This tag is for questions about the internals of the Linux kernel itself - particularly about use or configuration of kernel modules or drivers.

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ACPI doesn`t work properly?

My PC with next parameters H/W path Device Class Description =================================================== system P5K PRO (To Be Filled By ...
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0answers
18 views

Linux: Why UID and GID are 0 despite not being the root user?

Just a question here. I was looking through my program and its pid, uid, gid. And I found UID and GID are 0 but I'm not signed in as a root user. Why is this the case? And I am curious if UID and ...
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3answers
14 views

How to launch vmlinuz-linux from efi shell?

How to start vmlinuz-linux from efi shell ? I jump into the ESP and type vmlinuz-linux (vmlinuz-linux is in the ESP) but it says vmlinuz-linux isn't recognized as an internal or external command, ...
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0answers
69 views

Kernel 4.4.1-1 fails to boot - root volume “does not exist” - 3.10.0.327 and 4.3.3-1 both continue to boot fine

I'm trying to install and boot kernel-ml (currently 4.4.1-1) on RHEL 7.2 following the instructions here: http://linuxg.net/install-kernel-4-x-on-enterprise-linux-7-centos-7-and-rhel-7/ Install works ...
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2answers
4k views

How do I stop rfkill module from hardblocking my wifi, without rfkill command?

I went into my BIOS the other day, didn't change anything, and rebooted. After this, my wifi was hardblocked. I looked online for solutions, and learned of the rfkill command. But I get rfkill: ...
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0answers
10 views

How to Disable Linux kernel tracer

I have installed Ubuntu 12.04 (32bit). The current tracer is set as nop. cat current_tracer nop cat tracing_on 0 Although the current tracer is nop and tracing is disabled, all these following ...
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5answers
2k views

Does linux have any measures to protect against fork bombs?

#include <unistd.h> int main(int argc, char* argv[]) { while(1) { fork(); } } I run this program on my linux, nothing outputs on the terminal, the OS seems go dead. Does linux have ...
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1answer
31 views

Virtual machine running a *newer* linux kernel?

Is it possible to, for example, have the main system be Ubuntu 15.04 and install a virtual box that runs Ubuntu 15.10 inside of it? Or does the host system have to have a Linux kernel that is at least ...
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0answers
20 views

Cannot find root device when loading a new kernel image

I am trying to install an old linux kernel image 2.6.32.69 just for learning purposes. The machine is ubuntu 15.10 32 bit. The commands to build kernel are: make oldconfig make bzImage make modules ...
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1answer
3k views

What do these error messages mean and how to fix it?

============================================================== actually I figured out this is an issue of intel video driver:http://lkml.indiana.edu/hypermail/linux/kernel/0902.3/01703.html ...
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1answer
75 views

Hairpinning in Linux

I have a router in which I installed a Linux system. I want my router to support NAT hairpinning. Does a such feature exists in Kernel Linux? If yes how to activate it? Are there a patch to apply it ...
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0answers
24 views

Java unable to create new native thread with kernel 4.3.3

I'm a Java developer using Arch Linux. The application I'm developing on consumes a large amount of memory (around 4.5 GBs) and uses java version 1.6.0_37. After I upgraded to kernel 4.3.3 I get the ...
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1answer
2k views

linux; return “RTNETLINK answers: Operation not supported” for dummy interface creation

I am trying to create a L3 interface in kernel v3.4.34, that is not attached to a physical interface/device and this is to be used purely as a management interface as an externally visible interface ...
1
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1answer
96 views

sd card not detected at all in linux

My SD card reader is not detecting any SD card. There is no output from dmesg when an SD card is inserted. df does not detect anything and also nothing in fdisk -l. Does linux support SD cards? I ...
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0answers
68 views

How do I fix Manjaro error hibernation device not found on boot?

After installing updates and restarting I got these errors. ERROR: resume: hibernation device 'UUID=long number here' not found ERROR: device '/dev/mapper/ManjaroVG-ManjaroRoot' not found. Skipping ...
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2answers
86 views

kworker is running modprobe every second

Using fatrace, I discovered that on my computer, modprobe runs approximately every second. To find out why, I replaced modprobe temporarily with this script: #!/bin/bash echo "$0" "$@" > ...
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0answers
15 views

Run X window system with CONFIG_VT=n in linux

I have an Arm device that I installed Gnu/Linux on. Unfortunately the full source tree to linux with the patches required to make it work on is not available. There is a close version to the source ...
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2answers
452 views

How to install kernel rc rawhide in Fedora?

