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I have an embedded Linux system, with /proc/cmdline containing console=<uart device> and earlycon=<uart device>. Shortly after each boot, a getty service will turn <uart device> into an interactive console. If I disable the getty service, I would like the console to stop printing messages once everything is initialized. However, I still see kernel messages being printed indfinitely when the getty service disabled. What is printing these kernel messages (is it a service, a kernel cmdline option, etc)? How do I stop kernel messages from being printed to console indefinitely, without recompiling the kernel? Is there a service I can kill to stop the kernel messages?

Ken Lin
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  • Does this answer your question? [Change default console loglevel during boot up](https://stackoverflow.com/questions/16390004/change-default-console-loglevel-during-boot-up) – sawdust Aug 24 '23 at 23:07
  • Or change the `console=` command line parameter to some other device. "*a getty service will turn into an interactive console*" -- You're (incorrectly) conflating "*console*" and "login terminal". – sawdust Aug 24 '23 at 23:13
  • `dmesg -n 1` will prevent all messages except emergency (panic) messages going to the console. – Ian Abbott Aug 25 '23 at 10:30
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    In util-linux v2.20 onwards' `dmesg`, `dmesg -D` will disable printing of the messages to the console completely, but that is not currently supported by busybox's `dmesg`. – Ian Abbott Aug 25 '23 at 10:41
  • Do you have `CONFIG_VT_HW_CONSOLE_BINDING` enabled in your kernel config? – dimich Aug 25 '23 at 13:17

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