Comment 1 for bug 55507

Ok, reading here (http://mmc.drzeus.cx/wiki/Controllers/TexasInstruments/FlashMedia)
I found a partial workaround using
sudo setpci -s 06.3 4c=0x22

Then when I insert the card the driver react again to the insertion:

[ 156.431818] mmcblk0: mmc2:494e SD 493568KiB
[ 156.431846] mmcblk0: p1

However the card is not automatically mounted as it was before in Dapper, so maybe there's something else related. And however it is stil open the question why in dapper I didn't need to use setpci (maybe it was hardcoded in some way?)