This post lists the command that disables debug messages from getting printed to the console.
Execute this on the console to stop the messages:
Execute this on the console to start the messages:
Execute this to read the current level:
You'll see four numbers. The first number is the current log level. You set this. The second is the default log level. The third is the lowest value you can set the log level, typically 1 and the last is what the log level is at boot.
1. What "6" (and the other numbers mean) is described here: link. For reference (table listed at link):