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17 views

dmesg - force using syslog, sysctl

I know how to tell dmesg to write messages to syslog, but I cannot find the property I want so that I don't have to issue a command and just have it be a "configuration" automatically applied via ...
3
votes
1answer
32 views

Bluetooth BNEP takes a long time to load on boot Debian

My system takes a long time to boot and looking at dmesg output I found an entry with BNEP (Ethernet Emulation) ver 1.3 that takes around 27 seconds to load. Does anyone have a clue on how to speed ...
2
votes
1answer
36 views

Tweak perl script for human-readable dmesg output

In RHEL 6 I have the kernel parameter: printk.time=1 So that my dmesg would have a timestamp. However it shows in seconds from restart, like this: [12.23456] I found a script that you place ...
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0answers
40 views

Can't mount fdescfs to /dev/fd

Hello I can't mount fdesc,here is the output root@nshost2:~ # mount -t fdescfs fdesc /dev/fd mount: fdesc: Operation not supported by device And here is the output of dmesg root@nshost2:~ # dmesg |...
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0answers
35 views

dmesg filling up with error message that are just a hex number

I've got a Cubietruck running debian 8.4, and it seems to be running OK, but just happened to do a dmesg, and found that I was getting a lot of message consisting of just a hex number... [ 3353....
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0answers
77 views

Can't get usb ethernet adapter running under CentOS 6 minimal

I have a cheap usb adapter and using it on a minmal CentOS 6.7 box, when I plug in the adapter it's recognized as usb device but not as ethernet adapter, although I've loaded these kernel modules: ...
0
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1answer
19 views

dmesg -n7 has no effect in virtual terminal

When I type dmesg -n7 in console (ie when I switch to tty1 using Ctrl+Alt+F1) I can see all debugging messages (new disks plugged in, etc). When I type dmesg -n7 in virtual terminal (terminal ...
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0answers
37 views

AE_NOT_FOUND Evaluating _DOD

I have arch linux installed on my Dell inspiron 3543, fwts told me about a message in my kernal log about an acpi ae_not_found exception while evaluating _DOD. It seems that this is related to my ...
0
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1answer
30 views

is there a description for kernel messages?

I use dmesg to output kernel messages, but since I'm new to linux I have no idea what this informations mean. Is there a good tutorial or description so I can understand the messages. for example: ...
3
votes
2answers
62 views

How can I activate extra-verbose mode (debugging mode) during Debian boot?

How do I activate extra verbosity during boot, on Debian? I removed the quiet parameter and tried to add debug but it didn't help. My problem is that my keyboard takes 2-3 min to activate so it ...
1
vote
2answers
49 views

Making sense of Time in dmesg

I know the time in dmesg is the time since boot. But my specific question is this time is calculated at the start or end of the process mentioned in the line? Why this is important? take this example:...
1
vote
1answer
101 views

Wifi stopped working, “Unknown symbol wireless_nlevent_flush”

As of this afternoon the wifi on my Dell XPS 13 stopped working (running Debian sid with kernel 4.4.0-1-amd64). lspci detects my wifi card, but ifconfig -a shows only the loopback interface. I tried ...
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0answers
48 views

Unable to connect to wifi “IPv6: ADDRCONF(NETDEV_UP”

When I click on the wifi icon and the hotspot I want to connect to, nothing happens. Nothing at all. And here's my dmesg: [ 9647.582070] IPv6: ADDRCONF(NETDEV_UP): wlp4s0: link is not ready [ 9957....
0
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2answers
59 views

CPU: 13 PID: 15452 Comm: ssd_blk/0 Tainted: G B I E 3.19.0+ #1

I developed a module which works as an emulator for a block device. When I write into the block device, I get this in dmesg and the module crashes. I cannot get any hint about what is going on? [...
1
vote
2answers
136 views

How to print kernel time from command line?

How can I convert the uptime output to seconds since epoch to compare with dmesg output? Does uptime have the same resolution as the kernel message time? Is there a way to more directly get the ...
0
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0answers
18 views

How to find out what process wrote a particular log in dmesg?

I have bought an android tv box which has an hdmi capture card inside. From time to time the capture card stops to record. I need to restart the device for it to work again. I am trying to find a way ...
4
votes
1answer
167 views

How to exclude auditd messages from dmesg and only log them in /var/log/audit.log

I use audit to log suspicious user actions on a workstation in my institution. I found that, in addition to logging to /var/log/audit.log, auditd also writes to /var/log/messages. Consequently, ...
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0answers
149 views

My “SG303” barcode scanner works on Windows. But it doesn't work on Linux; why not?

