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… :