--- zzzz-none-000/linux-4.19.183/fs/proc/consoles.c	2021-03-24 10:07:39.000000000 +0000
+++ bcm63-7530ax-756/linux-4.19.183/fs/proc/consoles.c	2023-06-28 08:54:20.000000000 +0000
@@ -25,6 +25,7 @@
 		{ CON_PRINTBUFFER,	'p' },
 		{ CON_BRL,		'b' },
 		{ CON_ANYTIME,		'a' },
+		{ CON_MUTED,		'M' },
 	};
 	char flags[ARRAY_SIZE(con_flags) + 1];
 	struct console *con = v;