for questions concerning Ubuntu's kernel, including compiling and questions relating to modules

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1answer
403 views

Ubuntu SD Card reader problem

I have realtek SD Card reader on ubuntu, and something weird happens: Sometimes it recognises SD card, sometimes it has no action at all after putting it inside, and sometimes shows, disappears then ...
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2answers
77 views

Is there an kernel version list available somewhere?

So, for dev needs, I need to find all available kernel versions for given ubuntu version, for example, Lucid Lynx server. In short, something similar to this novell wiki for SLES: ...
2
votes
1answer
151 views

Can anyone decipher this kernel segfault report? [closed]

I use bluefish a lot for coding etc but at the moment it is just closing. I have extracted the following from the logs. Does it mean anything to anyone? May 26 15:26:39 villa kernel: [ 247.521915] ...
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2answers
169 views

Kernel panic after installing a driver with ndiswrapper

So during my quest to get TL-WN821N, I got stopped by this problem.. I installed all the ndiswrapper programs with sudo apt-get install. They were, commons, utils-1.9, source, gtk and something else ...
6
votes
1answer
7k views

zram vs zswap vs zcache Ultimate guide: when to use which one

What the hell are they? how are they different (I've written my understanding in an answer below) In the Zswap system, when a page is evicted from the zswap to the actual swap is it stored in a ...
1
vote
1answer
813 views

Tp_smapi on Thinkpad T440

I have a Thinkpad T440 with Ubuntu 14.04 (using i3wm). I have had trouble installing tp_smapi. I successfully installed it with dpkg -- can't remember whether I used apt or just downloaded it ...
13
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3answers
931 views

CPU Temperature unit?

Since I am not an American, the following command outputs for example `55000' which means 55°C. cat /sys/class/thermal/thermal_zone1/temp Does this command output the temperature in Fahrenheit for ...
0
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1answer
449 views

Ubuntu Precise 12.04 Kernel Headers

Recently, on my installation of Ubuntu Precise 12.04.3 on my Beaglebone Black, while tying to install some Wifi drivers, it says it requires kernel headers. The kernel version is 3.8.13-bone30 (from ...
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0answers
57 views

Desktop screen is running slow for ubuntu 12.04

I have installed ubuntu 12.04 on my system. But screen of the system is running very slow. I checked the cpu utilization but it is normal less than 15%. Here is specifications vga kernel driver ...
6
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1answer
12k views

Ubuntu 14.04 LTS fails to start with a kernel panic

These errors occur while starting Ubuntu. I am dual booting Windows 8.1 with Ubuntu. kernel panic - not syncing : fatal exception in interrupt. shutting down cpus with NMI drm_kms_helper : panic ...
0
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1answer
206 views

compile and install modified kernel

I have made some changes to the vmx.c file of the kernel. Now I am using make menuconfig followed by make -j 5 command to compile the modified kernel(No errors just a warning..) Now I am using ...
0
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1answer
82 views

How to enable virtualization on Lenovo Z500?

I have downloaded the Kernel 3.13.6 from kernel.org and installed in the system. Updated the BIOS and then enabled the virtualization in the bios settings. Now I have used the command sudo kvm-ok ...
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0answers
212 views

14.04 on Yoga 2 Pro: ELAN USB touchscreen issue causing theme reset?

On several occasions, I've booted up and logged in only to find that my Unity theme has reset to the default Ambiance theme. I've also noticed that this only happens when I log in before the power ...
1
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0answers
137 views

How to recover ASIX AX88179 from backports installation

I recently installed https://www.kernel.org/pub/linux/kernel/projects/backports/stable/v3.13.2/backports-3.13.2-1.tar.gz with make defconfig-wifi && make && sudo make install ...
0
votes
1answer
337 views

unable to handle kernel NULL pointer dereference

I am trying to connect to a CCD camera that communicates through a PCI card. When the PCI card is sitting directly in the PC there is no problems, but when the PCI card is connected to the PC ...
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0answers
1k views

Getting “read failed after 0 of 4096 at xxxxxx: Input/output error” error for LVM

I have system with Ubuntu 12.04. On this system used LVM for managing disk drives and similar mass-storage devices. When I used lvscan command for scanning all the logical volumes then it displayed ...
0
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1answer
960 views

can i install and run an older kernel (3.10) within a latest ubuntu release (14.04)?

