--- a/lib/GLPI/Agent/Tools/Screen.pm	2022-07-01 12:21:44.000000000 +0300
+++ b/lib/GLPI/Agent/Tools/Screen.pm	2022-07-21 18:21:57.332275628 +0300
@@ -29,7 +29,7 @@
     if ($self->{edid}->{serial_number2} && $self->{edid}->{serial_number2}->[0]) {
         $self->{_serial} = $self->{edid}->{serial_number2}->[0];
     } else {
-        $self->{_serial} = sprintf("%08x", $self->{edid}->{serial_number});
+        $self->{_serial} = sprintf("%08x", $self->{edid}->{serial_number} . $self->{edid}->{checksum});
     }
 
     # Setup manufacturer