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

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22 views

“could not add sta to kernel driver” hostapd - not able to connect more then 10 clients

I am using an nuc with wifi card "intel 3165" with ubuntu 14.04 amd64 server edition and kernel version 4.2.0.27 . I have isc-dhcp-server, dnsmasq, hostapd installed and configured on the system . I ...
3
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0answers
62 views

Xenial with 4.4 kernel still requiring reboots

I'm seeing a 16.04 system with a 4.4 kernel requiring reboots upon upgrading the kernel. I had thought that with the 4.x kernel no more reboots would be required due to the hot patching support that ...
1
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0answers
148 views

Ubuntu 16.04 lts freezes, even after upgrading kernel

I installed Ubnuntu 16.04 LTS on my machine last week. Few days after, it started freezing randomly. I upgraded the kernel version to 4.5.0-040500-generic after some search results suggested an ...
0
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1answer
131 views

Kernel 4.5.3 WIFI issues?

Specs: Dell XPS 15 9550, Ubuntu 16.04 Kernel 4.5.2 worked great for me. After upgrading to kernel 4.5.3, my WIFI is spotty at best. It was instantly noticeable. Many times, it's like my network ...
0
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1answer
92 views

How to sign kernel modules with sign-file?

I just installed Ubuntu 16.04 with secure boot and encountered the same vmware-error as described there: modprobe: ERROR: could not insert 'vmnet': Required key not available. One way to circumvent ...
1
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0answers
33 views

I was installing ubuntu and this happened

I'm installing ubuntu into an old computer. Everything was going great, I was in the installination phase, I got to the part where it asked me for what I would like to name this computer and then ...
0
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2answers
184 views

Kubuntu 16.04 and NVidia drivers

This question was already asked a few times already. The threads where it was asked were closed due to low quality answers. I can confirm that none of the answers worked for me - I upgraded the ...
0
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1answer
81 views

Do I need to upgrade to Kernel 4.2 on Ubuntu 14.04.4 LTS?

I am using Ubuntu 14.04.4 LTS on my Dell Inspiron 5548 with i5 and ATI Graphics AMD Radeon R7 M265 2GB DDR3. (First I installed Ubuntu 14.04.2 LTS then got automatically upgraded to 14.04.4 LTS but ...
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0answers
15 views

Touchpad debugging - Opinion needed

I'm trying to debug an odd touchpad problem with Ubuntu 14.04.4 on a Lenovo e460. I have followed this touchpad debugging tutorial, but it doesn't directly address the symptoms I am experiencing. ...
0
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0answers
26 views

Install perf at 4.5.2 kernel

Does perf affect battery life? At 4.5.2 kernel stable in 16.04 LTS the TLP output states: /sys/devices/system/cpu/intel_pstate/min_perf_pct = 18 ...
2
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0answers
82 views

Kernel Panic - not syncing - Attempted to kill init ! exit code 0x00007f00

I am using Ubuntu 14.04 LTS dual boot with windows 8. Yesterday I was installing hadoop on my system and suddenly Ubuntu stopped working. So I have to power it off directly by pressing and holding ...
0
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1answer
25 views

What is the use of Kernel updation?

Now I am using Ubuntu 14.04 LTE.What is the advantage over previous version if I updated to new Kernel update?
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0answers
20 views

slow startup boot cause by the usb 1-1.4

For some reason the boot time is very slow I run the dmesg command in order to see what i tacking so much time. [ 8.191775] USB Video Class driver (1.1.1) [ 8.230700] usb 1-1.4: USB ...
4
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2answers
1k views

Kernel update gets stuck (Ubuntu 16.04, Kernel 4.4.0-22)

The software updater displayed a message that new update are available. I chose install update. Apparently, the updates were supposed to install Kernel version 4.4.0-22. But, the installation process ...
0
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0answers
57 views

the wifi driver is not working in Ubuntu 16.1

my droadcom chipset is BCM43142 802.11 b/g/n. I checked with the software and updates tab in the system settings and it shows that I am using a driver sourced from bcmwl kernel source.But it is still ...
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0answers
20 views

Problem on squid

My authentication on squid stops, after this message on syslog: May 6 10:44:49 kernel: ntlm_auth[27754]: segfault at 8 ip 00007f3a88b5b9b0 sp 00007ffe588751c8 error 4 in ...
0
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0answers
19 views

