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

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207 views

How to get userID when writing Linux kernel module

Here is my function in my kernel module which I insert using insmod command after make at later stages. I am working on goldfish (2.6.29) asmlinkage long our_sys_read(unsigned int fd, char *buf, ...
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3k views

With Kernel 3.5.0-21 the wireless card Realtek RTL8723AE-BT stop working

Yesterday, I updated my Ubuntu 12.04 to the Kernel 3.5.0-21 and the wireless card stop working... In other threads I saw the same problem with another kernels. Anyone have the new driver? I sent a ...
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622 views

How to Choose default startup kernel ubuntu 12.04 with a GUI program

Is there any Gui program like the old startup-manager to control the default boot kernel behaviour in ubuntu 12.04? Thanks.
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439 views

Installation of Ubuntu 12.10 not sucessful in Samsung np100 notebook

After installation of Ubuntu 12.10 from USB made using the Startup Disk Creator, on new Samsung NP-N100S-E01IN notebook it does not boot. On booting the system just runs an update and stops with ...
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222 views

Ubuntu 12 installation problem

I have made about 30 copies of the Ubuntu installation CD, but there is no way to install it on my laptop. I get a black screen with a blinking cursor or I get a /casper/vmlinuz file not found or I ...
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441 views

Save kernel on Acer Aspire One270 with Ubuntu 12.10 - Booting Issues

I did search the forums for quite some time, yet did not find any answer to my problem... I have an Acer Aspire One D270 with Windows 7 Starter and I've installed Ubuntu using the Wubi installer. ...
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2k views

missing driver for smart card reader Ricoh Co Ltd RL5c476 II (rev b9)

Thanks for all who could help me to install a driver for smart card reader Ricoh Co Ltd RL5c476 II (rev b9). The driver is available here: Ricoh RL5C476 And according to ...
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208 views

How Grub top title can be changed

I am just wondering that 'How I can change the title on very top for Grub' - where it's written like 'GNU Grub version 1.99-21ubuntu3.4'? I am not asking for the menu entry, or to change labels of ...
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304 views

10.04 server won't boot off latest kernel

I'm maintaining a 10.04 server that is still booting off of the 2.6.32-28 kernel even though a bunch of later kernels are available. My best guess is that the immediately following version was purged ...
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675 views

Can't find “/sys/devices/system/cpu/sched_mc_power_savings”

I'm currently working on Ubuntu 12.04 x64. A lot of manuals about power saving in Linux tells about using parameters /sys/devices/system/cpu/sched_mc_power_savings and ...
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28 views

RE: specific item names in config files

Under a previous question 'Does Ubuntu use security features like DEP and ALSR' it was mentioned "if you aren't running a PAE kernel, or your hardware lacks the NX bit, Ubuntu emulates the NX ...
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2k views

VMWare virtual machine won't boot after 12.04 upgrade

I was running an 11.10 virtual machine on VMWare Workstation 7.1.5 build-491717. I tried to upgrade the other day to 12.04. After everything was downloaded and installed, the system asked to be ...
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491 views

Screen dim buttons not working on Toshiba Satellite

Since I have upgraded from the last 11.10 to 12.04 the screen dim buttons ceased to function. As I see this is due to the replacement of the 3.0 kernel with the 3.2 starting the system with the 3.0.19 ...
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1k views

intel atom getting too hot

I own an Asus 1215N which is getting very hot Intel Atom 525D dual core ION 2 (geforce 220 + GMA 3150) 4 GB RAM Ubuntu 12.04 it hits 86 C at idle. Some times (at load or turned on > 1 hour) it shuts ...
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402 views

How do I set up a server with a realtime kernel?

I have installed ubuntu server 11.04 on a machine with size 4GB. As, the ubuntu server 11.04 does not support real time kernel by default, I need compile a real time kernel on ubuntu desktop 11.04 ...
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41 views

getting error when inserting driver module

error as can not be read private key when I install driver Realtek driver module to linux ubuntu 14.04 (3.13-.0-32-generic) how to resolve this problem . can i downgrade my kernel version of current ...
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81 views

Ubuntu 14.04 Black screen nvidia driver 347. taints Kernel?

