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

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11
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6answers
19k 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 ...
2
votes
0answers
369 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 ...
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. ...
1
vote
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 ...
10
votes
5answers
21k 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) ...
12
votes
2answers
9k 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 ...
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 ...
5
votes
3answers
7k 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 ...
3
votes
2answers
459 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 ...
1
vote
0answers
579 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? ...
0
votes
0answers
79 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 ...