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

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1k views

Is there a guide for using GRSecurity and Precisew/ PAX?

I'd like to know if there is a guide of some kind for (successfully) configuring, compiling and installing GRSecurity w/PAX etc. in Precise? I basically am trying to build my own custom release ...
4
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0answers
92 views

Ubuntu wifi usually not working on boot, needs kernel module restart

After installing Ubuntu on my netbook, an F205TA, wifi seems to be not working correctly. Usually wifi is not working after boot, but starts working after one or more tries of: sudo modprobe -r ...
4
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0answers
207 views

Why are the official/stable 4.* kernels marked unstable?

Kernel.org shows 4.1.1 and 4.1.2 as stable. Why then, are they named *-unstable/* here: http://kernel.ubuntu.com/~kernel-ppa/mainline/
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6k views

Failed to load ZFS module stack

Have been using zfs on linux (zfs-native/stable) raidz on 14.04 for several months without hitch and decided to move across some more important files as considered it trustworthy or I guess "stable" (...
4
votes
0answers
1k views

Wireless Dropping Out Using Intel 7260AC Card (Deauthenticated - Reason 7)

I have recently bought a new laptop and it has an Intel 7260AC wireless card in it. I am getting regular wireless dropouts occurring at no specific interval. AFAIK this only occurs at my house. ...
3
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0answers
112 views

Qualcomm Atheros AR93xx Wireless Network Adapter + Ubuntu 16.04 woes

NEWS: Added update 1 Added update 2 I am trying to build a new machine using the Gigabyte GA-970 G1 Gaming motherboard, together with a TP-Link TL-WDN4800 N900 Wireless Dual Band PCI Express ...
3
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0answers
100 views

16.04 - Slow Kernel Boot (LVM issue)

After upgrading to Ubuntu 16.04 my system boot slow down consistently To analyze the cause I used this command. systemd-analyze plot > boot.xml google-chrome ./boot.xml I have found out ...
3
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0answers
49 views

Ubuntu dropping USB Keyboard Chars

I bought a barcode reader which connects over USB and mimics a keyboard. Connecting to Windows, the barcode is read correctly but connecting to Ubuntu, it drops some repeating chars. It consistently ...
3
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0answers
31 views

enable parallel port interrupts/ access in Ubuntu 12.04

I need to interface a mid 1990s laboratory instrument to Ubuntu 12.04 for moderately high speed data acquisition ( 100 Usec) from the instrument . The instrument requires ( will not even run without )...
3
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0answers
131 views

Ubuntu 15.10: laptop reboots after suspend

When I open the lid after suspending my laptop, the laptop reboots instead of waking up normally. However, this only happens when it's on battery. This only happened today after Ubuntu performed some ...
3
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0answers
222 views

Ubuntu upgraded to 15.10, now laptop won't reboot

Samsung 400B laptop Yesterday I left my laptop upgrading to 15.10 (I think it was Wily something) about half way through. When I returned the laptop was hung with nothing on the screen. Hard ...
3
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0answers
61 views

Compile or Cross-compile open source driver for Aquaris E4.5 Ubuntu Phone

I am trying to connect an OTG USB-Ethernet adapter on the Aquaris E4.5 running kernel 3.4.67. The adapter is Cable Matters AX88179 which has open source drivers available for linux. The installation ...
3
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0answers
2k views

module verification failed: signature and/or > required key missing - tainting kernel

i am newbie in linux device drivers,after installing the driver in ubuntu 14.04 it showing the message module verification failed:signature and/or required key missing-tainting kernel for my module ...
3
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0answers
47 views

Why does 3rd digit in Ubuntu kernel version not match 3rd digit in its mainline upstream kernel version number?

From the Ubuntu Kernel FAQ ( https://wiki.ubuntu.com/Kernel/FAQ ) : Given an Ubuntu kernel package version how do we find the release it is from? The kernel package version is of the following ...
3
votes
0answers
287 views

Virtualization limits for Ubuntu Server 14.04 LTS with KVM

Essentially I'm after something like this, but for Ubuntu Server 14.04 LTS. I'm trying to create some KVM guests with very large 1TB+ RAM (through OpenStack Nova). I can boot the 1TB VM fine, but I ...
3
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0answers
600 views

Screen brightness issue Toshiba Portégé after 15.04 upgrade

I have a Toshiba Portégé Z30-A-13P. I can no longer adjust my screen brightness after upgrading Ubuntu to version 15.04 (Kernel 3.19). The screen brightness (as well as the touch-pad) didn't work ...
3
votes
0answers
577 views

Encrypted disk kernel warning - initramfs image won't boot

After an upgrade to 14.10 on my netbook, I can only manage to boot with the old kernel remaining from the previous 14.04 installation. For the most recent kernels, I get this warning when they are ...
3
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0answers
680 views

14.04 - USB microphone speaker device not working anymore

I own a PJP-20UR web conference microphone speaker, I have been using this USB device for ages with Linux, Windows, Mac never ever have had any issues with it. Since I upgraded from Ubuntu 12.04/12....
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0answers
586 views

Can't switch to Discrete GPU Hybrid Graphics ATI/intel

Just recently I had got my hybrid graphics working with DRI_PRIME=1. I obviously have the open source drivers. Now for some reason that I can't figure out it has stopped working. xrandr --...
3
votes
0answers
1k views

make [1] leaving directory error

When I run make command for patching CRCN on ns2 under Ubuntu 12.04, I am faced with this error: make[1]: Entering directory `/home/apadana/ns-allinone-2.31/ns-2.31/indep-utils/cmu-scen-gen/setdest' ...
3
votes
0answers
342 views

Why aren't my changes to /etc/security/limits.conf having effect?

I am trying to provide support for core dumps on my Ubuntu machine (as by default they are disabled). So I have made the following changes to /etc/security/limits.conf: root hard core 1000 After ...
2
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0answers
27 views

How to Downgrade kernel version 4.4 to 3.10

I have brought a TP-Link adapter TP-WN823N which work fine on Windows & Mac but they didn't provided drivers for Linux however I found drivers for linux but it is compatible only for linux(kernel ...
2
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0answers
31 views

Ubuntu 16.04 random freezes every few hours

I am using an old AIO PC with a core i5 and every few hours the pc just freezes and doesn't respond to commands, sometimes I get a message saying, BUG: CPU#3 stuck for 23s! In these cases the magic ...
2
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0answers
11 views

PPA upload of custom kernel package

Is there any documentation on how to build custom kernel packages and upload the result into a PPA? In particular, I would like to build mostly the stable upstream kernel (i.e. git://git.kernel.org/...
2
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0answers
53 views

Wacom Intous Art Support on Ubuntu 15.10 wily

Kernel: x86_64 Linux 4.2.0-36-generic OS: Ubuntu 15.10 wily DE: KDE5 So I have followed several articles online from several google searches such as: https://forums.linuxmint.com/viewtopic.php?f=...
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0answers
44 views

Problem with installing 16.04. Tried upgrading from 14.04

I am using 14.04 for a long time. Now today morning I tried upgrading to 16.04. All the packages were downloaded and installed. But after a few moments ( when I didn't pay attention to my laptop) it ...
2
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0answers
259 views

Kernel Headers not found error on installing NVIDIA cuda drivers on Ubuntu 16.04 LTS

just tired to install the NVIDIA cuda drivers on Ubuntu 16.04 (unsupported) but I get the following error: The driver installation is unable to locate the kernel source. Please make sure that ...
2
votes
0answers
243 views

16.04: Powering off discrete graphics results in kernel panic

I am trying to disable my discrete GPU, as I don't need the extra power and I'd rather have a longer battery life. I am currently using Ubuntu 16.04 with the 4.6.0-040600rc1-generic kernel and amdgpu ...
2
votes
0answers
41 views

Are modern Ubuntu installs compatible with ancient Kernel versions?

On Ask Ubuntu we occasionally see people with problems like: I'm running 10.04 Lucid LTS on my toaster. I'd like to upgrade but I have expensive proprietary hardware that only has drivers for ...
2
votes
0answers
92 views

X.Org does not work with a lowlatency kernel

I am using Ubuntu 14.04 with the 3.13.0-74-generic linux kernel, but I would like to use a lowlatency kernel. I have installed it using: sudo apt-get install linux-image-lowlatency And I have tried ...
2
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0answers
42 views

How to view signing algorithm of a loadable kernel module?

I am trying to read the signing algorithm(like SHA512) of a kernel module. I am using Ubuntu machine with Kernel (3.13.0-68-generic). I tried using modinfo command, but it doesn't tell me the ...
2
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0answers
124 views

Unable to fix kernel panic

I am expiriencing a kernel panic that doesn't let me boot regularly. I've been trying to solve it for two weeks now, but am still unable to. Hopefully you can give some clues. "Normal" boot exits ...
2
votes
0answers
579 views

alias nvidia_352_uvm to nvidia-uvm, opencl working only with sudo

I'm using the module nvidia-352 with bumblebee in my ubuntu 14.04. OpenGL programs are working fine with optirun. Nonetheless, bumblebee fails to load the module nvidia_352_uvm which is necessary for ...
2
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0answers
84 views

clearing old kernels has left black screen after login ubuntu 14.04 lts - help

If I have removed files unwittingly in a clear up of old kernels can I reinstall Grub or do something to recover my desktop ubuntu 14.04 gnome? Following instructions on how to clear out older ...
2
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0answers
658 views

Kernel not upgraded to 4.2.x

I upgraded from Ubuntu 15.04 64-bit to Ubuntu 15.10 64-bit but noticed that my kernel didn't upgrade and still shows: . $ uname -r 3.13.0-35-generic So I tried the following command to upgrade it ...
2
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0answers
699 views

Why ubuntu 15.10 still needs restart to update the kernel?

I upgraded my system to ubuntu 15.10 dev a while ago and the kernel was 4.2.0-14. A new update downloaded kernel 4.2.0-16 but "uname -a" still shows the current running kernel as 4.2.0-14. Linux ...
2
votes
0answers
682 views

Couldn't open module fglrx

I was using fglrx driver long ago, but I switched to open-source driver. In the Xorg.0.log I'm getting following warnings. [ 35.380] (II) LoadModule: "glx" [ 35.416] (II) Loading /usr/lib/xorg/...
2
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0answers
209 views

How do I sign my own kernel modules to avoid tainting the kernel?

I've made a kernel module, using this tutorial as an example. It works, but on loading I get a warning in kernel log: gdt_get: module verification failed: signature and/or required key missing - ...
2
votes
0answers
131 views

Bumblebeed and bbswitch error

I have a problem with my MSI-GS60 laptop under Ubunutu. I explain: First of all, with this laptop I had a wifi unrecognized issue. So I had found somes posts talk on that and I had finaly found a ...
2
votes
0answers
30 views

Redistribution of Ubuntu 14.04 LXDE

I wish to inquire about the intellectual property policy, where it is stated: You can redistribute Ubuntu, but only where there has been no modification to it As a commercial company with ...
2
votes
0answers
55 views

Debugging kernel running on AMD target from Intel host - how to return control to gdb?

I have compiled kernel 3.13.0-55 on Ubuntu on both AMD and Intel machines. I tried to copy compiled kernel to Intel target but it won't boot with that one. Therefore I have compiled the same version ...
2
votes
0answers
203 views

CPU hard lockup with Ubuntu 14.04 server on AMD machine

I have the following workstation configuration with 64 cores: 4x AMD Athlon 6378 2.4GhZ 128 GB Ram Supermicro motherboard H8QGI-F-O 2 x 512 GB SDD Samsung with software RAID-0 setup I am running ...
2
votes
0answers
1k views

Why aren't all of my CPU cores always detected in ubuntu 14.04 with an Intel Core Duo 2 CPU?

I'm using Ubuntu 14.04.2 LTS with kernel 3.16.0-38-generic #52~14.04.1-Ubuntu SMP Fri May 8 09:43:57 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux. Computer model: iMac Late 2009 ( https://support.apple....
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votes
0answers
1k views

Unable to find an initial ram disk that I know how to handle

After upgrading to the next linux image, aptitude has outputted the following lines: Setting up linux-image-3.16.0-38-generic (3.16.0-38.52~14.04.1) ... Running depmod. update-initramfs: deferring ...
2
votes
0answers
342 views

WiMAX in Ubuntu

About two weeks ago I asked a question about how to connect to WiMAX. And today I have done some research, and I want to share it with everyone. I don't know if this is going to be useful for someone, ...
2
votes
0answers
279 views

Slow boot on Ubuntu 15.04 during ACPI

The time seems to be wasted mainly between these two log lines. What could it be waiting for ? Apr 30 01:19:22 terodde kernel: [ 0.907820] [Firmware Bug]: ACPI: BIOS _OSI(Linux) query honored via ...
2
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0answers
279 views

Ubuntu 15.04 hang when boot virtualbox Centos 6

I have a freshly ubuntu 15.04 64 bit. A virtual box 4.3.26 r98988. And this image http://repo.scalefactory.com/vagrant/centos-6-x86_64-20.box Now everytime I try to boot the VM, my laptop hang. Here ...
2
votes
0answers
451 views

Dell e7440, sleep sometimes fails, kernel logs show ACPI errors

I have a new Dell Latitude E7440 with Ubuntu 14.04.2. Sometimes (but not always), after sleeping, I cannot resume, as after trying to resume one of the following happens: I can move the mouse but ...
2
votes
0answers
384 views

Undefined reference error while using custom system call in kernel 3.19

I'm trying to import new system call in the kernel 3.19. I've followed the tutorial given here! This is my simple code to implement factorial calculation via system call. #include <linux/kernel....
2
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0answers
357 views

Ubuntu snappy not booting

I'm trying to boot Ubuntu snappy on a BBB and after I've corrected the uEnv.txt as posted on ubuntu core webdm alpha for Beaglebone Black not booting it freezes at Starting kernel .... The full upboot ...