Magento default behavior: With option
System > Configuration > Inventory > Display Out of Stock Products enabled, when configurable product has at least 1 associated simple product In Stock, then the rest simple products that are Out of Stock are "grayed out" but still visible.
In case when all simple products under the configurable are out of stock, no options(swatches) are shown whatsoever.
I would like to display all associated simple products, even if all of them are out of stock.
The same question has already been asked here, and I have tried it -
But the answer provided was at least incomplete, I get the same result as the author of the question in his comments. Any suggestions?