diff --git a/usr.sbin/bhyve/bhyve.8 b/usr.sbin/bhyve/bhyve.8
--- a/usr.sbin/bhyve/bhyve.8
+++ b/usr.sbin/bhyve/bhyve.8
@@ -22,7 +22,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd November 20, 2023
+.Dd December 29, 2023
 .Dt BHYVE 8
 .Os
 .Sh NAME
@@ -778,7 +778,7 @@
 A display resolution, width and height, respectively.
 If not specified, a default resolution of 1024x768 pixels will be used.
 Minimal supported resolution is 640x480 pixels,
-and maximum is 1920x1200 pixels.
+and maximum is 3840x2160 pixels.
 .It Cm vga= Ns Ar vgaconf
 Possible values for this option are
 .Cm io
diff --git a/usr.sbin/bhyve/pci_fbuf.c b/usr.sbin/bhyve/pci_fbuf.c
--- a/usr.sbin/bhyve/pci_fbuf.c
+++ b/usr.sbin/bhyve/pci_fbuf.c
@@ -312,26 +312,23 @@
 	}
 
 	value = get_config_value_node(nvl, "w");
-	if (value != NULL) {
-		sc->memregs.width = atoi(value);
-		if (sc->memregs.width > COLS_MAX) {
-			EPRINTLN("fbuf: width %d too large", sc->memregs.width);
-			return (-1);
-		}
-		if (sc->memregs.width == 0)
-			sc->memregs.width = 1920;
-	}
+	if (value != NULL)
+		sc->memregs.width = strtol(value, NULL, 10);
 
 	value = get_config_value_node(nvl, "h");
-	if (value != NULL) {
-		sc->memregs.height = atoi(value);
-		if (sc->memregs.height > ROWS_MAX) {
-			EPRINTLN("fbuf: height %d too large",
-			    sc->memregs.height);
-			return (-1);
-		}
-		if (sc->memregs.height == 0)
-			sc->memregs.height = 1080;
+	if (value != NULL)
+		sc->memregs.height = strtol(value, NULL, 10);
+
+	if (sc->memregs.width > COLS_MAX ||
+	    sc->memregs.height > ROWS_MAX) {
+		EPRINTLN("fbuf: max resolution is %ux%u", COLS_MAX, ROWS_MAX);
+		return (-1);
+	}
+	if (sc->memregs.width < COLS_MIN ||
+	    sc->memregs.height < ROWS_MIN) {
+		EPRINTLN("fbuf: minimum resolution is %ux%u",
+		    COLS_MIN, ROWS_MIN);
+		return (-1);
 	}
 
 	value = get_config_value_node(nvl, "password");