My pc, gtx 750 with nvidia 347 driver ubuntu gnome 14.04, boots only to black screen. When I look into the /var/log/syslog I get this error with the nvidia driver. nvidia: module license 'NVIDIA' ...
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49 views

Can't update kernel version because dpkg has an error everytime

I'm quite new to Ubuntu and want to upgrade my kernel to a newer version, but everytime I try I get the same error: Selecting previously unselected package linux-image-3.8.0-030800-generic. (Reading ...
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1answer
13 views

Do I need to install kernel source to apply a patch?

I'm using Ubuntu 14.04 with Linux version 3.16.0-30-generic. I've installed Beignet for OpenCL support. I'm running into some errors and the Beignet documentation says to resolve them by applying this ...
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1answer
48 views

CPU frequency control

I have a kubuntu 14.04 with the latest HWE kernel (3.16.0-31-generic), and a Xeon 1246v3 processor (which is basically an i7 4770 with ecc support). The processor has base frequency of 3.5 ghz, and ...
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1answer
54 views

Ubuntu 14.04 is totally broken, how can I reinstall from a new disk?

I tried updating my kernel (intel pentium processor, Msi r7 260x graphics, Ubuntu 14.04) and now my computer will boot and display a black screen and a pop up saying the stored configuration for ...
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29 views

Tried Ubdating Kernel; Now, Desktop won't load on startup

I get a blank black screen and a message that says "could not apply the stored configuration for monitors required virtual size does not fit available size" and says it can't use 3840xy and it's ...
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1answer
12 views

Cannot disable kernel updates on 12.04

I have Ubuntu 12.04 LTS. Update manager will try to update the kernel version, unfortunately this causes issues with certain applications/drivers I use. Each time I have to manually deselect the ...
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1answer
34 views

Meaning of kernel WARN_ON

tailing /var/log/syslog for apparmor denied messages, I came accross this never ending warning: Mar 10 09:35:43 franck-ThinkPad-T430s kernel: [ 2216.247652] ------------[ cut here ]------------ Mar ...
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41 views

Why is preemption disabled by default for a desktop edition?

I am using ubuntu 14.04 and i am using just the kernels that came with distro (version 3.16.0-31-generic). I checked /boot/config-3.16.0-31-generic, it says # CONFIG_PREEMPT is not set (and it does ...
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31 views

Is it possible to use windows drivers in Ubuntu?

My KWorld UB430-AF dongle stopped working over 1 year ago. An Ubuntu user detected and then reported a kernel issue as the source of the problem (regression of kernel drivers): ...
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1answer
119 views

VMWare Player 3.1.6 32 bit installed with Ubuntu 14.04

Dear Ubuntu spezialists, I use Ubuntu 14.04 on an old 32 bit netbook. Now I installed VMWare 3.1.6, since this is the last real 32bit VMWare Player (although there seem to be newer versions of the ...
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1answer
27 views

Need Help to troubleshoot building of custom kernel on Ubuntu 14.04

I need some help about building a custom kernel on Ubuntu 14.04 (Trusty Tahr). It is not my first time to compile kernels, but I faced the problem to build only on Ubuntu 14.04. When I try to build ...
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1answer
46 views

Compile kernel module? (Live USB)

is it possible to compile a kernel module on a live USB stick with Ubuntu 14.04 LTS? I have now tried for hours but all my attempts have failed. What i've done. Installed the linux headers. Created ...
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1answer
259 views

Can't build Virtualbox-dkms - mismatched kernel and headers

I have previously used VirtualBox on my Ubuntu 14.10 machine, but I had not used it in the last two months. When I tried to start a VM, I got the following error: WARNING: The character device ...
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1answer
142 views

Unable to compile INTEL 82599 driver on Ubuntu 14.04

I am trying to compile the drivers on my machine and I am getting the following errors: ~/ixgbe-3.21.2/src$ make install make -C /lib/modules/3.13.0-46-generic/build ...
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1answer
87 views

System Settings Missing/Bluetooth Settings/Sound Settings/Programs Missing?

