Index: share/man/man4/vt.4
===================================================================
--- share/man/man4/vt.4
+++ share/man/man4/vt.4
@@ -45,6 +45,8 @@
 .Xr loader.conf 5 :
 .Cd hw.vga.textmode=1
 .Cd kern.vty=vt
+.Cd kern.vt.fb.default_mode="<X>x<Y>"
+.Cd kern.vt.fb.modes.<connector>="<X>x<Y>"
 .Pp
 In
 .Xr loader.conf 5 or
@@ -203,6 +205,27 @@
 is used on computers that boot from BIOS, and
 .Nm
 is used on computers that boot from UEFI.
+.It Va kern.vt.fb.default_mode
+Set this value to a graphic mode to override the default mode picked by the
+.Nm
+backend. The mode is applied to all output connectors. This is currently
+only supported by the
+.Cm vt_fb
+backend when it's paired with a KMS
+.Pq Kernel Mode Setting
+video driver.
+.It Va kern.vt.fb.modes. Ns Pa connector_name
+Set this value to a graphic mode to override the default mode picked by the
+.Nm
+backend. This mode is applied to the output connector
+.Pa connector_name
+only. It has precedence over
+.Va kern.vt.fb.default_mode .
+This is currently only supported by the
+.Cm vt_fb
+backend when it's paired with a KMS
+.Pq Kernel Mode Setting
+video driver.
 .Sh KEYBOARD SYSCTL TUNABLES
 These settings control whether certain special key combinations are enabled or
 ignored.