Comment 167 for bug 530277

I have the same problem in my Acer Aspire One Happy (Intel Atom 550, card reader ENE technology) running Ubuntu 11.10.
It can be fixed by including "acpiphp" module in /etc/modules.
After rebooting, then reading memory card, just simply plug it in in the card reader, and will pop up automatically.
I have documented the detail here:
http://waluyo-adi-siswanto.blogspot.com/2011/12/card-reader-acer-aspire-one-in-ubuntu.html