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

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18
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6answers
50k 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) [39441....
39
votes
4answers
40k 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 apt-...
12
votes
6answers
24k 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 6:0:0:...
1
vote
1answer
2k 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 ...
5
votes
1answer
2k 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 ...
3
votes
3answers
107 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
321 views

16.04: Slow boot no matter what I remove or do (Files for analysis provided)

I'm very frustrated with now long it takes my laptop to boot since I installed Ubuntu. Prior to Ubuntu, I had Kubuntu 15.04 which booted from Grub to desktop in less than 20 seconds. I switched to ...
4
votes
4answers
1k 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 ...
2
votes
0answers
271 views

Strange errors in 'dmesg' output related to mounted partition

There are some strange errors showing up in my dmesg output related to mounting sda4 on boot, which is an extended partition containing used logical volumes. The following is an extract of my dmesg ...
2
votes
1answer
171 views

Fail message during boot. Can I delay boot or how do I solve it?

I have a red boot message with error during boot, but I cant figure out what is it. I can see it says FAIL and thats all, It boots too fast ;) I have tried to look in syslog and dmesg | grep fail/...
2
votes
1answer
482 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 0000:...
2
votes
1answer
6k 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. ...
2
votes
0answers
491 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 ...