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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2
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162 views

Linux boot fails with /dev/disk/by-uuid/XXXX does not exist - Asus Zenbook Pro Touchpad Not Working

Device: Asus Zenbook Pro ux501vw-ds71t Ubuntu Version: 15.10 I installed Ubuntu 15.10 and the installation was successful. However, the Elantech touchpad did not work. I read that the newer 4.5.0-...
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181 views

Chipsee 7 inch LCD support in Linux kernel 3.14

Has anybody ported Chipsee 7 inch LCD on Linux kernel 3.14 or later ? Is there any patch available for the same ? If no patches any suggestion porting Chipsee LCD support from Linux kernel 3.8 to ...
2
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0answers
581 views

/sbin/init exists but couldn't execute it

I'm building Linux from scratch. Currently I have the kernel, glibc and sysvinit. I've compiled everything myself following these instructions. Though my version of glibc is 2.19. Also, I use grub ...
2
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0answers
159 views

How are ties broken in AuFS with the top-down-parent file creation policy?

The AuFS manual says: Policies for Creating create=tdp | top−down−parent Selects the highest writable branch where the parent dir exists. If the parent dir does not exist on a writable branch, ...
2
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0answers
239 views

What does the linux kernel/initrd loading time depend on?

I recently updated my Linux kernel from 3.1.10 to 3.5.0. Upon booting with GRUB, I noticed that this kernel (or the initial ramdisk?) takes a much longer time to load (~5-6 s vs. ~1 s with the old ...
2
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0answers
228 views

Capture key events at system level to control e.g. alsamixer

In Linux window managers, it is easy to define actions for key events - e.g. in openbox: <keybind key="XF86AudioRaiseVolume"> <action name="Execute"> <command>amixer set ...
2
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0answers
240 views

Linux kernel 2.6 - layer 7 support?

From what I found on the Internet, Layer7 classifier support is not merged into the current kernel (as of 2.6.39-rc6) and can be achieved with a patch. Is it known when (if ever) the support will be ...
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0answers
46 views

What is the minimum amount of RAM required to run Linux Kernel in ARM cortex-a5?

I want to know what is the minimum amount of RAM required to run Linux Kernel (4.6) in ARM cortex-a5. Now I am using 32MB PSRAM but whenever I am loading vmlinux (elf format) through debugger to ...
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0answers
32 views

Kernel panic not syncing attempting to kill init

We have a Citrix Xenserver 6.2 install. Today we had an incident where power to the server was suddenly cut off from the server. It had been running for quite some time without issue. It has quite a ...
1
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0answers
39 views

Disable RAID in custom kernel?

I need a Gentoo 13 machine to test some software on the platform. I'm not a Gentoo regular, so I'm suffering their procedures. I noticed the kernel spends a couple of seconds booting due to RAID ...
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0answers
20 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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633 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
35 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 ...
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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
624 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 ...
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0answers
83 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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0answers
86 views

F2FS issue - unsuccessful remove, lost access to files

While removing unnecessary files I bumped into an error. with fsck.f2fs /dev/sda4 -t I can see | | |-- Die Ärzte - Manchmal haben Frauen <ino = 0xc11874>, <encrypted (0)> | | |...
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0answers
38 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
68 views

Which devices in /sys/block are HDDs?

I'm interested which devices in /sys/block are real HDD drives: [root@sdp1a block]# pwd /sys/block [root@sdp1a block]# ls dm-0 dm-12 dm-3 dm-7 loop1 loop5 ram1 ram13 ram3 ram7 sdaa sdae ...
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0answers
37 views

Keyboard and mouse don't work after kexec

While installing Fedora on my MacBook Pro Mid 2012 I've occasionally used kexec command to "boot" from live environment to the installed system. # yum install kexec-tools.x86_64 # mount LABEL=/boot /...
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43 views

pppd retry issue with multiple wan interfaces

I am using two wan connections in my router with linux kernel 2.6.21. PPPOE Ethernet cable and 3G connection. Both need ppp setup. But boot sequence is different for both. many times 3G disconnect and ...
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29 views

How to disable USB Mouse only

I was developing a device driver for a USB mouse which uses the USB HID driver. The problem is that I cannot test out my module as Linux takes over the mouse directly. So how do I find out which ...
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0answers
351 views

Linux - How to list all device nodes using a specific device driver

I know I can see what driver is being used for a device node if I know the major and minor number of the device(see this link). But I want to know if there's a way to list all device nodes that are ...
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0answers
168 views

getting error while adding a system call

I'm using Ubuntu 12.04(64bit) and installed kernel version linux-2.6.37.3. My device is ASUS x201ev net-book(64 bit). I'm providing the link of procedure i used. i edited unistd_64.h file also and ...
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0answers
141 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 <linux/gpio....
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0answers
7 views

How to approach searching for sources of interface unresponsiveness

On Debian Linux: On a relatively powerful machine I ran an update and both the kernel and the window manager got updated to newer version. At that point the machine become noticeably less responsive: ...
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0answers
852 views

