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

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20 views

System doesn't start on one kernel version

I have a weird problem. I've recently installed quite much different stuff for GPU and network card, I also updated the kernel many times. I don't know how many of them was actually necessary. And ...
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30 views

Grub2 Add Kernal Boot Flags

In grub I need to add kernel flags to one entry but not another. I plan on doing this by adding a custom boot loader. If this is the script I plan on using to boot the OS, where do I place the kernel ...
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17 views

Netem command for GE Model

Am using Netem commands to check network impairments, In this regard I would like to use Gillbert Elliot model to check the loss pattern. Some where I found a command like this, tc qdisc change dev ...
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129 views

'Remix' Live CD won't boot. Kernel panic - not syncing: Attempted to kill init

So I'm creating a Ubuntu Remix CD based on this guide: https://help.ubuntu.com/community/LiveCDCustomizationFromScratch I'm pretty sure I've followed all of the tasks listed there. I move the test ...
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49 views

kernel-panic related to Asus sd-card-reader

I've just observed the same kernel panic 4 times on 2 different notebooks: Asus N550JV (running Linux Mint 16 ~ Ubuntu 13.10) Asus Zenbook UX32VD (running Linux Mint 17 ~ Ubuntu 14.04 LTS) These ...
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105 views

Ubuntu Kernel Update 3.13.0-43 causes graphics problems and Kernel Panic

So when I did an update through the terminal to kernel 3.13.0-43, and I rebooted my system - it booted but it only had one resolution, 1024x768, when that's not even my largest resolution (my largest ...
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39 views

uvd not responding… cant start ubuntu

I am new to ubuntu. When I installed (stand alone) ubuntu 14.04.1 on my laptop, it wont load and it shows error that uvd not responding a few times and then shows uvd not initialized and hangs I tried ...
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36 views

free space in boot for upgrade to 14.04

Can not upgrade to 14.04. Not enough free space in /boot again. No obsolete kernels detectable. What gives? :~$ ls /boot/ abi-3.11.0-13-generic initrd.img-3.11.0-26-generic ...
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10 views

how to avoid loosing kernel changes throgh updates?

I'v modified kernel to enable SPIDEV on Pandaboard Ubuntu. Unfortunately I am loosing this devices every kernel update. Is there any posibility to avoid it, so I do not need another day to compile the ...
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7 views

linux modules do not autload after updating

I did apt-get update and since that moment, something in config files probably changed, however since that moment modules in my kernel (kernel wasn't updated) do not autoload. I have to manually load ...
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32 views

How to upgrade/ remove recompiled kernel version in Ubuntu 14.04?

I m working on process migration and for adding extra utilities, I recompiled my previous kernel version 3.13.0-24 generic to 3.10.48. Now I want to install Checkpoint/Restart tools (CRIU) which are ...
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56 views

.conf in /etc/modprobe.d does not work [14.10]

I have that horrible buzzing sound in my left headphone (it's the same in windows, I think it's a hardware defect) so I want the sound chipset to automatically power off to get rid of that buzz sound ...
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30 views

Terminal command to send an interrupt to mimic a new peripheral device connection?

Is there a way to send an interrupt indicating a connection of a new peripheral device? Looking for a standard user command that could perhaps mimic ps/2 mouse connection. My mouse keeps ...
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25 views

Which part of the kernel powers on/off USB ports? How - the internals?

Please refer to this post: Power on/off USB ports . It is one thing to blindly replicate the codes in a terminal and get the desired results. I wish to know which part of the kernel does this work, ...
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53 views

Header file for struct proc_dir_entry

I'm writing a firewall for the Linux kernel and I'm using the proc_dir_entry data structure (which I've found in the tutorial I'm currently reading). My firewall is conceived as a kernel module but ...
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77 views

Ubuntu 14.04 : Core 2 Duo : System wont boot when Multi Core processing is enabled

I belive you guys are having good time. Well i am not!! I got an annoying problem with my Laptop(Thoshiba L310). She wont boot if Multi Core processing is enabled. On booting, just before i enter the ...
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69 views

