Comment 3 for bug 103714

http://sourceforge.net/forum/forum.php?thread_id=1717110&forum_id=669719 - this brings some light into the question, as well as this http://ubuntuforums.org/showthread.php?p=2653995. By all means,this is not a bug in Ubuntu but in the upstream driver, and it will have no effect as soon as Ubuntu uses 2.6.22 kernel. Also, upstream knows about it.
(workaround:
-Download the latest SVN version
-Open the sdricoh_cs.c file
-find the reference to protocol.h
-comment out all the if kernel_version stuff around it
-make sure that sd.h is not commented out
-make, sudo make install
credits: evilmonkey of ubuntuforums)