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

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How to fix modprobe?

I followed some instructions, like a typical noob, in trying to assign a tty/USB0 to my la crosse technology USB device. Instead, I guess I was installing a modprobe for an "ipaq" (I thought it was a ...
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21 views

Error using usb flashdrive - what usb error codes mean?

I have somewhat arbitrary errors when using a pendrive, as reported by dmesg: [ 306.904222] usb 2-3: new high-speed USB device number 7 using ehci-pci [ 321.080172] usb 2-3: string descriptor 0 ...
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42 views

How to detect & configure a upnp USB to serial adaptor for RXTX development in Java

I ordered a TRENDnet TU-S9 and and plugged it into my system. I heard this is plug and play and that it works on Ubuntu. I'm wondering how to determine which port identifier this USB to serial adapter ...
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92 views

PCIe error in dmesg log

I checked the dmesg logs today, and I found this: [108957.958768] pcieport 0000:00:03.0: AER: Multiple Corrected error received: id=0018 [108957.958797] pcieport 0000:00:03.0: PCIe Bus Error: ...
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214 views

What to do with `usb 3-1: Device not responding to set address`?

I found it in dmesg of my Ubuntu 14.4.02 notebook. I wonder if should take actions. ~ > grep "usb 3" dmesg [ 2.475970] usb 3-1: new low-speed USB device number 2 using xhci_hcd [ 2.476450] ...
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23 views

How to explain these edges in dmesg. What line record slow process?

Can you explain what causes these edges? Was 5.6 to 15.9 delay caused by usb 1-1.4: SerialNumber: 0x0001 or IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready [ 5.601659] usb 1-1.4: Product: ...
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1answer
57 views

How do I use dmesg to diagnose slow boot speed?

I've installed Ubuntu 15.04 on a new Lenovo Thinkpad S440. With 8 gig of RAM, an i7 and an SSD I expected Ubuntu to boot in a few seconds, instead it seems to be taking almost a minute. I've read a ...
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391 views

Ubuntu taking long to shutdown

I use Ubuntu 15.04, I have a SSD drive also. Very recently onwards the ubuntu is taking long to shut down nearly 1:30 minutes. I checked the shutdown log messages and I get the follow message. A ...
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1answer
488 views

What does perf interupt mean?

I am working on my computer, trying to write some device code. I checked into dmesg to get some info, and saw this: perf interrupt took too long (2507 > 2500), lowering ...
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1answer
121 views

dmesg full of problems after startup

This morning, my Ubuntu 14.04 installation booted to terminal rather than Gnome shell. startx got me in, but without sound (hardware not shown), and on a reboot instead tried sudo start gdm which got ...
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1answer
644 views

Error message on booting up Ubuntu 14.04.2 [duplicate]

After upgrading from kernel linux-image-3.13.0-49-generic to linux- image-3.13.0-51-generic, I am getting this error message in dmesg on startup: [ 6.352555] mei_me 0000:00:16.0: irq 47 for MSI/MSI-X ...
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209 views

Help me. my boot time is more than 20s

i have a hp pavilion laptop with 2gb ram, intel i3 and 500gb hdd boot time is taking too long(>20s). tried preload, e4rat, e4defrag etc but still no improvement below is my dmesg output ...
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151 views

Problem about detecting and mounting devices

The device I want to mount is Nokia 130. lsusb or lsblk cannot find it, but dmesg will, some part of the output is following: [30415.272150] usb 3-2: new full-speed USB device number 4 using xhci_hcd ...
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250 views

dmesg error log shows interesting warnings

Im having some weird issues with my mouse where i drag the mouse across the screen and it sticks for half a second then keeps going. I used dmesg and i found some warnings and stuff was wondering if ...
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58 views

ubuntu 14.04 take a lot of time to start

Ubuntu 14.04 takes a lot of time to boot. This is dmesg log: http://paste.ubuntu.com/10368370/ What's the problem with that?
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1answer
64 views

On startup, where does the output to dmesg get logged?

On startup, where does the output to dmesg get logged? Doesn't say on the man page: http://manpages.ubuntu.com/manpages/trusty/man1/dmesg.1.html
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1answer
561 views

Cannot mount or recognize usb flash drive ubuntu 14.04

I am having trouble mounting my 16GB usb3.0 flash drive both on windows 7 and ubuntu 14.04. Device doesn't show on fdisk or when I run lsusb. This is what I get when I run dmesg after pluging it ...
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139 views

radeon dpm: why my power state 0 has high values which are not aligned with dmesg?

# cat /sys/kernel/debug/dri/64/radeon_pm_info uvd vclk: 0 dclk: 0 power level 0 sclk: 37500 mclk: 150000 vddc: 950 vddci: 875 pcie gen: 3 # cat /sys/class/drm/card0/device/power_dpm_state ...
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1answer
29 views

Why am I getting “trusty” in a path while running ubuntu 12.04?

I'm running ubuntu 12.04 and on a different partition there is a ubuntu 14.04 distribution. When running dmesg one entry is the following: [ 3161.519138] WARNING: CPU: 1 PID: 4782 at ...
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1answer
277 views

What is taking up 320 seconds on my bootup?

Hi I've run a dmesg after booting with a kernel with loglevel=7. [ 19.439254] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff88080e62f248 [ 19.439255] xhci_hcd ...
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68 views

Confusing mount for cd-rom

I'm confused as to what is happening here. If I use wodim: wodim --devices I get this result: wodim: Overview of accessible drives (1 found) : 0 dev='/dev/sg0' rwrw-- : 'hp' 'CDDVDW ...
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1answer
309 views

My USB Keyboard isn't working

I have just installed Ubuntu and now my USB keyboard and mouse are not working. I plugged in a PS/2 keyboard so i can now execute commands. I get a lot of strange messages in dmesg: ...
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87 views

ERROR on HDD/RAID

Any one can tell me what this mean... (obtained using dmesg -T) [vie oct 24 20:06:01 2014] ata3.00: irq_stat 0x40000001 [vie oct 24 20:06:01 2014] ata3.00: failed command: WRITE DMA EXT [vie oct 24 ...
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872 views

Chromium dmesg Errors Ubuntu 14.10

How do i fix the issue Chromium dmesg Errors Ubuntu 14.10 [ 443.235756] chromium-browse[3860]: segfault at 1f8 ip 00007f89021c063f sp 00007fffedad9d80 error 4 in ...
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1answer
245 views

Long, slow boot time for Ubuntu

I'm running Ubuntu 14.04, boot takes a long time. Attached is bootchart and dmesg log http://postimg.org/image/6nepau6fh/ dmesg text went over the character limit so I'm pasting a few time leaps: ...
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819 views

14.04 BIOS, ACPI Errors in dmesg

I recently upgrade from 12.04 x64 to 14.04.1 x64 Dell Latitude Laptop I am seeing messages in dmesg that are causing me concern. The 2 excerpts below are the ones I am most concerned with: [ ...
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13k views

cp fails to copy with errors “cp: error reading 'file': Input/output error” and "cp: failed to extend 'file': Input/output error

I'm a user of Oracle Virtualbox on Ubuntu. And I used to copy vdi files as a kind of backup. Previously I did this (copying vdi file and then copying it back) many times without any problem. But ...
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101 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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5k 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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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
1k 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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2answers
2k 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
792 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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1answer
955 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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4answers
773 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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1answer
310 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
205 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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1answer
2k 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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344 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
331 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
7k 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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1k 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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1k 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
407 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
4k 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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1answer
883 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
5k 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
2k 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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33k 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
22k 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 ...