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

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No mouse after fresh install

I installed 12.04 64-bit on a 120GB SSD. I reboot after the install (no errors so far) and the mouse is not working. I tried depmod but this throws an error: /lib/modules/*****_generic is missing ...
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263 views

problems with network connetion after update to kernel 3.5.0-24

After release of ubuntu 12.04.2 I tried update my system with: sudo apt-get install linux-generic-lts-quantal xserver-xorg-lts-quantal unfortunately after that my network was not working. It just ...
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234 views

Unable to handle kernel NULL pointer dereference at 000000000000001b0

After doing the normal update-manager updates an hour ago on ubuntu 12.10, I rebooted my computer. Everything seemed to be going fine however as soon as the login gui is supposed to appear, the screen ...
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42 views

How do you rebuild and apply a portion of the kernel?

I was following the steps here to build my own kernel, which worked great, then I wanted to make a small tweak to the setup file (/arch/x86/kernel/setup.c) and rebuild it to see my message printed in ...
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103 views

Where do I get linux-headers-3.0.0 for 12.04

I'm pretty new to Ubuntu, so question may seem stupid. I have a module which used to work on my parents laptop. After several updates module no longer works, and I'm pretty sure, old kernel would ...
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278 views

Unable to install Ubuntu - Kernel panic

I was installing Ubuntu 12.10 but my computer shut down and every time I tried to install, showing the following:
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148 views

What priority to use calling sched_setscheduler

I am writing a server that I do not want preempted by any other user process or "low priority" kernel process. I'm using code like this: struct sched_param sched_param; memset(&sched_param, 0, ...
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56 views

problem with vga and kernels

I'm trying to do a clean installation of ubuntu 12.10 in my desktop computer. I have an Ati/Amd hd 6450 I tried the live-cd and it worked well so i proceed with the installation. It finished ok. and ...
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212 views

How can I direct make-kpkg to output .deb files to a different location?

I am compiling a new kernel on my Ubuntu 12.04.1 using make-kpkg. In order to do so, I'm doing the same process as suggested in izx's answer. However, I want to direct the generated .deb files to my ...
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96 views

How can I disable all console display on my Nexus 7?

I am writing some code to address the raw framebuffer and would like to suppress all writing to the display including anything at boot. I have tried to use abootit to set the kernel parameters to ...
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541 views

disable initramfs in order to accelerate boot process

I was wondering if it is possible to disable initramfs on an ext4 partition in order to reduce the time it takes Ubuntu (12.04) to boot. See source here! Instead, setting up the root device directly ...
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Is this considered a minor kernel update from 3.2.0-24.38 to 3.2.0-35.40?

I am thinking of installing Ubuntu 12.04.1 LTS, 64 bit, English. It comes with a kernel version 3.2.0-35.40 One of my programs only support kernel version 3.2.0-24-generic. On ...
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401 views

Convert existing Ubuntu desktop 12.10 installation to have Xen Guest Support

It looks like previous versions of Ubuntu had a package called linux-ec2 that would install a kernel with Xen Guest support. I was unable to find any packages in specifically 12.10 that install a ...
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143 views

How to use dmatest.ko?

I want to initiate a DMA-Transfer for testing. I stumbled accross a dmatest.c in the kernel sources (drivers/dma). I compiled a Kernel with this Module and tried it without any params. sudo modprobe ...
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46 views

Linux kernel: page substitution policy

I am supposed to answer for homework which algorithm is implemented in Linux for the virtual memory page substitution and also give some extracts of the code to prove that. After some research I have ...
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282 views

Problems with booting Linux after updating kernel

After updating linux headers from 3.5.0-19 into 3.5.0-20 i faced booting problem. I don't know reason, sometimes boots normally, but sometimes i need to reboot 3-4 times. I tried to boot with recovery ...
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96 views

Clean uninstall of kernel

During installation of ubuntu kernel 3.5.0.20-33 sthg. wrong happened, I guess during initramfs. How can I cleanly uninstall the kernel? apt-get remove --purge linux-image-3.5.0.20 and re-installing ...
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687 views

where can i get vmlinux file for running kernel

I'm developing several kernel module. Also i need some profiling to be done. As all my work is kernel modules, rebuilding kernel seems a overkill. I've seen KGDB/KDB and Oprofile is enabled in default ...
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137 views

