dmesg (for "display message" or "driver message" ) print or control the kernel ring buffer

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Ubuntu behaving very slowly: 2 hr boot time (ata1 hard resetting link / device reported invalid CHS sector 0)

I have a fresh install of ubuntu 14.04 as a dual boot with windows 8.1 on my HP Pavillion laptop. The windows 8 partition works fine (i.e. boots quickly, performs well etc). The Ubuntu partition is a ...
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13 views

My Gateway's BCM57765/57785 SD card reader isn't working

The device will not show up with "sudo fdisk -l". This is not just a corrupt card, it's been reoccurring for every card I try. This is the output from the dmesg [ 21.835685] mmcblk0: unable to ...
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1answer
55 views

How to discover what file in the dev/ directory is related to the SD card reader of my laptop?

how can I discover what file inside dev/ directory is related to my SD card reader of my laptop? I thought that I could execute the following operations: 1) Remove the SD card from the reader 2) ...
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41 views

Why I can't acces to an SD card with the laptop SD card reader?

I have ab Ubuntu 12.04 installation on a Virtual Machine and I am finding some problems try to read an SD card inserted into the SD card reader of my laptop. The problem is that if I try to insert ...
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1answer
825 views

Slow boot Ubuntu 14.04

A few months ago I changed on my Lenovo Q180 HTPC from Windows to Ubuntu (only Ubuntu installation, without dual boot). Now, after upgrading to Ubuntu 14.04 I am noticing a slowdown on boot. ...
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1answer
1k views

What is nss-myhostname? And why is it not installable?

dmesg shows the line systemd-hostnamed[3964]: Warning: nss-myhostname is not installed. Changing the local hostname might make it unresolveable. Please install nss-myhostname! But sudo ...
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1answer
198 views

Booting Paravirtualized Kernel On Bare Hardware

I been reading dmesg and i found the line " Booting paravirtualized kernel on bare hardware " but I am not using Ubuntu in visualization I am using it on my laptop DELL N5110 the only OS I have on ...
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42 views

Not able to see pr_info output

I have added some pr_info statements in some source code files like driver/usb/core/generic.c , message.c , usb.c , hub.c , driver.c. When I run make modules;make modules_install;make install I am ...
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2answers
351 views

AMD Turbo Core not working - Change CPU driver?

I Got an AMD FX(tm)-8350 Eight-Core Processor with 4GHz frequency and up to 4,2 GHz Turbo Core speed, but I cant get the Turbo Core to work. dmesg | grep powernow should tell me something like: [ ...
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1answer
122 views

Kernel module getting loaded automatically

When i do rmmod usb_storage and then dmesg i can see the output saying usb_storage deregistered. But when i attach a flash drive and then dmesg , it says Initializing USB Mass Storage driver... ...
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45 views

Long delay on boot after fb0: VESA VGA frame buffer device

I have a Ubuntu PC with 2 AMD R9 cards and I get a long delay on boot (around 2 minutes). When I check dmesg I get the following : [ 16.128179] hda-intel 0000:03:00.1: Enable sync_write for stable ...
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195 views

Long booting time

Can anyone help me fix the booting time of my machine.?it is almost 25 seconds. My dmesg is the following : .... [ 4.423259] usb 3-4: New USB device found, idVendor=0bda, idProduct=5728 [ ...
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30 views

Moving files to usb stick and virus scan

I have the task of moving a single file to 50+ usb sticks and then virus scan them with clam-AV. I have a 6 way usb hub that I can use to speed things up. I am after running a script that prompts for ...
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1answer
430 views

TVHeadEnd on Pi saying “No input detected”

This is my first time posting on here. I had a ubuntu 12.04.3LTS server running TVHeadEnd, with a RPi as the frontend. Everything was working fine, i then went and brought myself a little Dell ...
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2answers
262 views

Ubuntu 13.10 on Thinkpad slows down dramatically when power adapter is plugged in

When I plug in my power cable -- sometimes -- Ubuntu 13.10 immediately slows down in just about every way. This has been happening for months, but I only recently finally connected the dots, in part ...
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149 views

EV3 USB not enumerating - Next steps?

The following is solved. Not sure how to mark it so within askubuntu. I am trying to connect the Lego Mindstorms EV3 brick to my laptop (running Ubuntu 13.10). As per ...
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33 views

Display occasionally cuts out and shows black screen and dmesg output

Like I said in the title, my display occasionally cuts out and shows only a console-like display of the dmesg output, black background, white monospace font. I am often able to fix this by ...
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1answer
140 views

How does Ubuntu periodically scan SCSI devices?

