(To be placed in the X child theme - /framework/views/global ) Remove all h1 tags that wrap the logo, to prevent the duplicate h1 tag error, which damages SEO. Also includes the alt tag in the link "Logo".

_brand.php

<?php

// VIEWS/GLOBAL/_BRAND.PHP
// -----------------------------------------------------------------------------
// Outputs the brand.
// =============================================================================

$site_name        = get_bloginfo( 'name' );
$site_description = get_bloginfo( 'description' );
$logo             = x_make_protocol_relative( x_get_option( 'x_logo' ) );
$site_logo        = '<img src="' . $logo . '" alt="' . $site_description . '">';

?>

<a href="<?php echo home_url( '/' ); ?>" class="<?php x_brand_class(); ?>" title="<?php echo $site_description; ?>" alt="Logo">
  <?php echo ( $logo == '' ) ? $site_name : $site_logo; ?>
</a>