I recently bought a Dell XPS L502X. The internal card reader had some trouble detecting cards but I was able to fix it using the workaround explained at https://bugs.launchpad.net/ubuntu/+source/linux/+bug/995743
Now I can read my 8GB SDHC Card Class 10, but I am unable to detect a 4GB SDHC Class 4
I know that the sd is ok, because I can read it from my digital camera, and other computers too.
I post here, because I am interested in solve the problem using Ubuntu, but I have the same issue with the same memory on Windows too. (I have dual boot)
Does anyone have any idea? Thanks.