I'm hoping someone here can help me understand how Ubuntu 12.04.3 scans the SCSI bus periodically. I've enabled SCSI logging via this command: scsi_logging_level -E 3 -S 3 -M 2 When I plug in my ...
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1answer
91 views

dmesg gives PM-Timer Bug

Command dmesg on my PC gives e.g. following: [ 0.123440] pci 0000:00:1f.0: [8086:24c0] type 0 class 0x000601 [ 0.123446] * The chipset may have PM-Timer Bug. Due to workarounds for a bug, [ ...
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794 views

Help me improve boot time?

here is a part of my dmesg output witch i think it has some issues tell me what can i do to reduce that gap [ 4.573598] scsi 2:0:0:0: CD-ROM hp CDDVDW TS-L633R 0200 PQ: 0 ANSI: ...
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124 views

USB device (ThinkPad Lenovo) recognized, but not in /dev

I am running ubuntu minimal 13.04, and want to connect my Lenovo ThinkPad to the laptop. After connecting: dmesg: [ 709.288194] usb 1-1: new high-speed USB device number 7 using ehci-pci [ ...
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632 views

Ubuntu Touch Black Screen Samsung Tab 10.1 (p4wifi) GT-P7510 [SOLVED]

I installed both the CyanogenMod image and ubuntu release preview saw the login screen applied the p4wifi.conf to get the proper resolution connected to wireless and ran # apt-get update # apt-get ...
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408 views

Can someone help me analyze the bootchart & dmesg logs for my slow booting Ubuntu computer?

My Ubuntu computer takes 1-1.5 mins to boot up. Following tips from this question, I generated the bootchart and saw the logs from dmsec but I can't figure what's wrong. Can someone please help? ...
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1answer
1k views

How to save boot log from failed boot?

I know I can run dmesg to look at boot errors. However, my system is failing to boot right now. It hangs indefinitely while trying to initialize hard drives. However, I can boot up into safe mode. ...
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2answers
241 views

How to control order of device loading during startup?

I am running Ubuntu 13.04 on a Lenovo Thinkpad E420s. I am having a problem with the timing of device loading during startup. I assume this was always happening, but I did not realize it was an issue ...
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1answer
224 views

Where can I get i915_error_state from debugfs and the full dmesg?

My system has been intermittently freezing (apart from the cursor) for a month or two. I am running Ubuntu 12.04 on a Dell XPS L502X (hybrid graphics card, so I'm running Bumblebee). Usually even ...
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1answer
2k views

How to display messages from kernel module without using dmesg?

In order to display the messages loaded into a kernel module, I can use the command dmesg Is there any alternatives for this command? How this function gets all these kernel messages?
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710 views

Why is my machine flooding the wireless with LLC protocol packets? [closed]

Shortly after upgrading to the recent kernel 3.2.0-36-generic I started to notice that my wireless connection got seriously jammed: Anything over the web (SSH, HTTP(S)) appears to be a bit slow. ...
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1answer
982 views

How can I improve my boot time? (bootchart and dmesg output included)

I've noticed that my boot time lately has been unusually slow. I am running 12.04 a laptop with a 2.40GHz CPU and 4GB of RAM. I've run bootchart and dmesg, but I'm not sure how to use them to address ...
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0answers
350 views

dmesg - how to make boot sequence faster

My system used to boot pretty fast when I first installed ubuntu almost one year ago, but now takes a lot more. I used dmesg to see if I could find anything and there seems to be a 35 second gap ...
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1answer
2k views

What does it means: `cgroup_disable=memory` in my `dmesg`?

My dmesg command give me that result in particular: [0.000000] please try 'cgroup_disable=memory' option if you don't want memory cgroups What does it meanings and how to know what I want around ...
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240 views

Laptop taking far too long to start

Ok the stats: Software Ubuntu: 12.10 Gnome-Shell: 3.6.1 Laptop Model: Sony Vaio SVE15118FGB Processor: Intel® Core™ i7-3612QM Processor 2.10 GHz with Turbo Boost up to 3.10 GHz Memory: 8GB DDR3 ...
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1answer
786 views

external hard drive not detected after ubuntu crash [restarting machine]

today i tried to watch movie [with vlc media player] from my external hard drive [expansion portable 500 GB], and it's play good, then pause the movie and play it again, and my Ubuntu crashed! ...
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2answers
3k views

What does the following dmesg output means?