I am new to Fedora and I decided to try it on my new laptop instead of Ubuntu. I have an XPS 13 (9343) and the sound is not working. I researched online and found out that people had success ...
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0answers
20 views

Freeze when starting Windriver os

When I start Windriver OS, it always freeze. And it shows this text in console window: acpid: 0 rules loaded <br> acpid: waiting for events <br> Starting advanced configuration and power ...
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2answers
398 views

Free space in /boot partition with dependency loop

Summarising my problem is that my /boot partition is almost full but I can't free it up due some dependencies loop. Detailed description: I am running a Ubuntu 14.04.2 LTS which has the /boot ...
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2answers
6k views

Booting linux without bootloader

I installed Ubuntu-Server in Oracle Virtual Machine and it failed grub install step. At the end of install it gave me a message: You need to manually boot linux /vmlinuz kernel on partition /dev/sda1 ...
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0answers
134 views

My own linux corded keyboard driver and interface to my embedded application

I want to develop my own keyboard driver to my own keypad. I have to use GPIO to identify Key Events and use I2c to get scan code. I am going to develop the driver like this. #include ...
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0answers
102 views

linux bluetooth firmware missing

The kernel is trying to load a bluetooth firmware version that does not exists. dmesg: [ 4.435796] Bluetooth: hci0: read Intel version: 370810011001140d00 [ 4.436742] bluetooth hci0: Direct ...
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2answers
67 views

What is the exact different between Linux kernel release and version? [duplicate]

In Linux based operating system we can find Kernel release and Kernel version. So what is the exact different between Release and Version ?
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1answer
17k views

Where can I find the Linux kernel file?

Is there any common directory to find kernel file in all Linux distributions?if yes please tell me how to browse to the directory? Where can I find the Linux file in Ubuntu & RedHat operating ...
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0answers
17 views

How to get config from a EFISTUB kernel?

I am working on getting normal Linux onto a x86 Android tablet. Only kernel I can find is efilinux.efi located inside the system’s ESP (\EFI\Intel\efilinux.efi). But I can’t get config through these ...
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0answers
215 views

How to upgrade kernel in Ubuntu 14.04?

I want to use Docker on my Linux server for which I need to upgrade the kernel to 3.10 or higher. So following this answer I was trying sudo apt-get install linux-generic-lts-trusty, which results in: ...
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0answers
38 views

Disable kernel module loading on custom initramfs.igz

my machine, which runs GNU/Funtoo Linux on one of the 2 raid0 arrays it has, needs an initramfs with dmraid support to boot into the system. During the last 7 years i've been using a custom initramfs ...
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0answers
33 views

Why WiFi drivers carry firmware with them?

Why do linux kernel modules for wireless LANs have 'device firmware'accompanying them while other driver modules don't seem to carry a copy of the firmware with them? Edit: I've been informed that ...
3
votes
1answer
80 views

Why is USB Serial so fast in linux?

I've just started using a 3G modem on a RaspberryPi using the "stock" USB Serial driver from the linux kernel (as indicated in the modem documentation). Once the modem was recognized and appeared as a ...
3
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2answers
40 views

Does Installing a driver increase linux kernel memory footprint?

I have read that linux kernel is monolithic kernel and it contains drivers within it, in a single file. For example, I have two linux kernels 3.16.0.40 and 3.16.0.50 Currently booted system with ...
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1answer
734 views

Problems installing VMware on arch linux

I'm trying to install VMware but when it gets to "before you can run VMware, several modules must be compiled and loaded into the running kernel" I click install, enter my password, and i get a error ...
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0answers
21 views

User-mode Linux aborts on start

I am attempting to test a modified linux kernel by booting it with UML. I was able to build the kernel without a problem, but when I try to start the built kernel with UML, I get an abort signal, as ...
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0answers
64 views

kernel(security_netlink_recv) = 0x3a2204c6 is needed

I am trying to install drbd (packages are fetched from elrepo). Both drbd and kmod-drbd are version 8.4.3-1 and I am using CentOS 6.7 with kernel version 2.6.32-573.el6.x86_64. When trying to ...
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1answer
1k views

openSUSE 13.2 kernel upgrade to stable version (4.1)