About Kernel 3.14.4

For my problem is when I install the Kernel 3.14.4 that always jump alot of this line to me : libkmod: ERROR ../libkmod/libkmod-config.c:686 kmod_co'fig_parse: /etc/modprobe.libkmod: ERROR ...
2
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0answers
37 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 ...
-1
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0answers
15 views

Kernel compile sotware

How to install this: Current Minimal Requirements Upgrade to at least these software revisions before thinking you've encountered a bug! If you're unsure what version you're currently running, the ...
0
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0answers
18 views

Remove latest kernel

Ubuntu 14.04 comes with kernel 4.2.0-27 or newer but my laptop supports only up-to 3.13.0-85 so after installing kernel 3.13.0-85 I want to remove 4.2.0-27 but when I try it is asking to install newer ...
0
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1answer
51 views

Choosing a motherboard for a ubuntu build [closed]

I'm planning my first computer build. Because I love programming I decided to go with linux for a unix like operating system. I've spent hours reading about components. My first plans for a system ...
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0answers
59 views

Skip sign verification at module loading

With secure boot enabled, is there a way to load a custom kernel module not signed, or signed with an auto-generated private key? Trying to load my custom module, insmod exits with the error Required ...
0
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0answers
35 views

“[Firmware Bug]: ioapic 2 has no mapping iomm” after kernel update

I'm on a macbook pro and I installed ubuntu alongside osx, it works really well except the handling of lid closure, so I upgraded the kernel to 4.4.8 in order to see if it can fix the problem. In ...
0
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0answers
27 views

Kernel not found when booting a 16.04 USB on HP Pavilion g6 [duplicate]

I created a live USB from the Ubuntu 16 AMD64 iso using Startup Disk Creator. But every time I try to boot from the USB, it shows the error vesamenu.c32: not a COM32R image. I have an HP ...
0
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0answers
10 views

Import FreeBSD Kernel Module into Ubuntu

A bug in the linux kernel's USB module is stopping me from using a barcode reader with Ubuntu - USB Keyboard Barcode Reader Dropping Chars . This bug isn't present in FreeBSD. Can I use the USB ...
2
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0answers
167 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 ...
0
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0answers
32 views

How to ping an address port?

I'm working with this code that drop packets in a specific port : #include <linux/module.h> #include <linux/string.h> #include <linux/kernel.h> #include <linux/ip.h> /* ...
0
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3answers
190 views

Ubuntu 16 Kernel BUG (“Oops: 0000 [#1] SMP”) related to amdgpu

I recently installed Ubuntu 16.04 on my personal notebook (Dell Inspiron 5548) and everytime I try to logout from any user account, I get a Kernel BUG ("Oops" message) related to amdgpu. I tried ...
0
votes
1answer
15 views

Oops andTainted G for DVB adaptor load

Can anyone advise on Oops and Tainted fail please? Running the 3.16.0-4-amd64 kernel and loaded media_build from v4L and supporting applications. But both of 1. Hauppage WinTV Nova TD500 and 2. PCTV ...
1
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1answer
59 views

Bluetooth not working on Ubuntu 14.04 with Wily kernel (4.2)

I have a Dell Precision M4800 using Ubuntu 14.04.4 with Wily kernel (4.2.0-35). Bluetooth is not working for me. Tried the steps in this question, as my setup seems to be exactly the same as the one ...
0
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1answer
113 views

Looking for ppa kernel for ubuntu 16.04

http://kernel.ubuntu.com/~kernel-ppa/mainline/ dose not have any ppa kernels for 16.04. I have stability with current kernel/nvidia. I have frequent system freeze (when switching between VT). The ...
3
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0answers
36 views

USB Keyboard Barcode Reader Dropping 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 ...
0
votes
1answer
144 views

ubuntu 16.04 auto load usb dvb-t dongle module

The kernel module of a dvbt usb dongle is not loaded automatically when plugged in. dmesg prints on plugin of the dongle: [25205.557608] usb 1-5: new high-speed USB device number 9 using ehci-pci ...
3
votes
1answer
30 views