I have the following issue with a Barcode Scanner (working fine on PC with Win8.1). I don't know much about the scanner, it's called "SG303 High Performance CCD Scanner" and I don't know if this one ...
0
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1answer
282 views

Is there a way to temporarily disable segfault messages in dmesg?

Linux kernel keeps logging segfaults in ring buffer. a.out[25415]: segfault at 8049604 ip 08049604 sp bf88e3fc error 15 in a.out[8049000+1000] Is there a way to temporarily disable it? My usecase ...
2
votes
1answer
67 views

What is the appropriate pronunciation of the “dmesg” filename? [closed]

How should the file dmesg (as in /var/log/dmesg) be pronounced? I've always pronounced it as "dee message" but received an odd reaction from a Unix admin when I did that.
1
vote
1answer
123 views

Big gap in dmesg and slow boot

Here is the snippet from my dmesg log. There is a big gap from 14s to 513s! I don't have a clue how to troubleshoot this delay. [ 10.862848] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready [ ...
0
votes
1answer
95 views

Network interface name: “/var/log/dmesg” vs “/etc/udev/rules.d/70-persistent-net.rules”

Is it more reliable to look up the association between interface name and MAC address in /var/log/dmesg or in /etc/udev/rules.d/70-persistent-net.rules? On Debian 7 or CentOS 7, out of the box, I can ...
8
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3answers
462 views

decrease kernel boot log verbosity level

When my kernel boots, apart from the useful important information, it prints lots of debugging info, such as .... kernel: [0.00000] BIOS-e820: [mem 0x0000000000000000-0x000000000009d3ff] usable ...
3
votes
1answer
54 views

change log format for dmesg

I am getting my dmesg messages like this, [ 27.154743] uvcvideo: Found UVC 1.00 device Integrated_Webcam_HD (0c45:6a04) [ 27.194956] usbcore: registered new interface driver uvcvideo But, I ...
5
votes
1answer
136 views

USB drive offline in dmesg and ? in ls, but only for some files?

I have a backup drive that has been intermittently failing (but almost always succeeding) to run rsnapshot lately. ls and e2label output are not encouraging: $ ls -al /mnt/backup/ ls: cannot access /...
0
votes
1answer
293 views

WiFi frequently drops, suspected driver issue

I'm running a fully up-to-date Fedora on a Macbook Pro. To get WiFi working in the first place, I installed akmods-wl as recommended. The WiFi works, but the connection keeps dropping. I've noticed ...
0
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1answer
3k views

enp3s0: link is not ready

I've some strange messages in the dmesg output: [ 7.588762] IPv6: ADDRCONF(NETDEV_UP): enp3s0: link is not ready [ 7.589616] IPv6: ADDRCONF(NETDEV_UP): enp3s0: link is not ready [ 7.591897] ...
1
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0answers
663 views

What does nouveau's “func 08 lookup failed, -2” mean?

Arch Linux Question I have an Nvidia 9500 GT Chipset: G96 (NV96) Family : NV50 This means I can use proprietary pack nvidia-340xx + nvidia-340xx-libgl, but I opted for the open source option: ...
3
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0answers
407 views

How to debug ACPI/poweroff problems?

I recently replaced my hard drive with a Sandisk SSD and did a fresh install of Fedora 21 (previously using F20). Now my laptop won't power off, and I'm not sure which of the two is causing the ...
2
votes
1answer
407 views

Where in the kernel /dev/kmsg gets initialized?

I'm trying to figure out at which point in the boot up process /dev/kmsg gets initialized and can thus be written. On my system the first line that occurs in dmesg is printk(KERN_INFO "Initializing ...
0
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1answer
780 views

How to read *.journal files in Fedora 21?

I want to see the previous dmesg log before the reboot. In previous versions of fedora, It used to be in /var/log/messages. But from Fedora 20, it's being stored through systemd i.e. journalctl. I've ...
3
votes
1answer
293 views

Slow root / mounting time

By running dmesg -t -d on my Raspbian/Debian Jessie, I see that this is a bottleneck in my booting process: [< 4.777880>] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. ...
1
vote
1answer
196 views

Force mounting, bypassing fsck

When I try to mount some SD card, it fails and dmesg displays: [ 124.121735] FAT-fs (sdb1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck....
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2answers
68 views

About how many lines come up when booting a typical Linux distro?

