4 files changed, 36 insertions, 9 deletions
diff --git a/perl-install/Xconfig/main.pm b/perl-install/Xconfig/main.pm
index 3dd95f195..1e11b2b49 100644
--- a/perl-install/Xconfig/main.pm
+++ b/perl-install/Xconfig/main.pm
@@ -16,9 +16,14 @@ use any;
 sub configure_monitor {
     my ($in, $raw_X) = @_;
 
+    my $before = $raw_X->prepare_write;
     Xconfig::monitor::configure($in, $raw_X) or return;
-    $raw_X->write;
-    'config_changed';
+    if ($raw_X->prepare_write ne $before) {
+	$raw_X->write;
+	'config_changed';
+    } else {
+	'';
+    }
 }
 
 sub configure_resolution {
@@ -26,9 +31,14 @@ sub configure_resolution {
 
     my $card = Xconfig::card::from_raw_X($raw_X);
     my $monitor = Xconfig::monitor::from_raw_X($raw_X);
+    my $before = $raw_X->prepare_write;
     Xconfig::resolution_and_depth::configure($in, $raw_X, $card, $monitor) or return;
-    $raw_X->write;
-    'config_changed';
+    if ($raw_X->prepare_write ne $before) {
+	$raw_X->write;
+	'config_changed';
+    } else {
+	'';
+    }
 }
 
 
@@ -134,11 +144,15 @@ sub configure_chooser {
 	monitor => $raw_X->get_monitors && Xconfig::monitor::from_raw_X($raw_X),
 	resolution => scalar eval { $raw_X->get_resolution },
     };
-    my ($ok, $modified) = configure_chooser_raw($in, $raw_X, $do_pkgs, $options, $X);
-
-    $modified && may_write($in, $raw_X, $X, $ok) or return;
+    my $before = $raw_X->prepare_write;
+    my ($ok) = configure_chooser_raw($in, $raw_X, $do_pkgs, $options, $X);
 
-    'config_changed';
+    if ($raw_X->prepare_write ne $before) {
+	may_write($in, $raw_X, $X, $ok) or return;
+	'config_changed';
+    } else {
+	'';
+    }
 }
 
 sub configure_everything_or_configure_chooser {
diff --git a/perl-install/Xconfig/parse.pm b/perl-install/Xconfig/parse.pm
index 36aad26f3..ae270b9e8 100644
--- a/perl-install/Xconfig/parse.pm
+++ b/perl-install/Xconfig/parse.pm
@@ -13,9 +13,14 @@ sub read_XF86Config {
     $raw_X;
 }
 
+sub prepare_write_XF86Config {
+    my ($raw_X) = @_;
+    map { raw_to_string(before_to_string({ %$_ }, 0)) } @$raw_X;
+}
+
 sub write_XF86Config {
     my ($raw_X, $file) = @_;
-    my @blocks = map { raw_to_string(before_to_string({ %$_ }, 0)) } @$raw_X;
+    my @blocks = prepare_write_XF86Config($raw_X);
     @blocks ? output($file, @blocks) : unlink $file;
 }
 
diff --git a/perl-install/Xconfig/xfree.pm b/perl-install/Xconfig/xfree.pm
index 8df42bd8a..df6c0d3e0 100644
--- a/perl-install/Xconfig/xfree.pm
+++ b/perl-install/Xconfig/xfree.pm
@@ -20,6 +20,10 @@ sub write {
     $both->{xfree3} ? $both->{xfree3}->write($o_xfree3_file) : unlink($o_xfree3_file);
     $both->{xfree4} ? $both->{xfree4}->write($o_xfree4_file) : unlink($o_xfree4_file);
 }
+sub prepare_write {
+    my ($both) = @_;
+    ($both->{xfree4} || $both->{xfree3})->prepare_write;
+}
 
 sub empty_config {
     my ($class) = @_;
diff --git a/perl-install/Xconfig/xfreeX.pm b/perl-install/Xconfig/xfreeX.pm
index b6223a7fa..7d830ddee 100644
--- a/perl-install/Xconfig/xfreeX.pm
+++ b/perl-install/Xconfig/xfreeX.pm
@@ -26,6 +26,10 @@ sub write {
     rename $file, "$file.old";
     Xconfig::parse::write_XF86Config($raw_X, $file);
 }
+sub prepare_write {
+    my ($raw_X) = @_;
+    join('', Xconfig::parse::prepare_write_XF86Config($raw_X));
+}
 
 
 my @monitor_fields = qw(VendorName ModelName HorizSync VertRefresh);