try a little harder to know if we must write the config file.

this is still not enough though

2 files changed, 9 insertions, 6 deletions

diff --git a/perl-install/Xconfig/main.pm b/perl-install/Xconfig/main.pm
index 3b1189e79..724dc111f 100644
--- a/perl-install/Xconfig/main.pm
+++ b/perl-install/Xconfig/main.pm
@@ -16,8 +16,7 @@ use any;
 sub configure_monitor {
     my ($in) = @_;
 
-    my $raw_X = Xconfig::xfree->read;
-    my $before = $raw_X->prepare_write;
+    my ($raw_X, $before) = Xconfig::xfree->read_and_prepare_write;
     Xconfig::monitor::configure($in, $raw_X, int($raw_X->get_devices)) or return;
     if ($raw_X->prepare_write ne $before) {
 	$raw_X->write;
@@ -30,12 +29,11 @@ sub configure_monitor {
 sub configure_resolution {
     my ($in) = @_;
 
-    my $raw_X = Xconfig::xfree->read;
+    my ($raw_X, $before) = Xconfig::xfree->read_and_prepare_write;
     my $X = { 
 	card => Xconfig::card::from_raw_X($raw_X),
 	monitors => [ $raw_X->get_monitors ],
     };
-    my $before = $raw_X->prepare_write;
     $X->{resolution} = Xconfig::resolution_and_depth::configure($in, $raw_X, $X->{card}, $X->{monitors}) or return;
     if ($raw_X->prepare_write ne $before) {
 	&write($raw_X, $X);
diff --git a/perl-install/Xconfig/xfree.pm b/perl-install/Xconfig/xfree.pm
index d1d45e406..eadceda3f 100644
--- a/perl-install/Xconfig/xfree.pm
+++ b/perl-install/Xconfig/xfree.pm
@@ -19,15 +19,20 @@ sub _conf_files() {
 ################################################################################
 # I/O ##########################################################################
 ################################################################################
-sub read {
+sub read_and_prepare_write {
     my ($class) = @_;
     my $file = find { -f $_ } _conf_files();
     my $raw_X = $class->new(Xconfig::parse::read_XF86Config($file));
+    my $before = $raw_X->prepare_write;
 
     if (my ($Keyboard) = $raw_X->get_InputDevices('Keyboard')) {
 	$Keyboard->{Driver}{val} = 'keyboard';
     }
-    $raw_X;
+    $raw_X, $before;
+}
+sub read {
+    my ($class) = @_;
+    first(read_and_prepare_write($class));
 }
 sub write {
     my ($raw_X, $o_file) = @_;