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

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248 views

Cloning an encrypted hard disk to a different computer

I'm using 12.10 with full-disk encryption. Can I clone my full-encrypted hard disk from an old laptop and write it, as-is, to a new laptop and expect everything to work correctly right away? If there ...
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279 views

CK Kernel For Quantal Quetzal?

Are their any pre-compiled kernel packages for Ubuntu 12.10 that provide the CK patchset, or at least the BFS scheduler?
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225 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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628 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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440 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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312 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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689 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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503 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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409 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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29 views

Installed new kernel on Ubuntu 12.04. How do I start it?

I installed linux-image-3.12.24-031224-generic on Ubuntu 12.04 but cannot find a way to start it. uname -r still says 3.2.0-80-generic. $ dpkg -l | grep linux-image ii ...
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50 views

why does /proc/cpuinfo show a single processor on the BQ Aquaris phone?

phablet@ubuntu-phablet:~$ cat /proc/cpuinfo Processor : ARMv7 Processor rev 3 (v7l) processor : 0 BogoMIPS : 2072.57 Features : swp half thumb fastmult vfp edsp thumbee neon vfpv3 tls ...
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1answer
106 views

Ubuntu 14.04 freezes

I have Ubuntu 14.04. After having updated the system to kernel 3.13.0-49-generic, I re-booted and now everything freezes! I can not log in. (Keyboard and mouse do not work as well) I found this line ...
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74 views

How to upgrade the kernel correctly?

Running uname -r in a terminal gives an output saying 3.13.0-37-generic, but I am trying to upgrade the kernel to 3.16, and indeed I have ran sudo aptitude safe-upgrade which installed ...
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22 views

Ubuntu Touch Kernel Config [easy question]

I'm in the process of porting Ubuntu touch. Based on the porting guide, https://developer.ubuntu.com/en/start/ubuntu-for-devices/porting-new-device/#anchor4 I would like to know which kernel is it ...
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24 views

how to check if zfs is using the kernel module

I am having perfomance troubles (transfer rates only about 50MB/s using 6 2TB server hdds WDC WD2003FYYS, each doing app 150 MB/s) with my raidz and was hoping to increase it with the ZFS on Linux ...
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48 views

Changing kernel driver from wl to b43

im running on ubuntu 14.10 and i want to change my wireless kernel driver from wl to b43. is there a step by step procedure to do this? here's my adapter info. i run sudo lspci -k 08:00.0 ...
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61 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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157 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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1answer
82 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
19 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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62 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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1answer
32 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
16 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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46 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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59 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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1answer
34 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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176 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
42 views

Why is there no /proc/sys/kernel/softlockup_thresh

and, more importantly, how can I adjust this threshold for Ubuntu 14.04 server installations? I have standard Ubuntu 14.04 server VMs crashing due to CPU softlocks and VMWare recommends adjusting ...
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1answer
32 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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58 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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384 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
196 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
107 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
103 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
75 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
76 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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171 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
24 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
506 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
544 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
42 views

Installation Error :(

I tried Ubuntu 14.10 (64 & 32 Bit) & Ubuntu 12.10 (64 & 32 Bit) I get this error every time I select & entered "Install Ubuntu" I am installing Ubuntu using a USB [21.317787] Kernel ...