I have openSUSE 13.2, and I try to upgrade the kernel to the last stable version. I added http://download.opensuse.org/repositories/Kernel:/stable/standard/ to repository and try to upgrade with ...
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2answers
2k views

Error when compiling Linux kernel

I get an error when trying to compile Linux kernel 3.8.0-32 on Elementary OS Luna, based on Ubuntu. I have a Lenovo S400 notebook, and the command I used is: sudo make-kpkg --initrd ...
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1answer
49 views

udev - change event from udev_device_get_action

I am monitoring the events of all devices connected to the host. Linux has udev daemon , which listens to all the device specific events such as online, offline, add, remove and change. I use a ...
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2answers
1k views

Repair bootloader for fedora 22 after install windows

I already have fedora 22 and windows 7 in my machine , i wanna to upgrade to windows 10 but in fact i'm afraid to losing fedora i have read the fedora documentation but still afraid to start this ...
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2answers
426 views

What does this macro mean in linux kernel code?

see i found one config file in which this are macro defined # # Input Device Drivers # CONFIG_INPUT_KEYBOARD=y # CONFIG_KEYBOARD_ADP5588 is not set CONFIG_KEYBOARD_ATKBD=y # CONFIG_KEYBOARD_QT2160 ...
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2answers
1k views

Out of space while bulding Linux kernel

I am trying to build Linux kernel. I am getting out of space after a while. I unpacked it in /usr/src directory. It seems I have plenty of space. Can you please let me know what can be done about it. ...
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0answers
27 views

How do I compile a module with different active kernel/kernel-after-reboot versions?

Let me explain, I updated my kernel but have to recompile the wifi module to work with the new one. The thing is, I can't reboot and compile, because it's my media server to which I only have access ...
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0answers
17 views

usb issue, boot not completed; hw or sw issue?

I can't realize whether I'm having a kernel or hardware issue... clicking ctl-d the boot process doesn't come to its end. any hint?
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0answers
25 views

IOstat command changes in Linux Kernel 4.2

I implemented this IOStat command http://sourceforge.net/projects/iostat/ in Java successfully but it turns out that this command is working only for Linux Kernels between 2.4 and 2.6. If someone is ...
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0answers
464 views

Need help resolving kernel panic - not syncing: timeout synchronizing machine check over cpus

I'm attempting to install Xubuntu 15.04 x64 on a brand new high end laptop. I've already fixed a problem with the NVidia cards and needing to set nomodeset on boot but now I get this one kernel panic ...
2
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1answer
252 views

Centos 7 , cant update kernel

I am running centos-7(vm) on http://www.ovh.com/. My kernel version is 2.6.32-042stab108.8. Even after yum clean all && yum update and reboot. still kernel version is 2.6.32-042stab108.8. Any ...
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0answers
6 views

Custom built Linux kernel automatically reboots after entering my password

Recently I build my own custom kernel. After update-grub I can see the log-in windows, but after I type my password, It suddenly reboots, and I can not see the Ubuntu desktop. And then I reboot as ...
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1answer
41 views

How are system calls dealt with in a multicore Linux system?

When a thread or process from one core initiates a system call(ex. it can be fork()), the OS goes into kernel mode, assuming that multiple systems calls(ex. maybe also fork()) come in from different ...
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1answer
22 views

Linux kernel working only on kernel mode [closed]

Porting the Linux kernel to an architecture that has no execution modes (is always in kernel mode) and has no MMUs seems like a very unprotected system. Would it be possible to make Linux run in that ...
0
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0answers
48 views

Network IO throttling in cgroups

cgroups allow the user to manage the resource usages of processes or groups of processes. Block IO throttling is supported and works well. Why is it however that network IO throttling (specifying hard ...
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1answer
59 views

Signing Error during kernel compilation

I was trying to compile kernel on my system by following this link http://www.ramkitech.com/2012/04/how-to-compile-kernel-step-by-step.html when I run make command, I am getting the following error ...