Maybe its a combo of Neolithic and Indo-European (at least in Euroland);
Neolithic Ötzi already had the rs1426654 mutation (light skin) at ~3300 BC + earlier;
''A111T set by the finding that the Alpine “iceman” dated to 5.3 kya was homozygous for this variant''
Keller et al 2012 - p.4
But since a frequency is attached to it (the higher the lighter) maybe the Neolithic amount was lower than the Indo-Europeans;
Because the distribution of A111T (rs1426654) clearly mirrors the Indo-European range; No doubt about that;
And Loschbour (hunter-gatherer) was darker (skin pig) than Stuttgart (farmers-chick) i.e. Neolithic farmers and than the Indo-Europeans;