I would like to install 3.10.34 (http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.10.34-saucy/linux-image-3.10.34-031034-generic_3.10.34-031034.201403240135_amd64.deb ) in my current ubuntu 14.04 ...
1
vote
1answer
2k views

How can I install pf-kernel on 14.04?

There is an article here: http://www.webupd8.org/2013/05/get-better-linux-desktop-performance.html But it is not updated. Does anyone have an idea how I can do it for 14.04? Thank you!
0
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1answer
108 views

CVE-2014-0196 and grs kernel [closed]

my client is renting a server in OVH. Everyone knows about OVH and their default kernel from GRS (( Can anybody say if the kernel 3.2.13-grsec-xxxx-grs-ipv6-64 is affected to CVE-2014-0196 (not ...
0
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1answer
241 views

Delete snapshot make filesystem read-only

I am using Btrfs 3.12 and each time i delete a snapshot, the entire btrfs volume become "Read only". So i umount it and try a btrfsck --repair But every time it failed on this line: Extent back ...
0
votes
1answer
69 views

Where does dm crypt keeps crypt list?

If we enable encryption via cryptsetup tool on linux. Where does it keeps the crypt list/ encryption disk sector information etc ? Is it resides inside the LUKS header or device mapper kernel itself ...
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0answers
87 views

Kernel 3.13.0.24 won't boot

I recently updated my Ubuntu to 14.04, which also resulted in the installation of kernel 3.13.0.24 Booting this kernel always resulted in a black screen, so I simply got rid of it and am now using ...
2
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1answer
316 views

Kernel Panic while installing Ubuntu 14.04

I was trying to install Ubuntu 14.04 via a pendrive on my laptop and I keep on getting a "kernel panic" error. I think it is mostly a hardware issue because earlier it had windows installed and after ...
3
votes
2answers
7k views

Virtual Box Kernel error [duplicate]

I am using kubuntu in my laptop i have installed virtual box in kubuntu 14.04 lts but when i start virtual machine it gives me error: Failed to open a session for the virtual machine ub. VT-x ...
1
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0answers
73 views

traverse all the disks or get hd_struct by device name in kernel module

I'm writing a kernel module(on linux 2.6.32), to get the disk_stats of all the disks(not partition) in use. In other words, I'm getting the data just like what /sys/block/sda/stat shows, but in kernel ...
2
votes
1answer
110 views

Why does it take a long time to open certain small text files in Vim?

Why does it take a long time to open certain config files accessible only to superuser in Vim? For example: $ sudo vim /var/lib/polkit-1/localauthority/10-vendor.d/com.ubuntu.desktop.pkla It takes ...
1
vote
1answer
358 views

Failed Firmware for Linux Kernel Update

I'm a bit new to this, while updating the firmware for Linux kernel drivers (1.79.14) I encountered the following problem: installArchives() failed: (Reading database ... (Reading database ... 5%% ...
0
votes
1answer
60 views

Copying modules to another system

I configured and made a custom kernel from vanilla kernel downloaded from kernel.org. Now I ported it to another machine with simple 'vmlinuz' and 'initrd.img' copying and some grub config done. ...
0
votes
1answer
52 views

Ubuntu willl not boot after update

I tried turning on my laptop, but I keep receiving this screen. I'm not sure how to fix this. If I boot into recovery mode in a lower version it works, but not well. It becomes very glitchy, and I ...
0
votes
1answer
103 views

Error when updating my new Ubuntu 12.04 LTS laptop

I have just bought a dell inspiron 3537 with Ubuntu 12.04 LTS pre-installed. However, update manager cannot successfully finish the initial update. Here's part of the log at ...
5
votes
2answers
6k views

Where is the installed kernel source located?

I have installed kernel source with sudo apt-get install linux-source -y Now, where is the source located?
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2answers
93 views

How can I get the source code for Ubuntu 2.6.38.8 kernel?