I am not sure what does this following means:- [ 0.652039] ACPI: Added _OSI(Module Device) [ 0.652044] ACPI: Added _OSI(Processor Device) [ 0.652049] ACPI: Added _OSI(3.0 _SCP Extensions) [ ...
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1answer
1k views

USB external drive is not recognized by any OS, how to troubleshoot in Ubuntu?

First of all I would like to inform you that I saw a question similar to mine but the error was different, so here's my problem... I have an external HD samsung s2 model of 500GB and a day to day ...
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5answers
16k views

Are these sata errors dangerous?

I'm getting these errors ramdomly, and I don't know if its normal or not. [39441.061856] ata3.00: failed to read SCR 1 (Emask=0x40) [39441.061866] ata3.01: failed to read SCR 1 (Emask=0x40) ...
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6answers
17k views

Errors in dmesg - Test WP failed, assume Write Enabled [duplicate]

I'm experiencing some problems with drive cache and I don't know what's causing these problems. This is my dmesg: [11690.011238] sd 6:0:0:0: [sdb] Asking for cache data failed [11690.011248] sd ...
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1answer
2k views

atkbd.c spamming the logs. How to get rid? what is this?

On my Vostro 1000 notebook the following messages spam my dmesg: [18678.728936] atkbd.c: Unknown key released (translated set 2, code 0x8d on isa0060/serio0). [18678.728941] atkbd.c: Use 'setkeycodes ...
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0answers
567 views

Kernel panic on Lenovo ThinkPad W510 Ubuntu 10.10

When I leave my Lenovo ThinkPad W510 laptop unattended it locks the screen as it is supposed to do. But when I come back I usually find the kernel panic going on on the laptop: the Caps Lock light is ...
2
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1answer
427 views

Overriding DSDT did it work?

I have compiled a kernel using a custom DSDT file. I just want to make sure the kernel is using it. When I run dmesg |grep DSDT I get this: [ 0.000000] ACPI: Override [DSDT-Notebook], this is ...
4
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1answer
310 views

Sometimes ubuntu takes 2 minutes to start

Sorry for the English mistakes, I'm Spanish. I have a tablet with ubuntu 11.10 completely updated. Sometimes it takes about 35 seconds to boot, I suppose it's a right time. However, there are LOTS ...
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1answer
1k views

Disable detection of certain hardware?

I have a computer with two PCI TV cards. One is Compro (Win friendly), another is Leadtek (Linux friendly). Now, i'm trying to optimize my Ubuntu boot process and i would like to disable detection of ...
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3answers
6k views

How can I disable the purple bootloader splash at boot?

This question has been answered before, but neither of the methods in the accepted answer worked for me on 11.10. First I tried editing in /etc/default/grub, and then running sudo update-grub. But ...
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1answer
1k views

Can I identify encrypted files resulting in dmesg errors, or fsck the encrypted files?

A few days ago, I accidentally ran out of space in my encrypted (ecryptfs) home folder after upgrading to oneiric (Tracker went nuts). I noticed because I couldn't write my files with vim anymore, and ...
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0answers
483 views

What does a “psmouse.c: TouchPad at isa0060/serio1/input0 lost sync at byte 1” message mean? [closed]

This is the output of dmesg|tail [13064.329754] psmouse.c: TouchPad at isa0060/serio1/input0 - driver resynched. [13067.095373] psmouse.c: TouchPad at isa0060/serio1/input0 lost sync at byte 1 ...
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2answers
250 views

System fails to start after compiling grsec kernel

Recently I've tried to compile kernel with grsec patch to increase security of my machine. Compilation went even smoothly, but after running new kernel system runs until xserver starts. Here's ...
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1answer
815 views

Can I block log messages from specific devices or drivers?

I'm getting "NVRM: os_raise_smp_barrier()" messages in syslog and dmesg at a rate of 4-6 per minute; I think it's from the Nvidia graphics driver. The system behaves normally, but the messages ...
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1answer
1k views

Wifi range issues and intermittent dropouts, Thinkpad Edge

If I am more than a couple of metres from my access point (and I'm seeing this across various APs) with my newish Thinkpad Edge 15, running 10.10, the wifi performance becomes ... flaky. When this is ...
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2answers
1k views

What does the kernel message `CPU0 attaching NULL sched-domain.` mean?

Question: What does this dmesg mean? Is it bad? There is a two year old post about how this could imply degraded I/O performance, could this be/is this still true?? Background: I have been ...
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1answer
5k views

What does the `dmesg` error: “composite sync not supported” mean?

Question: I see [ 20.473125] composite sync not supported and several such entries when I run dmesg. What do they mean? Background: I'm trying to debug a problem where my laptop won't suspend. ...