I am having the same problems. I spent days with my company's tech support before finding this thread. When is A18 being shipped.
It's inadmissible on the part of Dell to have such poor quality control on the release of a new BIOS. Please release A18 with a fix ASAP
So, I after day of fighting this bloody SD card reader i have stumbled on this thread, thanks guys!!
I was suspecting this is the BIOS issue, as I had the motherboard replaced by Dell technician on site and he did solve the problem.
I had the Dell update utility prompting me to update few drivers, including BIOS, after which I have lost the SD card reader, however I was not aware until I was on the road. (in the office I have a dock and desk top card reader). I assumed SD card driver as in the past Dell managed to bork the SD card driver as well, so I tried rolling back and etc, to no avil.
Restoring the BIOS to A15 gave me the SD card back
Now we have May of 2016 and no sight of the new BIOS ?
Dell really should get their act together, this is 1.5K pound machine! FGS.
I dont idea, but Dell has released update A18 on May 04, same issue, Dell replaced my motherboard and SD is working under A15 version, when I upgraded Bios to A17, SD reader not working, now I update Bios to A18 version and SD is alive.
After flashing A18 BIOS I have problem with hibernation. Sometime my e7440 cannot come out from hibernation and it makes "fresh" start of Windows. The same issue on Win 10 Pro & Win 8.1 Pro. In Windows event log I get message, that it is 0xC0000411 error. Fresh Windows installation, drivers from Dell site - problem still exist.