diff --git a/share/man/man4/vt.4 b/share/man/man4/vt.4
index 4c115b68a80d..d3d3c4b38013 100644
--- a/share/man/man4/vt.4
+++ b/share/man/man4/vt.4
@@ -50,6 +50,7 @@ In
 .Cd kern.vt.color.<colornum>.rgb="<colorspec>"
 .Cd kern.vt.fb.default_mode="<X>x<Y>"
 .Cd kern.vt.fb.modes.<connector>="<X>x<Y>"
+.Cd kern.vt.slow_down=<delay>"
 .Cd screen.font="<X>x<Y>"
 .Pp
 In
@@ -266,6 +267,16 @@ It will contain a list of connectors and their associated tunables.
 This is currently only supported by the
 .Cm vt_fb
 backend when it is paired with a KMS video driver.
+.It Va kern.vt.slow_down
+When debugging the kernel on modern laptops, the screen is often
+the only available console, and relevant information will scroll
+out of view before it can be captured by eye or camera.
+.Pp
+Setting
+.Va kern.vt.slow_down
+to a non-zero number will make console output synchronous (ie:
+not dependent on timers and interrupts) and slow it down in proportion
+to the number.
 .It Va screen.font
 Set this value to the base name of the desired font file located in
 .Pa /boot/fonts .
diff --git a/sys/dev/vt/vt_core.c b/sys/dev/vt/vt_core.c
index 87020b6e6f19..1be98466112e 100644
--- a/sys/dev/vt/vt_core.c
+++ b/sys/dev/vt/vt_core.c
@@ -132,6 +132,9 @@ static VT_SYSCTL_INT(debug, 0, "vt(9) debug level");
 static VT_SYSCTL_INT(deadtimer, 15, "Time to wait busy process in VT_PROCESS mode");
 static VT_SYSCTL_INT(suspendswitch, 1, "Switch to VT0 before suspend");
 
+/* Slow down and dont rely on timers and interrupts */
+static VT_SYSCTL_INT(slow_down, 0, "Non-zero make console slower and synchronous.");
+
 /* Allow to disable some keyboard combinations. */
 static VT_SYSCTL_INT(kbd_halt, 1, "Enable halt keyboard combination.  "
     "See kbdmap(5) to configure.");
@@ -1657,6 +1660,12 @@ vtterm_done(struct terminal *tm)
 		}
 		vd->vd_flags &= ~VDF_SPLASH;
 		vt_flush(vd);
+	} else if (vt_slow_down > 0) {
+		int i, j;
+		for (i = 0; i < vt_slow_down; i++) {
+			for (j = 0; j < 1000; j++)
+				vt_flush(vd);
+		}
 	} else if (!(vd->vd_flags & VDF_ASYNC)) {
 		vt_flush(vd);
 	}