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Ubuntu 14.04LTS: Broadcom BCM57765/57785 SDXC/MMC Card Reader

For any Linux system using the BCM57765/57785 SDXC/MMC reader, do the following to fix mounting & reading SD cards:

  1. Add a comand to /etc/rc.local:
    sudo nano /etc/rc.local     # add the following line above "exit 0"
    setpci -s 00:1c.2 0x50.B=0x41
  2. Add the same comand to /etc/apm/resume.d/21aspm (which does not exist yet):
    sudo nano /etc/apm/resume.d/21aspm
    setpci -s 00:1c.2 0x50.B=0x41
  3. Add a line to /etc/modprobe.d/sdhci (which may not exist yet):
    sudo nano /etc/modprobe.d/sdhci     # add the following to this file
    # For BCM57765/57785 SDXC/MMC reader
    options sdhci debug_quirks2=4
  4. run the follwing command to regenerate initrd:
    sudo update-initramfs -u -k all
  5. RESTART SYSTEM

References: