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

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Very weird behaviour when signal sent from Kernel to UserLand Process

So I am sending a SIGUSR1 signal from a LKM to a userland process. Assuming I have the PID of the user-land process, here is the relevant code from the LKM: void s3f_send_signal(struct task_struct* ...
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20 views

Are systemd fixes backported?

My initial Stackoverflow question is: here. Launchpad bug #1333140 here indicates a fix has been produced (thank you to all involved!), see extract below. systemd (218-10) experimental; ...
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29 views

Block device drivers for linux kernel > 2.6

I am new to drivers development under linux kernel. After starting with the simple examples from the book Linux Device Drivers v3, I realised that the block driver API has been totally changed since ...
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36 views

Boot DVD failed w/Kernel panic - not syncing: Fatal exception in interrupt

Trying to install Ubuntu 14.04.1 LTS This is a brand new ASUS w/ Windows 8 pre-installed. I'm not trying to do a dual boot or anything. I've searched the forums and google and have already disabled ...
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36 views

Kernel Headers 3.10.18 not found in VMware Kernel Module Updater

I had Ubuntu 14.10 and VMware Player 7.0.0 installed on my Acer Chromebook 11. Wwhen I open VMware, I get the exact same error message as mentioned this thread - "What is the path to the kernel ...
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32 views

Compiling the Davicom driver on RK3188 chipset

I want to compile the module dm9601.c for ubuntu 14.04 on the mentioned chipset. I have read up the tutorials of Ian Morisson, e.g. here and here. I am also failiar with this. On an MK802 IV ...
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149 views

black screen since kernel 3.13.0-45 on ASUS F200M

My Asus F200m is running Kubuntu 14.04 LTS for a while : Every thing is perfect and it seems it uses Intel 7th Generation CPU and Intel HD Graphics. Then a kernel update to 3.13.0-45.generic and now ...
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10 views

T9 keyboard using numeric keys

after bought an gamer mouse, that have 12 numeric keys at left side, i was wondering how to do an T9 keyboard to use that keys on ubuntu? I'm working with java but can't figure out how to integrate ...
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37 views

Cannot compile kernel?

I recently re installed my ubuntu and got it updated to 14.1..it has a generic kernel 3.16 as we all know..however, when I started to compile the kernel 3.19(downloaded from the official site) the ...
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55 views

Firefox crashes not due to plugins-latest FF on Ubuntu14.04

Firefox ver35.0 crashes after running videos for a while or even after seeing many .Gifs on Ubuntu 14.04 I have reinstalled FF and Ubuntu too. No luck. One window says; Must restart FF. Other window ...
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14 views

SCHED_BATCH policy for schedtool in Ubuntu 14.04

The INSTALL file of schedtool says that the SCHED_BATCH policy (-B) is implemented in kernels 2.6.16+. However, I am unable to use this policy in Ubuntu 14.04 (kernel 3.13.0-45)? The output of ...
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20 views

<AUDIO> Sharp blips and noise after kernel upgrade

I recently built and started using 3.14.22 kernel instead of default Ubuntu kernel 3.5.57 (that came pre-installed) on my laptop. With this new kernel I get buzzing noise in headphones continuously ...
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23 views

Openstack + Ubuntu Utopic/Trusty + nr_requests

Anyone know why ubuntu utopic/trusty doesn't allow to change nr_requests and I/O scheduler for instance that is running on the cloud using openstack? echo 129 > /sys/block/vda/queue/nr_requests ...
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33 views

Driver is automatically removed after kernel update

I had a problems with old wi-fi driver, so I have installed newer package, downloaded from the internet. Each time I had updates for kernel - this driver was removed after reboot, so I manually ...
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15 views

Is it possible to reduce the v4l source tree to just the modules I need?

I have a PVR card that needs a number of custom-built modules from linux-media (aka v4l). These are linked to the current kernel so every kernel upgrade, I have to set put the computer in a trance ...
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9 views

Can't read trace of tftpboot kernel panic - too long

I am trying to install a new kernel using tftpboot. When the kernel is loading, it throws a stack trace. It locks up the system so only a hard restart will work. Shift-pgup will not work either. It's ...
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27 views

put ALSA as module ERROR

I've got a problem. I have to enable on my kernel ALSA from built-in to Module because I need to install Realtek linux driver for ALC260. If I change it in my kernel configuration and I run make ...
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11 views

kernel.yama.protected_nonaccess_hardlinks is an unknown key

I want to clear the snapshots of Cassandra using : nodetool -h localhost -p 7199 clearsnapshot but it gives me an exception : Exception in thread "main" FSWriteError in ...
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27 views

Difference in scheduler, 64-bit vs 32 bit

So I am working on a fairly new linux kernel (3.10.9), and I was wondering if there was a difference in the way the scheduler works from 32 bit to 64 bit. I am wondering because I am running a ...
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162 views

VirtualBox for Ubuntu 14.10 Kernel driver not installed (rc=-1908)

I have this error message: Kernel driver not installed (rc=-1908) The VirtualBox Linux kernel driver (vboxdrv) is either not loaded or there is a permission problem with /dev/vboxdrv. ...
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51 views

how kernel gets upgraded on ubuntu 14.04 installation?

There are linux-generic and linux-image-generic packages, that track latest linux-image package as their dependency. Those packages could be used to update kernel automatically but they aren't ...
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19 views

get kernel panic log

My system keeps hanging every several hours. I think the problem is somehow connected with network, because plugging ethernet cable eliminates the problem (even if ethernet is used locally only). If I ...
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24 views

kernel panic not syncing attampt to kill init

I'm getting kernel panic error in kvm machine, kvm machine is on lvm storage and we can't boot vm's from CD or DVD. so please help me out from this problem. please find the attached scree shot for ...
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18 views

Logitech USB headset holding up parts of boot process

I am having problems with my Logitech USB Headset. When I have my headset plugged in when I turn on my computer, it takes longer to boot than usual. When I log in, all fonts are not anti-aliased, the ...
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20 views

Boot fail running 14.04 - have boot-repair pastebin

Not sure where next to turn I've tried boot-repair and been given then the pastebin info http://paste.ubuntu.com/9972046/ The error message is that /dev/mapper/ubuntu--vg-root can't be found I can ...
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16 views

How can I modify the Ubuntu-12.04 Server ISO to include non-default kernel and headers (lts-raring in my case)

I have an ISO which I am customizing via preseeding. I am able to customize it from the preseeding point of view but I want to do a little more. The ISO image I am using is the standard ...
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42 views

Boots from old kernel

Ran software update from Manager (Linux-3.13.0-44 is newest). When it finished, I went to Grub Customizer to remove old kernel listings. (Don't always do this, so I had kernels 3.13.0-32, 36, & 43 ...
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64 views

unable to delete older kernel image files & folders in Ubuntu 12.04

Prior to posting I have made attempts to find the answers among existing posts, however I was unable to find anything which worked. I am trying to clean up a HD which has only 4GB of free space. On ...
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41 views

swap memory value / percentage meaning

Swap memory can be set between 0 to 100 What Does It means when we set swap memory to .. ? swappiness= 0 Tells the kernel to avoid swapping processes out of physical memory for as long as ...
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8 views

Compiling and installing a 32-bit kernel on a 64-bit linux

I compiled 32-bit kernel on a 64-bit ubuntu and installed it. But when I tried to boot from it , it gave me an error: Failed to execute /init Kernel panic - not syncing: No init found And ...
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185 views

udev and eMMC rpbm partitions

I'm running into this bug: Fix udev rules to consider mmc rpmb partitions and trying to solve it using a udev rule. I haven't needed to learn anything about udev in the past, so have been reading up ...
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228 views

Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b

The server suddenly became unusable, I tried a reboot and it fails with the same kernel panic. I booted with splash and quiet removed. This is all I have: Begin: Running /scripts/local-premount ... ...
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16 views

X-cursor size decreased after Linux kernel upgrade

Compositing doesn't work well in ubuntu-mate 14.04 in kernel 3.13 so I upgraded the kernel to latest 3.19-rc5 where it works awesome. However, my xcursor's size has diminished. I tried changing ...
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34 views

Binding device to a driver module

I'm trying to understand better the process of binding a device to its driver. I have an USB tool (In System Programmer for Arduino) whose Id (Product and Vendor) are known. The driver, cdc_acm.ko, ...
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16 views

What does “acpi_pm” mean?

While researching clock source kernel parameters, I came across the following terms: tsc hpet acpi_pm If someone could tell me what acpi_pm is as the other two I found googling around.
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70 views

/lib/modules/3.8.13/build folder missing

I am installing a Wi-Fi driver on to my BeagleBone Black with Angstrom running. As I was compiling the driver I got this error root@beaglebone:~/Desktop/WLAN-AIO-OSR/build# make BOARD_TYPE=arm ...
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30 views

How to build extra kernel package that contains aufs.ko module?

How to build extra kernel package that contains aufs.ko module? Thanks. We used these options which did not generate linux-image-extra package for our flavor. AUTOBUILD=1, full_build=true
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38 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 ...
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37 views

Missing initramfs from usb boot drive

Every time I try to boot up an Ubuntu distro on my laptop (11.10, 13.04, 13.10, 14.04, 14.10) I get this kernel panic message on boot: Kernel panic - not syncing: VFS: Unable to mount root fs on ...
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104 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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72 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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36 views

FlexMAC and Madwifi installation problem for Atheros WLAN Device

I'm trying to install FlexMAC to develop WLAN 802.11 specific protocol. I'm using Ubuntu 12.04. Machine configuration: root@f:/home/f/madwifi-0.9.3.1-FlexMAC-RA# lscpu ...
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35 views

Bad kernels upgrade, and it is impossible to delete them

I have a huge problem on my Ubuntu 14.04. It runs an 13.3.0-39 kernel. A while ago I wanted to update the kernel via Synaptic to 13.3.0-40 and 13.3.0-43. Unfortunately, the kernel upgrade did not ...
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43 views

boot to ram, squashfs filesystem and custom kernel

I am trying to boot my Ubuntu based custom linux OS to ram. I compile the kernel from scratch, so it does not have aufs or unionfs. I don't want to patch the kernel. It seems the live-boot-tools ...
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29 views

Kernel Error Message when installing /demo/repair

I got this error when trying to install /demo/repair disc for Ubuntu 14.10
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30 views

Kernel panic occured in Ubuntu Trusty tahr i386

I recently downloaded the i386 version of Ubuntu 14.04 and tried using it from a live CD (I burned). But while loading, I saw the message Kernel panic occured switching back to text console. But ...
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57 views

Dual Boot Ubuntu from USB on a Mac: “Loop not found” and “Load Kernel First” Error in GRUB

I have the Mac version of Ubuntu loaded onto a USB, booted using ReFINd with an EFI partition. All runs until I select the Ubuntu EFI Boot in reFINd. Once loading begins, I get a "Loop not found", ...
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24 views

can not build kernel 12.04 omap4

there is no way to build custom kernel for 12.04-omap4 pandaboard. I already tried all examples in internet available. Actually it worked until kernel version linux-ti-omap4-3.2.0-1455. The newly once ...
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25 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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34 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 ...