Comment 15 for bug 777321

@François

in a new file /etc/modprobe.d/cardreader-firewire.conf (the file name is an example, choose what you want), add these instructions

options firewire-ohci quirks=0x10

(the module doesn't want the debug parameter on my e6520/natty 64bits)

Then launch
sudo update-initramfs -u

reboot and it should be ok. At least it works for me.