DKMS failing to complete in Ubuntu 12.04

After my last attempt to run an update with sudo apt-get update; sudo apt-get upgrade I got into a never returning update step (see below). So far I can only Ctrl+C but it will be triggered again ...
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0answers
830 views

bash autocompletion is slow, freezing my desktop

sometimes when working with a custom kernel, pressing tab in the bash autocompletes at a horrible pace. It freezes the whole desktop. Then comes back after awhile. This is the only quirk that I've ...
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0answers
50 views

Who is filling the ELF header

I have ELF file which I dumped using readelf -h filename and I can see the different fields with the some values like entry point address is 0x99cc ,but really want to know from where these values get ...
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0answers
128 views

Installing Kernel 3.5.1 breaks boot up

I have twice tried to update my kernel from 3.2.0.30 to 3.5.1 on my Ubuntu 12.04 32 bit system using two different methods I found via google. In both cases the operation appeared to run flawlessly ...
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232 views

An error during bochsdbg installation

I want to install bochs which can debug the kernel. First, I download a package, then: tar zxvf bochs-2.4.6.tar.gz<br> cd bochs-2.4.6.<br> ./configure --enable-debugger --enable-disasm ...
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1k views

Use initrd as root filesystem for network boot

I'm creating a stand-alone set of netboot images based on a LinuxFromScratch installation (7.0, kernel 3.1.0). I want to deploy that image to many diskless clients, but NFS is in my situation not an ...
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0answers
913 views

Setting up a Remote Diskless System

I am trying to setup a PXE Boot server with RHEL 6 and am following these directions. Has anyone done this successfully?? I am having various issues. I used the rsync command to copy over the ...
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0answers
105 views

kernel 2.6.36 not booting

I m a newbie to kernel programming. I am trying to boot the kernel 2.6.36 on my ECG machine.It was working perfectly on 2.6.33.2. It is getting stuck on this step: ## Booting kernel from Legacy Image ...
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0answers
197 views

Upgrading kernel in live ISO file?

I'm no Linux expert and I need to upgrade the kernel, and some applications, in a Ubuntu live ISO file whose structure looks like this: I've never done this before, and would like to check ...
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0answers
11 views

Configure traffic class to bringup DCB in back-to-back setup on linux

OS :- CentOS 7.2 kernel 3.10.0-327.el7.x86_64 lldpad:- lldpad v0.9.46 dcbtool:- v0.9.46 ixgbe :- ixgbe-4.3.15 steps followed:- modporbe ixgbe service lldpad start Redirecting to /bin/systemctl ...
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0answers
19 views

Enable user namespaces in Debian kernel

I'm trying to figure out how to enable user namespaces capability in my kernel (I think CAP_SYS_USER_NS). I'm using Debian Stretch, kernel 4.6.0-1-amd64. My assumption is there is a way to turn ...
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0answers
8 views

Adding supplementary group id to process

I'd like to add addition sgid to a running process. If i'm superuser, is there any option (system call) to change this (or any other process credential) without running it from a different user or ...
0
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0answers
13 views

Display basic image color on the framebuffer

I am trying to debug an issue during the installation of Debian on PowerPC. It seems the Open Firmware Frame Buffer (offb.c built-in driver) is not setup correctly, and has red channel inverted with ...
0
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0answers
19 views

container running CentOS7 on a Centos6 host?

I thought that the containers uses the same kernel as the host... so I thought OS using different kernel versions wouldn't work and I did a test to prove this: I created a VM on virtualbox and ...
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0answers
38 views

Unable to mount boot partition

I have compiled a custom environment using Yocto. I have most everything working now, but I've hit one major problem. The system boots fine, but after it does, I can't mount the boot partition. ...
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0answers
10 views

remove link form Linux namespace

I created a namespace in Linux with 'ip netns add foo', created a pair of veth interfaces and moved one in the namespace. I set up IP addresses etc., so that now I can ping my 'foo' namespace from the ...
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0answers
68 views

initramfs boot error on dual boot machine

Scenario: Dual boot windows7 and ubuntu machine. I downloaded a new linux kernel and then implemented 3 system calls on it. Then I compiled the kernel on ubuntu and tried to boot into the newly ...
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0answers
8 views

Enabling TransHugePage in User Mode Linux

I am running User Mode Linux with Gentoo file system and using 32 bit Linux kernel version 3.12.36. I am not able to enable THP because I am not able to find the requisite file: ls /sys/kernel/mm ...
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0answers
20 views

Flashing Linux on Ncommputing L300 board

I have a bunch of L300 Thin client nodes which are of now use to me any more. I plan to give away the units after flashing linux into them, because as a standalone device wont achieve achieve ...
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0answers
31 views

Install x86_64 kernel on already installed i686 system

I have a 64-bit machine with Arch Linux i686, while the processor (Intel Pentium G3258) could support 64-bit. Being a 32-bit OS I can only use 3Gb of RAM out of the 8Gb installed. Since I have a ...
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0answers
41 views

Custom Android kernel with Sys V IPC

I know that Android uses Google's own Binder IPC, which is built-in to every Android kernel. This causes a dilemma for running GNU/Linux systems on a mobile device: keep the Android kernel, and ...
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0answers
70 views

ACPI doesn`t work properly?

My PC with next parameters H/W path Device Class Description =================================================== system P5K PRO (To Be Filled By O.E....
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0answers
25 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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0answers
41 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 ...