VMPlayer does not flush all outputs to serial port

I am debugging a Linux kernel in the VMPlayer on Ubuntu 12.04 configured a serial port to a file to see the debug information. However, each time when the kernel panics, only the backtrace stack were ...
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411 views

Kernel panic on reboot after failed logical volume resize

I attempted to do a logical volume resize yesterday using the follwoing commands $sudo pvdisplay "/dev/sda8" is a new physical volume of "113.11 GiB" --- NEW Physical volume --- PV Name ...
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1k views

WiFi can't connect after suspend

I've had this problem since Ubuntu 11.10 (my first install) but I was able to get around this issue with this answer. After I installed Ubuntu 12.04.1 I tried to use the same fix as before but I ...
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10 views

How to debug a kernel panic? Ubuntu 14.04

So, I have been having kernel panics. My computer will suddenly come off and then a dmesg like output shows on the screen. The last line reads something similar to [21853.218169] dkms: panic ...
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5 views

Xenomai: binding failed: Cannot allocate memory

I installed and configurated xenomai using this guide. There are some examples under xenomai2.6/examples/rtdm/driver-api. To add rtdm module to kernel, I added my gid using below command echo "1000" ...
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9 views

Hang in 14.04 when mounting NTFS Drobo via Firewire

I was trying today to upgrade my file/media server to 14.04, which has a Drobo attached via Firewire (lspci identifies the controller as TI TSB82AA2). The new kernel sees the controller and Drobo ...
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10 views

LIS 3.5 under Ubuntu 12.04 LTS

Unfortunately I needed to run an Ubuntu Server 12.04 LTS under a Hyper-V from MS. After install, I pass through big problems with network and i/o performance. The Hyper-V recommend to update the LIS ...
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47 views

How to install VirtualBox in Ubuntu 12.04 LTS: “No suitable module for running kernel found”

I have a fresh 12.04 LTS installation. I have installed linux-headers-generic as well as build-essential. When I install virtualbox, I get the following error: Building initial module for ...
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15 views

kernel make zImage error - No rule to make target vmlinux

I've been searching for a couple of days and I can't find anything on google about an interesting error I get when compiling a linux kernel. I initially thought this problem had something to do with ...
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9 views

creating a copy of a process in linux kernel

I'm trying to create a copy of a task_struct in the same kernel where the copy's original task_struct is. The copy should have a different PID and the state should be same as the original ...
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13 views

How to cause a test crash with kdump?

After installing linux-crashdump and kdump-tools according to https://wiki.ubuntu.com/Kernel/CrashdumpRecipe and configuring the latter so that cat /sys/kernel/kexec_crash_loaded prints 1, I'm having ...
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15 views

Xenomai: /dev/rtheap is missing

I want to use `xenomai . I try to install on my pc. I read this page and did these steps: http://www.stanley.gatech.edu/skelly/uncategorized/installing-xenomai-on-ubuntu-12-04/#comment-3379 But I ...
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32 views

Removed the wrong kernel

I was updating my Kernel today (or at least trying to) from (I think) 3.13 to 3.17-rc6 and while I was doing it I installed the low-latency kernels by mistake. I then removed some unwanted kernels (I ...
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25 views

VMWare 8 will not work after upgrade to 14.04

When I try to execute VMWare i receive the message: -VMware Kernel Module Updater --Before you can run VMware, several modules must be compuled and loaded into the running kernel. ---Kernel Headers ...
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10 views

Unable to find my desktop after I boot with a lower kernel

Where is my desktop? My os is Ubuntu12.04.3 3.8.0-29-generic. I reboot the kernel with 3.2.0-23-generic.By sudo gedit /etc/default/grub change GRUB_DEFAULT=saved GRUB_TIMEOUT=2 ...
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27 views

Unable to install GCDemu in Trusty Tahr

After trying to install gcdemu from ppa I always get this error and im unable to install it I get this error (synaptic:6595): GLib-CRITICAL **: g_child_watch_add_full: assertion 'pid > 0' failed ...
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97 views

ubuntu doesn't boot with initrd.img-3.13.0-35-generic and initrd.img-3.13.0-36-generic

