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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1answer
27 views

Why an OS has same name on different achitectures?

What is the similarity in running a same OS (like Linux) on different architectures? I mean, we cannot run Linux x86 apps on Linux ARM. And even the OS itself is constructed differently for different ...
1
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1answer
14 views

Unable to find linux Kernel Headers

I am running a custom kernel(I am not the creator of it). I need the header files for the same. . I have tried installing the header files using this command. sudo apt-get install ...
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0answers
12 views

Possible problems of down grading linux-kernel

I am running a Open Network Linux on a switch, it is running a 3.8.13-OpenNetworkLinux-e500mc-1.5, which is a variant of linux kernel 3.8 . I want to change to linux kernel 2.6.27. Will there be any ...
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0answers
9 views

Strange noise with alsa-oss-emulation

I try to access the sound chip via ALSO OSS emulation on a ETX-BT-module (x64-CPU, x86-Kernel, vanilla kernel 3.10.10, busybox, Realtek ALC 262, 4-channel High Definition Audio integrated into SOC ...
0
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0answers
37 views

USB drive not getting recognized as scsi device in custom linux kernel

I am facing a slow write speed problem with a USB drive in my custom linux kernel. I suspected to be a hardware problem but with the same hardware and Opensuse 12.1 OS, write speed of my USB drive is ...
0
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1answer
25 views

System hangs when using too much RAM even with swap off

When I run a piece of python code that uses too much RAM, my computer would start to swap so badly that I had to do a hard reboot. To fix this I turned off swap assuming that the OOM killer would ...
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0answers
19 views

Ubunbtu 12.04 iptables error after upgrading kernel to 3.4

I been using Ubuntu 12.04 for well 3 years and using it with kernel 3.2. I decided to upgrade to kernel 3.4 because some freezing problems starting to occur more and more. Well the update went well. ...
2
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1answer
22 views

In Linux, how is a program loaded into memory when the OS decided to run it?

As we know, Linux implements page cache to store the code or data from pieces of a file that will be potentially used. One of my question is, when a program, e.g. vim, is going to run, its data and ...
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0answers
14 views

notebook asus x551ma - moire pattern takes place - how to reduce effect on linux

I just faced a strange issue with my notebook asus x551ma LED and LCD (the Moire Pattern) which is quite good described on wiki pages; Some users provide "how they handle the effect for their ...
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2answers
20 views

How can I tell what process is unmounting a file system?

I am trying to troubleshoot an issue with a fuse library, where it appears that someone is causing my file system to be unmounted soon after it is mounted. Does anybody have any clever ideas how I ...
0
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1answer
13 views

dmesg -n 7 doesn't print anything, but dmesg prints a lot

As stated: $> dmesg [ 0.000000] Initializing cgroup subsys cpuset [ 0.000000] Initializing cgroup subsys cpu [ 0.000000] Initializing cgroup subsys cpuacc ... $> dmesg -n 2 [ ...
1
vote
1answer
40 views

Sharing a hard drive between two hosts, one at a time

I have a large hard drive in my desktop computer. My laptop has an eSata port. Sometimes, I power-up the desktop PC, without booting, just to get juice flowing into the hard drive so that I can ...
1
vote
1answer
80 views

Force a Linux kernel module to be compiled as a module instead of built-in

I have the sources of the kernel of an embedded Linux box (specifically a QNAP NAS) which is running a 64-bit v3.12.6 Linux kernel, together with the kernel config files. What I'm trying to do is ...
0
votes
1answer
88 views

How to change the default terminal beep frequency of the PC speaker?

I want to change the default sound frequency ofSND_BELL(which is used when\aor BEL or ^G is printed on the screen) to higher values (the current default is around 750Hz). Of course this turn to need a ...
1
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1answer
19 views

Ubuntu 10.04 | Terminal Freezes on certain commands | MTU

Isolated problem: I try to cat /etc/rc.local and I can't do anything in the ssh session after that. I've tried many of the common things, but it seems to freeze on any command, but I can do an ls, ...
2
votes
1answer
42 views

VirtualBox broke Fedora networking - how to fix it?