Hard Disk SMART Attributes FAILING

I have a dual booted lenovo ideapad z510 computer - windows 8 and ubuntu 14.04 (mainly used). Since a few days, while I go into ubuntu, errors of not able to read from hard disk , kernel panic , etc ...
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61 views

Use new 3.16 kernel alsa firewire with qjackctl

I just upgraded Ubuntu studio to 14.10 with 3.16 kernel on a 2008 MacBook because it should support a lot of new firewire audio devices natively in alsa. I plugged in my Behringer ufx1204 with its ...
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74 views

Ubuntu 14.10 Kernel boot problem

yesterday I installed 14.10 on my laptop. Everything worked fine I installed the proprietary nvidia drivers and updated my intel graphics drivers. I rebooted after that and everything worked. Today I ...
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48 views

Kernel messages scrolling over Grub background image during boot?

I display a Grub custom background image at boot time(Ubuntu 14.10). I would like this background image to stay in place during the kernel startup and to scroll the kernel messages over the Grub ...
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25 views

No Wireless drive detection in new built kernel for reverse bisecting

I need to do a reverse bisect for a bug and I narrowed the versions down to two. Now, I need to build a 8 new kernels. However, when I built them, the kernel cannot detect my wifi drive so that I can ...
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100 views

Problem installing NVIDIA drivers - mismatched kernel files(?)

This question was more long-winded than planned. In summary, I'm having trouble upgrading to cuda-6.5 with Linux 14.04. I think it's because I have some files for linux-kernel 3.11 and others for ...
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14 views

Is there a backport of ulogd2 for 12.04 precise?

I have a server with Ubuntu 12.04 running on Rackspace cloud, configured to use the latest kernel. A week ago or so I rebooted the server and it booted on a new kernel 3.17.1 (that had been released ...
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102 views

Lubuntu kernel headers configure

I get this error: ERROR: The kernel header file '/lib/modules/3.13.0-39-generic/build/include/linux/version.h' does not exist. The most likely reason for this is that the kernel ...
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20 views

PCIE module options

Exactly after last kernel upgrade, my HDD started to make errors, switch to Read-only operating system, etc. I'm using a PCIE card to connect this SATA2 HDD to my Ubuntu Server. dmesg lists some ...
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29 views

How to deal with very frequent failure to inform the kernel about modifications to partition?

Moving multiple ext4 and vfat partitions in gparted 0.19.0 on Ubuntu 14.10 constantly causes Error informing the kernel about modifications to partition /dev/sda13 -- Invalid argument. This means ...
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35 views

Kernel Tuning Tools?

How to improve performance of a Kernel ? Are there any tuning tools to improve Kernel performance ? Thank you.
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8 views

What does it mean for /proc/kpagecount to be zero

for some entries in /proc/kpagecount, all the 64 bit entry is zeros and yet the page is allocated (confirmed from /proc/kpageflags). What does it mean for kpagecount to be zero for certain physical ...
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17 views

My kexec is broken with Utopic Unicorn

I am unable to do proper warm reboots with kexec since the release upgrade to Ubuntu 14.10 on my Lenovo ThinkPad T410. When I get to Starting new kernel..., the system does a cold reboot (full reboot ...
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132 views

Ubuntu frustrating crash

I am experiencing a freeze once in a while. When my computer freezes, only the mouse can move but it cannot click anything. In addition, I cannot switch to terminal using alt + f1 or ctrl + alt + ...
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43 views

Upgrading Kernel Breaks Several Features

I've recently made the switch from Windows to Ubuntu 14.04. I'm sure you can imagine my excitement when I started the OS, and found it to be almost completely ready to go out of the box! After a few ...
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33 views

Error after start instalation

Can this be disabled? thx for any help
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136 views

Dell 5737 freezes on ubuntu14 everytime during resume from suspend

My dell 5737 laptop was running all fine on 12.04. As soon as I upgraded to 14.04 I am consistenly running into system freeze everytime system attempts to resume from suspend. This happens when I ...
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17 views

Modules in /proc/modules address issue

If I cat of the /proc/modules the RAM address location of modules is always 0x0000000000000000. Any ideas? vmnet 51316 13 - Live 0x0000000000000000 (OX) parport_pc 32701 0 - Live 0x0000000000000000 ...
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28 views