I'm not able to boot with initrd.img-3.13.0-35-generic and initrd.img-3.13.0-35-generic - just drops into a busybox shell with the regular generic message. I though that was something kernel related ...
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37 views

Gave up waiting for root device-edited grub and even tried reinstall

After I upgraded the Ubuntu kernel from 3.8.0-29 generic to 3.16.2 i tried to reboot and got dropped to the busy box shell with an initramfs prompt exactly like this Gave up waiting for root device. ...
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27 views

How to recompile kernel in Ubuntu 14.04?

I wanted to recompile the kernel in my present working directory. I used the below command tar xjf /usr/src/linux-source-3.13.0.tar.bz2 as my current version is 3.13.0-32-generic, to unpack and ...
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34 views

Ubuntu 14.04 Kernal Panic - kernel bug at /build/buildd/linux-3.13/kernel/timer.c:930!

This seems to happen intermittently, I can't seem to reproduce the it. It happens at least once a day for the last week or so. Quite frustrating! Screenshot I am unable to get a command line to take ...
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33 views

computer does not start

I'm using ubuntu 14.04.1 LTS and everything works fine from the day I installed it. Now when I am trying to start my computer, the screen is continuously stuck with so many messages like this: ...
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9 views

When building kernel dbg package with ubuntu kernel repo, got this error “Can't read private key”

When building kernel dbg package with ubuntu kernel repo, got this error: make[1]: Leaving directory `/git/nsx-thirdparty/linux-3.14.17' # Add .gnu_debuglink sections to each stripped .ko # pointing ...
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23 views

Some USB ports aren't enabled

I am using Ubuntu 14.04. My computer has an AMD FX-8350 Vishera 4.0 GHz Octal-Core AM3+ processor. My computer has 8 USB ports, but only two of them are active. The processor in the boot enables all ...
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28 views

Reporting a subtle bug in Ubuntu 14.04 kernel

Note: I have filed this bug on Launchpad and can be seen at https://bugs.launchpad.net/ubuntu/+bug/1369374. I am reporting it here as well hoping to find a workaround. I have reasonably good ...
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30 views

kernel 3.16 update with BF Scheduler

I use an old asus eee pc, and try to boost it up. Actually I use the mainline-kernel 3.16 and found out there is a bfs-patch from http://users.on.net/~ckolivas/kernel/ I want to try BFS instead of ...
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90 views

Serial Port not Working on 14.04 LTS Desktop

System Spec : Ubuntu 14.04 LTS Desktop x64 on Dell Optiplex 3020. I am interfacing a VoIP card (TI Manufactured) which can be connected to PC by using serial port(RS 232). Can't Provide More Info on ...
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18 views

Warnings during kernel compiling

I'm compiling custom kernel and during the process I'm getting warnings such as: drivers/isdn/hardware/eicon/message.c:6115:1: warning: the frame size of 1184 bytes is larger than 1024 bytes ...
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141 views

Ubuntu 14.04 kernel update

I have a problem with updating the kernel on ubuntu 14.04, the system detects the updates and the latest version is installed, and unfortunately when I start ubuntu I always find the old version or ...
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27 views

Ubuntu crash. Maybe “mtrr”?

I've a problem with Ubuntu 14.04. It block. The "capslock", and "numlock" doesn't work. I must do a reset (with the button). The mouse don't move anymore. I've desactivate "zram" now. Here a part of ...
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21 views

Could you advise which ubuntu kernel git repo contains kernel 3.14.17?

Could you advise which ubuntu kernel git repo contains kernel 3.14.17?
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11 views

Ubuntu Sony Vaio VPCZ 133

I tried to install Ubuntu 14.04 on my sony vaio vpcz 133. It freezes after login into the system. So I go back and install the 12.04, works great. I'm planning to install the laptop mode tools on it. ...
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49 views

Is it safe to install kernel 3.6 on ubuntu 14.04

This question might sound stupid but pardon me as i'm still new to linux..but i've been having some problems with my Railink RT3290 Wireless driver and i'm running kubuntu 14.04.i've tried so many ...