I was trying to install VirtualBox in my Fedora 21 machine. However, the cited machine has Secure Boot enabled and obviously VirtualBox startup failed miserably due to lack of signing in its modules. ...
0
votes
1answer
76 views

Uninstall latest kernel using yum

The latest kernel kernel-3.10.0-229.1.2.el7.x86_64 panics at boot on my CentOS 7 box due to a kernel bug. Since this kernel is the default in GRUB, if I forget to manually change the kernel selection ...
0
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0answers
63 views

Kernel building with CONFIG_LOCALVERSION doesn't work with fakeroot debian/rules binary-generic?

I'm following the instructions in https://wiki.ubuntu.com/Kernel/BuildYourOwnKernel and I've set CONFIG_LOCALVERSION in the menu to "xhci_mod_test". I then run fakeroot debian/rules and it proceeds ...
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0answers
18 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 ...
0
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0answers
15 views

How to change kernel message VT in linux

I feel kinda stupid, since I'm certain I used to know this. But here goes. How can I change which VT kernel messages print to? I use text-mode primarily, typically on vt1. Unfortunately, kernel ...
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0answers
39 views

Build DAHDI for Beagleboneblack Error

I'm planning to build DAHDI for Beagleboneblack Firstly, I built the kernel for BBB completely by following this tutorial http://elinux.org/Building_BBB_Kernel make ARCH=arm ...
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0answers
19 views

Thinkpad Edge E545: Failure to load kernel through efi

Now this is an issue I've been battling for a long time ... I am trying to make a proper UEFI dualboot system, the problem is I cannot seem to load gentoo kernel either simply by using EFI stub (also ...
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0answers
28 views

why an interrupt context should not sleep?

In linux i have studied that an interrupt context should not sleep because it can not wake up again. Why it can not wakeup ? What happened if its go to sleep ? please explain in detail Thanks in ...
0
votes
1answer
49 views

how to enable pci hotplug support in ubuntu 13.04

Kindly help. I have a pci-based wifi adapter which is not getting detected when i plugged it into the laptop. OS: Ubuntu 13.04 Kernel version: 3.8.0-19-generic
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2answers
2k views

Where are Kernel Headers for Fedora 21?

I'm trying to install VMware on Fedora 21. I've installed the kernel headers: sudo yum install kernel-headers-`uname -r` And I receive the following message: Package ...
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0answers
20 views

cpusets compiled in kernel but not visible when running

Device: radxa ( 4-core ARM ) the official kernel from radxa is used with the ubuntu 14.04 rootfs : https://github.com/radxa/linux-rockchip.git. As cpusets where not enabled in def_config, i enabled ...
1
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1answer
57 views

Where is /sys/subsystem as described in Linux kernel doc?

Quote from https://www.kernel.org/doc/Documentation/sysfs-rules.txt: [...] It is planned to merge all three classification directories into one place at /sys/subsystem, following the layout of the ...
1
vote
1answer
28 views

What's the minimum overhead of a Linux container?

If I understand this correctly, a container, once running, shouldn't have any CPU overhead. Is that correct? It does have a memory overhead. How big might that be? How would I measure it?
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0answers
39 views

How can I change a ChrUbuntu 12.04 install over to Arch ARM on a first generation Samsung Chromebook XE500C21?

I installed ChrUbuntu 12.04 on my Chromebook (Samsung XE500C21) using this script. Is there a way to swap my distro over to Arch ARM? Failing that, is there an easy way to install Arch ARM on the ...
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votes
1answer
46 views

Does the guest OS need updates/changes after changing the number of cores in VMware Player?

