quiet console loglevel (1-15)


Linux Kernel Configuration
└─>Kernel hacking
└─>printk and dmesg options
└─>quiet console loglevel (1-15)
In linux kernel since version 4.2 (release Date: 2015-08-30)  
loglevel to use when "quiet" is passed on the kernel commandline.

When "quiet" is passed on the kernel commandline this loglevel
will be used as the loglevel. IOW passing "quiet" will be the
equivalent of passing "loglevel=<CONSOLE_LOGLEVEL_QUIET>"