Issue with sorting by post date and custom post type

Have you played with the other arguments available to WP_Query?

$slideshow_args = array(
    'post_type' => 'slide',
    'posts_per_page' => '10',
    'orderby'        => 'post_date',
    'order'          => 'DESC'
);
$slideshow = new WP_Query( $slideshow_args );

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