I installed ubuntu on a vm in VMware Player and forgot to change the number of cores from 1 to 8. If I change that now will the linux kernel need to be recompiled or anything like that or will it just ...
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0answers
49 views

UBI ERROR: Attach Error

I get this UBI error while I try to attach mtd device. [root@npa-be ~]# ubiattach -d 0 -m 3 UBI: attaching mtd3 to ubi0 UBI: physical eraseblock size: 1048576 bytes (1024 KiB) UBI: logical ...
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0answers
102 views

Using a gif for linux kernel boot up

I want to use either a gif or multiple looped images instead of the default linux boot up image. I know it is possible to replace the default image with another image, but is it possible to use a gif ...
0
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0answers
61 views

How to say the kernel to prefer self built kernel module from extra folder?

I am on Debian 8 with 3.16.0-4-amd64 kernel. It delivers already a driver for some hardware and I want to replace it with my self built module. The files are correctly installed in the extra folder: ...
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0answers
18 views

Is system call the only way that a user program can intentionally affect the state of a Linux kernel?

I think there are several ways that a user program can intentionally affect the state of a Linux kernel. By invoking a system call; By invoking mmap() and writing the memory that has been mapped to ...
1
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2answers
113 views

How can I get socket information, from outside of a Linux process, on its socket?

I'm specifically interested in listening TCP sockets, but getting all and any socket (struct sock, as defined in Kernel's include/net/sock.h) information for a socket would be nice. For example, this ...
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1answer
25 views

How to compile the linux without any audio codecs?

I want "no audio" functionality in an embedded system. So, any idea about how to configure kernel without any audio? Thanks.
1
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1answer
244 views

Cannot start LXC container: failed creating cgroups

I am using LXC (Linux Container) 1.0.6 on a Ubuntu 14.04 64bit Virtual Machine trying to build HTTP service in a container. I have trouble starting the container: $ sudo lxc-start -n test1 lxc-start: ...
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0answers
34 views

update-grub creates a menu entry with read only option

I am trying to automate the installation of a new linux kernel across a data center. After the installation, my script runs update-grub to add an entry to the grub menu. It updates ...
0
votes
1answer
85 views

Where can I find the origin of specific modprobe conf option to erase it?

When I do modprobe -c |less The configuration files contains: options nouveau modeset=1 options bbswitch load_state=0 unload_state=1 options b43 nohwcrypt=1 qos=0 options rd md=0 options rd dm=0 ...
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0answers
69 views

BATMAN protocol

I am having problems with Batctl. I installed Batman adv and batctl on ubuntu 14.04.1. I am having problems with batctl commands. When I write comand "Batctl p 00:16:bf:01:68:46" i get this error: ...
0
votes
1answer
111 views

What could cause out_of_memory & __alloc_pages

Sadly my server is permanently hangging due to out of memory: Nov 8 07:30:43 crawler kernel: Nov 8 07:30:43 crawler kernel: Call Trace: Nov 8 07:30:43 crawler kernel: [<ffffffff800cb625>] ...
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0answers
29 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 ...
0
votes
1answer
47 views

Patch files for Linux Kernel 2.6

I am doing some data analysis on the code base of Linux kernel version 2.6. However I noticed that in the kernel website (https://www.kernel.org/pub/linux/kernel/v2.6/) patch files are missing after ...
2
votes
1answer
91 views

Gentoo Linux: Building a kernel that only only contains drivers for the hardware in place

I would like to build a kernel for my system that only contains modules for the hardware which is really in place. Of course I can walk through lspci and manually select all the necessary device ...
0
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1answer
60 views

Will Linux work correctly with full root partition?

Will Linux work correctly when root partition is completely filled up? Let's say my application is running on different partition and has enough space. What about Linux kernel? Will it continue ...
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0answers
33 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 ...
1
vote
1answer
47 views

Linux NTFS-3G General Protection Fault when using OS X in VirtualBox

I have an OS X virtual machine in VirtualBox on a Debian host. The disk image is located on an NTFS partition (which is not the system's root partition), mounted using NTFS-3G. The machine was ...
2
votes
0answers
105 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 ...
3
votes
1answer
2k 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: ...
0
votes
2answers
72 views

installing linux without any packages

I am programming a OS based on Linux but I want to "re-invent the wheel" in this OS just as an achievement. I have been told that Linux can be installed on a PC without any packages (obviously causing ...