I just got the same issue on a Dell Latitude E5550 using 16.04.1 (kernel
4.4.0-57-generic).

The workaround described above works. For people who may be in a similar
situation:

    sudo rmmod sdhci_pci sdhci_acpi
    sudo rmmod sdhci
    sudo modprobe sdhci debug_quirks2="0x10000"
    sudo modprobe sdhci_pci

I can then access a 64GB Micro SDXC card (through an SD card adapter)

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https://bugs.launchpad.net/bugs/1523178

Title:
  1217:8520 [Dell Latitude E7450] O2 Micro, SD/MMC Card Reader doesn't
  work

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