Realtek SD reader mounting problems under Linux (Mint/Ubuntu)

This is a solution to SD mounting problems of a Realtek RTS5209 card read.
This affects my new Sony Vaio (SVE151G) with Linux Mint 15 but the solution can be extended to other operating systems/PCs (Ubuntu for example, and some HP notebooks).

Basically, when a SD card is inserted nothing happens… The device is not mounted and DMESG command says something like:

mmc0: error -110 whilst initialising SD card

This is how I solved the problem… :

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