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ShiroiKuma
n00b
Joined: 09 Nov 2012
Posts: 40
Location: Japan
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 Posted: Thu Aug 07, 2014 12:25 pm Post subject: [solved] dmesg shown in tty |
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I've got a new gentoo system installed yesterday and booting a systemd system via grub2 (efi). No problems major problems so far but one confusing one... once my login prompt appears in tty0, the output of dmesg is still popping up. For example instead of I'm seeing | Code: | | nf_conntrack: automatic helper assignment is deprecated and it will be removed soon |
and then a bit later one regarding kworker, right over where my command line prompt is/was.
I've never seen this on a system before. Have I missed a fundamental step?
I've tried searching but perhaps using the wrong terminology. I've been trying to find why dmesg is outputting to framebuffer, but nothing helpful so far.
Any ideas?
Edit:
Maybe this from the systemd page... console/tty/framebuffer are all the same thing?
| Quote: | | When not using quiet option, you could get some messages overwriting consoles, that is caused by kernel configuration (see man 5 proc and look for /proc/sys/kernel/printk). To tweak it you can pass the loglevel=5 boot parameter to the kernel (or a lower value like 1). |
Last edited by ShiroiKuma on Thu Aug 07, 2014 12:38 pm; edited 1 time in total |
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wraeth
Developer
Joined: 08 May 2007
Posts: 72
Location: Australia
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| Posted: Thu Aug 07, 2014 12:38 pm Post subject: |
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This information is being printed out by the kernels 'printk' function. You can disable this for normal booting by appending the 'quiet' option to your kernel command line.
To do this in GRUB2, you need to edit the file /etc/default/grub to contain
| Code: | | GRUB_CMDLINE_LINUX_DEFAULT="quiet" |
Once that's done, you need to regenerate your GRUB configuration file with
| Code: | mount /boot # only needed if you you have a separate /boot partition
grub2-mkconfig -o /boot/grub/grub.cfg |
Adding it to this variable, as opposed to GRUB_CMDLINE_LINUX means thatt the printk output is disabled for normal boots, but the 'quiet' option isn't added to GRUB's recovery boot options in case you need the information to help you troubleshoot an issue. |
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ShiroiKuma
n00b
Joined: 09 Nov 2012
Posts: 40
Location: Japan
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| Posted: Thu Aug 07, 2014 12:42 pm Post subject: |
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Thanks Wraeth, I finally found it though. I spend an hour looking, make a post and then find the solution 5 - 10 minutes after making a post.
Now I've learnt what quiet actually does.  |
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wraeth
Developer
Joined: 08 May 2007
Posts: 72
Location: Australia
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| Posted: Thu Aug 07, 2014 1:57 pm Post subject: |
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Glad you got this sorted, and enjoy your new system!  |
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Installing Gentoo
