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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