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Fedora 28 on Dell P24T netbook: SD card slot not working

The Dell Inspiron P24T comes with a micro SD card slot on the left side. When I insert a blank micro SD into the slot for use, Fedora doesn't recognize it. Gparted and Disks don't show it, either. Running "dmesg" from the Terminal shows these:

[ 584.781006] mmc0: tuning execution failed: -22 [ 584.781018] mmc0: error -22 whilst initialising SD card

How can I fix this and get my micro SD card reader working?