SD card slot not working on Windows 10 - Inspiron 3542

I've seen this problem reported for other Dell machines for a year now, since Windows 10 came out, but not for my model.

Since installing Windows 10, I can't use my SD card slot to write to, format, etc. a microSD card with adaptor. I can see the drive, read the card, and transfer files from it, but when I try to write I get an error message that the disk is write protected. It isn't. The exact same cards and adaptors work fine in my son's computer, and the cards work fine in my phone.

I just updated all my drivers and it still isn't working. When will Dell finally provide a fix for this? I can't even find any indication that they're working on it.