file: /proc/sys/kernel/printk
variable: kernel.printk
Official reference

The four values in printk denote: console_loglevel, default_message_loglevel, minimum_console_loglevel and default_console_loglevel respectively.

These values influence printk() behavior when printing or logging error messages. See ‘man 2 syslog’ for more info on the different loglevels.

  • console_loglevel: messages with a higher priority than this will be printed to the console
  • default_message_loglevel: messages without an explicit priority will be printed with this priority
  • minimum_console_loglevel: minimum (highest) value to which console_loglevel can be set
  • default_console_loglevel: default value for console_loglevel