I'm trying to understand all the text that screams by when my server boots up. Is that really intended to be human readable? About how many lines scream by? Is there a way I can count them? Is ...
1
vote
1answer
296 views

How to setup boot scripts to save orphan inodes after improper shutdown?

after abnormal shutdown in dmesg I have [ 16.107445] EXT4-fs (dm-1): INFO: recovery required on readonly filesystem [ 16.107450] EXT4-fs (dm-1): write access will be enabled during recovery [ ...
7
votes
1answer
1k views

Difference between output of dmesg and content of /var/log/dmesg?

I found the output of dmesg and content of /var/log/dmesg are different. Then what differences are between their purposes?
0
votes
1answer
425 views

HDD Won't connect / system won't read it. Not sure what dmesg output means`

I have a hdd that I pulled from an old windows laptop, I don't think there's any information on it that I want to keep. I was going to format it to ext4 or something. Yesterday when I connected and ...
1
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0answers
20 views

Can I capture reboot errors on a system that lives in memory?

I have a machine that will intermittently experience boot issues and the system will hang and won't come up. I would normally go to check dmesg, but the problem is the system lives in memory and gets ...
1
vote
3answers
2k views

Log message “Disabling IRQ”: what does it mean?

This message appears in my dropdown terminal at seemingly random times when no processes is running in that terminal: andreas@debianator:~$ Message from syslogd@debianator at Feb 24 18:57:58 ... ...
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2answers
3k views

dmesg: pci BAR 7: can't assign io

I have VMware virtual machine running Debian Wheezy. I have compiled my own kernel 3.14. I have noticed dmesg is flooded with messages pci BAR 7: can't assign io (size 0x1000). I have no idea what ...
5
votes
2answers
5k views

How to read dmesg from previous session? (dmesg.0)

dmesg is a command to read the contents from /var/log/dmesg. The nice thing compared to less /var/log/dmesg is that I can use the -T flag for human readable time output. Now I would like to look at /...
2
votes
1answer
1k views

What is MCH_SSKPD warning in dmesg?

While i was reading dmesg log just to check that everything is fine, i met [ 18.956187] [drm] Wrong MCH_SSKPD value: 0x16040307 [ 18.956190] [drm] This can cause pipe underruns and display ...
3
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2answers
2k views

Mount an USB: dmesg shows nothing

I'm trying to mount a USB-drive. However, it seems that my Linux (Debian) doesn't recognise it at all (and any other usb-drive), though it powers it. The usb-hubs are OK, because I was able to boot ...
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vote
1answer
1k views

No ttyUSB when connecting USB-RS485 to Beaglebone Black

I'm trying to connect a externally powered board to control the motors of a robot to my BeagleBone Black. I'm using ssh over USB(the mini-usb) to control the Beaglebone from my laptop. The BBB is ...
1
vote
1answer
91 views

module prints to kernel log with delay

I've created a basic linux kernel module, which does the following: static __init int init(void) { printk(KERN_DEBUG "Banana"); return 0; } And of course: module_init(init); Strangely, I ...
2
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1answer
145 views

ifup wlan0 causes kernel Oops

on my laptop, when I do ifup wlan0, sometimes I get following call trace in dmesg. Other times, the log looks perfectly normal, and there are no kernel Oops messages. In both cases (with errors and ...
3
votes
1answer
512 views

can't filter printk messages

I'm writing a driver and usually I implement my own log-level scheme. However, this time I figured that I would try to utilize the printk scheme that is built into Linux. I see that I can adjust the ...
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0answers
56 views

How can I find out if a problem with the USB ports in my laptop is due to hardware or software?

A few days ago, the USB ports in my laptop stop working. At first, I thought it might be due to a recent update of my OS (Ubuntu 14.04), so I began testing if something came up when connecting a ...
4
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1answer
5k views

How to know what to grep for in dmesg?

I recently had some trouble with a wireless card, and an online forum suggested searching dmesg with grep firmware. That helped, I was able to find the problem immediately! However, the previous hour ...
8
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2answers
61k views

command to determine ports of a device (like /dev/ttyUSB0)

I have a question regarding the ports in Linux. If I connect my device via USB and want to check its port I cant do it using the command lsusb, which only specifies bus number and device number on ...