Not sure what happened but all my settings are missing, I cant access any to make changes. When check under the dash not of the settings are showing as been instilled. Not only settings but some ...
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1answer
84 views

Black borders around windows/apps missing from dash after kernel update on Ubuntu 14.04

I'm having some weird issues with Ubuntu 14.04 64-bit. I updated the kernel to 3.18 (or at least I think I did...) using this guide here: ...
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1answer
61 views

bluetooth indicator and other settings not working after updating kernel to 3.16

So, today there was this update for the Kernel to 3.16 on LTSEnablementStack. I ran the command for the update. I notice that a lot of packages are removed, like the bluetooth indicator, but it seems ...
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1answer
59 views

Kernel Panic after upgrade to 14.10

My new kernel panics and won't boot after upgrading to 14.10. The output with a stack trace is fed to the screen, but I can't roll up, so I don't know what the problem is. I can boot if I use the ...
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1answer
14 views

Loading Session Applications

How does Ubuntu Load previously opened applications on startup? (I want to code and modify that functionality present in the system preferences manually )
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1answer
56 views

Double (different) key press detected

I have Windows 8 and Ubuntu 14.10 as dual boot. I have PS2 keyboard. Sometimes randomly (can't reproduce yet) Ubuntu detects multiple different key presses when I press specific buttons. Some buttons ...
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1answer
132 views

How do I get into recovery mode on ubuntu 14.04 if the option not showing

I just boot up my laptop then run the sudo apt-get update command, but there's an error says [username] is not in the sudoers file. This incident will be reported. .so I search the google for ...
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1answer
19 views

Kernel problem on TOSHIBA

I have a SAMSUNG with following specs Intel® Core™ i5-3210M CPU @ 2.50GHz × 4 Intel® Ivybridge Mobile 8 GB internal memory Ubuntu 14.04 64 bit Since quite some time now, my list of kernels ...
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1answer
417 views

Upgrading to 3.18 kernel causes wireless not to work

So I got the 3.18 kernel working on my system (I can boot into Unity now: hooray!). Unfortunately, this seems to have broken my wifi. Wired ethernet is still working, but Network Manager isnt ...
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1answer
482 views

Upgrading from kernel 3.13 to 3.18 causes Unity not to load, wireless not to work (System specs included)

SYSTEM SPECS: Macbook Pro (64 bit), Ubuntu 14.04, kernel version: 3.13, graphics drivers: nvidia-331 Recently I've been experiencing wi-fi problems on a regular basis in 14.04 with kernel ...
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1answer
161 views

Kernel panic while installing CentOS 7 in VirtualBox

I have a laptop with Xubuntu desktop 14.10 , and I installed VirtualBox and updated it to the latest version . I'm trying to install CentOS 7 (source downloaded from the official site) as a VM, ...
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1answer
89 views

12.04 LTS: Kernel Update to 3.13.0-44 broke my-weather-indicator

After doing the kernel update today, my-weather-indicator disappeared from the indicator bar on my 12.04LTS boxes. If I try to start it manually, the icon flashes in the launcher for a couple of ...
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1answer
34 views

Local version during kernel build broken

I'm trying to build a custom variant of the 3.13.0-43 kernel on Ubuntu 14.04. Following the normal procedure (directions posted at https://wiki.ubuntu.com/Kernel/BuildYourOwnKernel) is not working for ...
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1answer
24 views

Kernel Panic on xubuntu toughbook cf-19

I'm on a toughbook cf 19 xubuntu and I have a kernel panic about 10 times a day. Do you know what can be the problem?
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35 views

Trouble loading kernel 3.18

I received 3.18 in apt update but it does not show up on recovery list and I cant seem to get the missing parts. How do I get 3.18 to load?
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1answer
75 views

radeon dpm: why my power state 0 has high values which are not aligned with dmesg?

# cat /sys/kernel/debug/dri/64/radeon_pm_info uvd vclk: 0 dclk: 0 power level 0 sclk: 37500 mclk: 150000 vddc: 950 vddci: 875 pcie gen: 3 # cat /sys/class/drm/card0/device/power_dpm_state ...
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1answer
68 views

How to remove kernel?

I have installed two kernel version 3.10.48 and 3.17.6 for project. As I am not requiring 3.10.48 any more, I wanted to remove that version as it is taking up almost 10GB of my disk space. How should ...
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1answer
168 views

Where can i find linux 3.8.11 kernel image in order to build wacom drivers for Samsung Chromebook 2

New to Ubuntu/Linux, so please bare with me. My setup: Samsung Chromebook 2 -> running Ubuntu via crouton (trusty with KDE). Im in the process of installing the Wacom Intuos drawing tablet, and i ...
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1answer
123 views

Right way to completely clean up old kernels in terminal

I have been going through various questions about how to clean up old Linux kernels. They all seem to have different answers and they are old, so someone is bound to say the question is too old and ...