How do I implement multiple keymaps into a kernel?

my problem is as follows: I have a custom-made kernel that has no functionality in regards of changing the keyboard mapping. It is possible to compile a different keymap into it, but that's it. The ...
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58 views

Unable to boot Ubuntu 14.04 on Dell Precision T7500

I tried to install Ubuntu 14.04 64-bit on my DELL Precision T7500 workstation. But even after trying for many times, the installation process hangs in between. So I installed Ubntu 13.10 64-bit. Later ...
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72 views

Kernel panic Ubuntu 14.04 kernel 3.13.0.39

When booting the computer I get the message kernel panic. I reboot the computer, and on this second boot I get the screen where I can choose kernel versions. If I choose kernel 3.13.0.3 generic the ...
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35 views

Circumventing MacBook Pro's motion sensor using /dev/input/js0 as a joystick

I'm on a MacBook Pro 8,1 running 14.04 and I've never plugged in any device with a joystick to my laptop. When I was trying to fix an input problem I was having, I checked /dev/input/js0 thinking that ...
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167 views

ubuntu 14.10 shows kernel panic error on startup after upgrade from 14.04

i upgraded from 14.04 to 14.10, when prompted by the system update utility during the upgrade some packages did not install properly / gave errors (i cant remember which packages) after restart it ...
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50 views

How to resolve the kernel panic problem of my ubuntu os?

The system has crashed (kernel panic) several times where a black console screen appears (figure below) displaying "Kernel panic.. switching back to text console" & the system freezes (requiring ...
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292 views

grub rescue> unknown command “kernel”

I have Ubuntu 12.04 installed on my laptop, everything worked fine, but today I got this message: error: hd0 out of disk. grub rescue> This happened to me before, and usually I solved it with ...
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32 views

Disable psmouse add start up using modprobe

My touchpad just doesn't work and acts strange so I have to disable it with sudo modprobe -r psmouse every time I boot into Ubuntu. But how can I make this change permanently and no need to re-enter ...
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138 views

LVM VG is not activated during system boot

Since upgrade from Ubuntu 14.04 to 14.10, one of my VGs doesn't come online when the system boots up, and unfortunately, this VG has my root FS, thus I'm dropped to the initrd BusyBox prompt. ...
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132 views

How to install usbserial and ftdi_sio modules to 14.04 Trusty Vagrant box?

I started a Vagrant box from https://cloud-images.ubuntu.com/vagrant/trusty/current/trusty-server-cloudimg-i386-vagrant-disk1.box. For some reason, this box does not seem to include usbserial and ...
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15 views

What does it mean if kern.log is not being updated?

Ubuntu 14.04, all up-to-date, KDE desktop. I went to mount a USB drive, but noticed that the icon for the drive wasn't there on the desktop. I did a sync (just for safety) and then removed the USB ...
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227 views

how to control overheating of acer aspire 4736Z laptop in kernel 3.13.0.37 ubuntu 14.04LTS

I have an Acer Aspire 4736Z laptop having Ubuntu 14.04LTS installed, recently it updated to kernel version 3.13.0.37. Now its always get heated lot, I think its FAN gets off, Even I have checked the ...
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188 views

Gave up waiting for root device (and cannot find drive from usb live)

I am seeking help for a typical problem for which I have tried many solutions. The typical problem is the Gave up waiting for root device. Common problems: - Boot args (cat /proc/cmdline) - ...
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840 views

signature and/or required key >missing - tainting kernel CrystalHD

I am running Ubuntu 14.04 32bit under Gnome on my plastic 2007 Macbook. The old laptop is still going strong, but I wanted to lesson the load on my cpu on video files. To do this I installed a ...
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33 views

How do I update a Intel536ep fax/winmodem driver installation for a newer kernel?

So I want to use my legacy PCI cards and USB winmodem on my Ubuntu 14.04, but I only found information for older kernels. What are the steps for this update/fix ? Please be helpful (step-by-step) ...
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75 views

How do I get and remove the kernel source code?

So after I read How do I get the kernel source code? apt-get source linux-source-x.y.z but what if I issued a "sudo" of the last command in the /usr/src, how do I remove it (uninstall) ? Do I ...