FM / parameters

/sys/module/vt/parameters

Name	Size	Mode	Actions
color	4096	0644	edit dl rm
cur_default	4096	0644	edit dl rm
default_blu	4096	0644	edit dl rm
default_grn	4096	0644	edit dl rm
default_red	4096	0644	edit dl rm
default_utf8	4096	0644	edit dl rm
global_cursor_default	4096	0644	edit dl rm
italic	4096	0644	edit dl rm
underline	4096	0644	edit dl rm

Edit: /sys/module/vt/parameters/underline (4096B)

cmd: