i have a lenovo g470 and inserting the sd card into the built-in sd card reader and it doesn't do anything. but I tried connecting my celphone with mass storage via USB and the card is detected.
Just after inserting your sd card, do this using root:
echo 1 > /sys/bus/pci/rescan
For me it helps...
I have the same laptop and need to build an extra driver :
Where to to track in enters the mainline now ?