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diff --git a/share/man/man4/vt.4 b/share/man/man4/vt.4
--- a/share/man/man4/vt.4
+++ b/share/man/man4/vt.4
@@ -25,7 +25,7 @@
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
-.Dd November 21, 2025
+.Dd September 16, 2026
.Dt VT 4
.Os
.Sh NAME
@@ -64,6 +64,8 @@
.Cd kern.vt.kbd_panic= Ns Ar 0
.Cd kern.vt.enable_altgr= Ns Ar 0
.Cd kern.vt.enable_bell= Ns Ar 1
+.Cd kern.vt.mouse_scroll_lines= Ns Ar 3
+.Cd kern.vt.mouse_scroll_reverse= Ns Ar 0
.Sh DESCRIPTION
The
.Nm
@@ -120,6 +122,13 @@
time.
The Home and End keys jump to the beginning or end of the scrollback
buffer.
+By default, the mouse wheel can also be used to scroll up and down while
+scrollback mode is active.
+This behavior is controlled by the
+.Va kern.vt.mouse_scroll_lines
+and
+.Va kern.vt.mouse_scroll_reverse
+sysctl variables.
When finished reviewing, press the Scroll Lock key again to return to
normal use.
Some laptop keyboards lack a Scroll Lock key, and use a special function key
@@ -331,6 +340,16 @@
Disable printing kernel messages to the system console.
.It Va kern.vt.enable_bell
Enable the terminal bell.
+.It Va kern.vt.mouse_scroll_lines
+Set the number of lines to scroll per mouse wheel unit while Scroll Lock
+is enabled.
+Set to 0 to disable mouse wheel scrolling.
+The default is 3.
+.It Va kern.vt.mouse_scroll_reverse
+Set to a non-zero value to reverse the mouse wheel scroll direction while
+Scroll Lock is enabled.
+This behavior is sometimes called natural scrolling.
+The default is 0.
.El
.Sh FILES
.Bl -tag -width "/usr/share/vt/keymaps/*.kbd" -compact
diff --git a/sys/dev/vt/vt_core.c b/sys/dev/vt/vt_core.c
--- a/sys/dev/vt/vt_core.c
+++ b/sys/dev/vt/vt_core.c
@@ -132,6 +132,10 @@
static VT_SYSCTL_INT(debug, 0, "vt(4) 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");
+static VT_SYSCTL_INT(mouse_scroll_lines, 3,
+ "Lines per mouse wheel unit in scrollback mode (0 disables)");
+static VT_SYSCTL_INT(mouse_scroll_reverse, 0,
+ "Reverse mouse wheel direction in scrollback mode");
/* Slow down and dont rely on timers and interrupts */
static VT_SYSCTL_INT(slow_down, 0, "Non-zero make console slower and synchronous.");
@@ -2388,22 +2392,45 @@
struct vt_window *vw;
struct vt_font *vf;
term_pos_t size;
- int len, mark;
+ int len, mark, scroll_lines;
+ int64_t scroll_limit, scroll_offset;
vd = main_vd;
+ VT_LOCK(vd);
vw = vd->vd_curwindow;
vf = vw->vw_font;
- if (vw->vw_flags & (VWF_MOUSE_HIDE | VWF_GRAPHICS))
+ if (vw->vw_flags & (VWF_MOUSE_HIDE | VWF_GRAPHICS)) {
/*
* Either the mouse is disabled, or the window is in
* "graphics mode". The graphics mode is usually set by
* an X server, using the KDSETMODE ioctl.
*/
+ VT_UNLOCK(vd);
+ return;
+ }
+
+ if (vf == NULL) { /* Text mode. */
+ VT_UNLOCK(vd);
return;
+ }
- if (vf == NULL) /* Text mode. */
+ scroll_lines = vt_mouse_scroll_lines;
+ if ((vw->vw_flags & VWF_SCROLL) != 0 &&
+ (type == MOUSE_ACTION || type == MOUSE_MOTION_EVENT) && z != 0 &&
+ scroll_lines > 0) {
+ scroll_offset = -(int64_t)z * scroll_lines;
+ if (vt_mouse_scroll_reverse != 0)
+ scroll_offset = -scroll_offset;
+ scroll_limit = MIN((uint64_t)vw->vw_buf.vb_history_size,
+ (uint64_t)INT_MAX);
+ scroll_offset = MAX(scroll_offset, -scroll_limit);
+ scroll_offset = MIN(scroll_offset, scroll_limit);
+ vt_scroll(vw, (int)scroll_offset, VHS_CUR);
+ VT_UNLOCK(vd);
return;
+ }
+ VT_UNLOCK(vd);
/*
* TODO: add flag about pointer position changed, to not redraw chars

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