Servers Hardware Certification of kernel upgrades

I am trying to figure out the HW certification policy for older HW (my interest is servers). When a new point-release or HWE is available, it usually includes a Linux kernel update. Is there a ...
0
votes
1answer
15 views

scheduler: how to tune cfq to favor interactive processes

Problem: scheduler doesn't seem to favor interactive processes: On a desktop system with automatic cron-scheduled backups from one (btrfs) disk to another (ext4). The backup process mounts the idle ...
1
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0answers
172 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 ...
1
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0answers
49 views

Systemd Kernel Variables Error

At boot, I receive an error message [failed] failed to start apply Kernel variables. I have not used a Systemd distro until now so I'm not sure what I should be looking for. I ran this in terminal ...
0
votes
0answers
11 views

Edit “Kernal Boot Parameter” from windows to install Linux

Trying to install Linux on a new think pad and getting the error: Intel_pstate: HWP enabled Then it stops loading. It seems I need to edit the boot parameter but all instructions I can find are ...
1
vote
1answer
81 views

How to rebuild kernel for wacom tablet driver?

I have installed Ubuntu 16.04 and my Wacom CTL-471 completely crashes the system every time I get near the surface with the pen. Every time I have to reboot, nothing helps. So I found out that these ...
0
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0answers
97 views

Kubuntu 16.04: Suspend works only once after reboot

After upgrading to Kubuntu 16.04 (with default 4.4 kernel), suspending works only once after reboot. Second attempt fails, the screen goes blank, but the power remains on. After a forced reboot, I can ...
0
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0answers
22 views

How to Restore Ubuntu 14.04 kernel and Replace `bcmwl-kernel-source`?

I followed unsuccessfully an advice in the thread Will 16.04 Support Wlan driver of Mac air? and run sudo apt-get update sudo apt-get install bcmwl-kernel-source sudo apt-get autoremove How can ...
1
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1answer
22 views

Source code of usbmon

Where can I get the source code of usbmon utility. Googling didn't help me to get the source code. Any help is appreciated.
0
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0answers
16 views

Ubuntu 14.04 LTS & Ubuntu 15.10 - ALERT! /dev/disk/by-uuid/… dropping into shell

I got this error after some days running ubuntu alongside windows 10. I am working on an acer laptop. I tried every expected solutions in other similar questions here, but none worked for me. So I ...
0
votes
0answers
52 views

zswap: default zpool zbud not available, pool creation failed

My system seems to be working fine, but in the interest of learning, I'm investigating the red bits of my dmesg. Here's one: zswap: default zpool zbud not available zswap: pool creation failed what ...
0
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1answer
41 views

Difference between linux kernel and Ubuntu mainline kernel [duplicate]

As this wiki Ubuntu page says: By definition the mainline kernel builds are made from virgin unaltered mainline kernel sources and therefore do not, and should not, include any Ubuntu patches ...
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0answers
12 views

Access to hard-drive when machine won't boot

Recently I tried to downgrade my kernel (from 3.13 to 2.6.24), and I made sure that the 2.6.24 kernel compiled and installed without any errors. I also updated the grub file to boot with the newly ...
0
votes
1answer
20 views

how to use a kernel patch?

I have a problem with my sound card and there is a patch on git that seem to repair my problem. here the patch But I don't know how to use patch. Someone can help me? edit :I saw that how to build ...
0
votes
1answer
118 views

How to remove new kernel and make older default (16.04)

I upgraded my kernel to version 4.4.8 in an attempt to enable suspend/hybernate, but in turn it decreased the battery life. So i want to either a. delete je 4.4.8 and revert to 4.4.0 kernel in my ...
0
votes
2answers
82 views

How to set previous kernel as default in GRUB (Grub customizer)

Can you guys please help me use Grub Customizer to set an older version of the kernel 4.4.0 of Ubuntu 16.04 LTS as default when booting? I'm not using a dual boot system, and I have installed 4.4.8 ...
0
votes
1answer
179 views

Upgrading to 4.6.0-rc6 kernel fixed my flickering screen issue but now WiFi doesn't work (Dell XPS 13)

I have a 2016 Dell XPS 13 (FullHD display, i5 version). It has a Broadcom wifi module (BCM4350) which you might know has pretty terrible Linux support. However, it is supported by the Linux kernel ...