answer
6k 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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71 views

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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