I need the source code for kernel 2.6.38.8 (for research reasons). I have the vanilla Linux source from kernel.org, but I would like the Ubuntu release. Thanks!
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2answers
611 views

Cannot boot: kernel panic not syncing

This is my first time asking questions here. I apologize for my poor English. I was using Ubuntu 13.10. While unzipping a passcode-locked file, my system crashed. Since then when I try to boot the ...
1
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0answers
63 views

How to boot into single user mode in 14.04 [duplicate]

I am trying to switch to single user mode in 14.04. I tried sudo telinit 1 but this never gives you a prompt. I then tried editing the boot options from the grub menu when I reboot. I see a ...
0
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2answers
86 views

Having backup kernels in ubuntu

I had many kernels in my Ubuntu, but recently I deleted all of them (except one) as they were corrupt. Now I am left with a single kernel onto which I log in every day. I am afraid as to what will ...
1
vote
1answer
163 views

apt-get autoremove “Before uninstall, this module version was ACTIVE on this kernel”

When running apt-get autoremove (or dry run with -s switch), what does the following message mean? Status: Before uninstall, this module version was ACTIVE on this kernel. And what should I do to ...
4
votes
1answer
535 views

How does the kernel load firmware? [closed]

Recently I've been struggling to get a wifi card to work properly (bcm43228), and had a few related questions. Questions are all related to the same subject, so imo it makes sense to make only one ...
0
votes
1answer
131 views

ptrace-scope is unaccessible

When installing Ubuntu 14.04 the following message came up when some component install seemed to go awry: if install fails set /proc/sys/kernel/yama/ptrace-scope to 0 I have tried editing the file ...
0
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2answers
181 views

Will I loose data or software when upgrading the kernel and/or OS version?

I have a doubt. I'm using Ubuntu 13.10. If I change my kernel version, will any data be lost? I've installed some software packages, will those still be present after updating my kernel? And the same ...
0
votes
1answer
432 views

ftrace on ubuntu 12.04

I wish to work with ftrace on ubuntu and able to use trace-cmd (http://manpages.ubuntu.com/manpages/precise/en/man1/trace-cmd-start.1.html). But as per this http://lwn.net/Articles/365835/, I want to ...
5
votes
2answers
350 views

How is entropy gathered for /dev/random in Precise

With a standard install of Ubuntu 12.04 how is the entropy for /dev/random gathered. Is the install smart enough set up any hardware generation available, will it use user based sources like keyboard ...
0
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0answers
61 views

Kernel panic at startup

Recently i have installed a second hdd with windows 7 on it. After that, i installed grub on my main disk (ubuntu) from a live-usb. However, soon after, when i have tried to load ubuntu (from grub ...
0
votes
1answer
419 views

Chroot with specific kernel

I need to build some old drivers with specific kernel version. The Kernel 2.6.31-20-generic is needed. I have tried to built it on Ubuntu 12.04 and the new one, 14.04 with no success. The only one ...
2
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0answers
94 views

Black screen after upgrade 12.10 now a very simple question

SO HERE IS MY QUESTION: What can I do to prevent this from happening next time I upgrade Ubuntu to another version? Here is a long involved saga of reinstalling nvidia drivers resulting in a happy ...
0
votes
1answer
329 views

laptop hangs and dies with following crash log. [closed]

May 11 10:48:50 gyanu-SVT13135CXS kernel: [ 87.533282] usb 3-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 May 11 10:48:50 gyanu-SVT13135CXS kernel: [ 87.533284] usb 3-1: Product: ...
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2answers
931 views

Are Linux Headers installed by default? How to check if they're installed?

Are Linux Headers installed by default? How to check - via command line - if they're installed? (in Ubuntu and Lubuntu 14.xx)
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2answers
2k views

Kernel panic after attempting to upgrade to Ubuntu 14.04

I have the following problem: I was trying to upgrade from Ubuntu 13.10 to Ubuntu 14.04 and in the middle (after the necessary packages were downloaded and beginning to be installed), I ran out of ...
0
votes
1answer
33 views

Trying to patch k10 optimized zen kernel, getting invalid option

Hi this is my first try on askubuntu, i hope you can understand what i say here's the thing, I'm trying to patch a kernel, but patch says i put an invalid option in, which i have no idea where it is ...
1
vote
2answers
2k views

Installed 14.04 on a non-PAE (Pentium-M), but now I can't update (“This kernel does not support a non-PAE CPU.”)

Here is what I'm looking at. This isn't my computer. I repair PC's and I had an end user with this low powered laptop running XP so I decided to let him try out lubuntu. The install went smoothly with ...
2
votes
0answers
176 views

Is it possible to compile a kernel module under chroot?

Under a chroot environment, is it possible to build a kernel module without having the kernel installed, just the headers? It sounds like something you wouldn't want to do, but in my case I do. I've ...