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0
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0answers
15 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
0answers
37 views

I want something to be printed at the start and end of dmesgs [closed]

echo " END COLLECTING DMESG_">/dev/kmsg is the command I used before running an IO and after running an IO. Once after clearing dmesg, sometimes I was unable to print the statement.
3
votes
1answer
26 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
34 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 ...
0
votes
0answers
32 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 |...
54
votes
7answers
37k views

How can I see dmesg output as it changes?

I'm writing a device driver that prints error message into ring buffer dmesg output. I want to see the output of dmesg as it changes. How can I do this?
16
votes
4answers
8k views

How can I write to dmesg from command line?

I'd like to write a statement to dmesg. [How] can I do this?
0
votes
0answers
32 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....
1
vote
0answers
50 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
votes
1answer
17 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 ...
0
votes
0answers
30 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
votes
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
47 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
45 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
81 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 ...
0
votes
2answers
50 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? [...
0
votes
0answers
42 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....
4
votes
2answers
2k 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 ...
2
votes
1answer
62 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
2answers
98 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
votes
0answers
15 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 ...
3
votes
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 ...
4
votes
1answer
154 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, ...
10
votes
3answers
17k views

How can dmesg content be logged into a file?

I'm running a Linux OS that was built from scratch. I'd like to save the kernel message buffer (dmesg) to a file that will remain persistent between reboots. I've tried running syslogd but it just ...
1
vote
0answers
135 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 ...
5
votes
1answer
132 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
262 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 ...
8
votes
3answers
422 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 ...
1
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
107 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 [ ...
9
votes
1answer
2k views

Where does the kernel ring buffer sit relative to rsyslog?

Is rsyslog just an abstraction layer on top of the kernel ring buffer? Or is the kernel ring buffer its own entity and rsyslogs interaction is like that of any other "application"?
0
votes
1answer
89 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 ...
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
3answers
2k views

dmesg filled with audits every minute from cron

My dmesg is filled with output of like the following, starting from a couple of seconds after booth and continuing indefinitely: [ 3155.216230] type=1006 audit(1393236841.859:85): pid=4206 uid=0 old ...
3
votes
1answer
52 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 ...
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 ... ...
0
votes
1answer
275 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 ...
1
vote
0answers
640 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: ...
0
votes
1answer
2k 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] ...
3
votes
0answers
378 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 ...
1
vote
1answer
380 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 ...
3
votes
1answer
504 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 ...
0
votes
1answer
720 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 ...
1
vote
1answer
190 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....
8
votes
2answers
56k 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 ...
2
votes
1answer
280 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
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
275 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
406 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 ...