Tried this (a mix of above workarounds) and it worked for the first use
of the SD card reader, but if remove the card and put it in again, it
isn't recognized. I must do this workaround one more time to make sd
card reader working again.

1. Add following to /etc/rc.local:
   setpci -s 00:1c.2 0x50.B=0x41

2. Add to /etc/apm/resume.d/21aspm:
   setpci -s 00:1c.2 0x50.B=0x41

3. Add to /etc/modprobe.d/sdhci:
   options sdhci debug_quirks2=4

4. Regenerate initrd:
   sudo update-initramfs -u -k all

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https://bugs.launchpad.net/bugs/1307674

Title:
  [MacBookPro10,2] Broadcom BCM57765/57785 SDXC/MMC Card Reader doesn't
  work for Ultra High Speed SD cards

Status in linux package in Ubuntu:
  Triaged

Bug description:
  I have a Broadcom BCM57765/57785 SDXC/MMC Card Reader internally in my
  MacBook Pro Retina 13", and it does not work.

  WORKAROUND:
    1. Add the following to /etc/modprobe.d/sdhci: options sdhci debug_quirks2=4
    2. Re-generate initrd: sudo update-initramfs -u -k all
    3. Reboot (or reload sdhci module: sudo rmmod sdhci-pci sdhci ; sudo 
modprobe sdhci ; sudo modprobe sdhci-pci)

  Upstream URL: http://thread.gmane.org/gmane.linux.kernel.mmc/27194

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-24-generic 3.13.0-24.46
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.14.1-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  mag        2387 F.... pulseaudio
                        mag        2896 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Mon Apr 14 21:30:38 2014
  HibernationDevice: RESUME=UUID=060f761f-a7ab-442b-9186-51ab74e03896
  InstallationDate: Installed on 2013-09-14 (212 days ago)
  InstallationMedia: Kubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: Apple Inc. MacBookPro10,2
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: \EFI\linux\vmlinuz-3.13.0-24-generic ro 
root=UUID=61126328-c29e-40a6-913f-7f8690a455bc quiet splash $vt_handoff 
initrd=EFI\linux\initrd.img-3.13.0-24-generic
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127
  SourcePackage: linux
  UpgradeStatus: Upgraded to trusty on 2014-04-11 (3 days ago)
  dmi.bios.date: 11/16/2012
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP102.88Z.0106.B03.1211161133
  dmi.board.asset.tag: Base Board Asset Tag#
  dmi.board.name: Mac-AFD8A9D944EA4843
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro10,2
  dmi.chassis.type: 10
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-AFD8A9D944EA4843
  dmi.modalias: 
dmi:bvnAppleInc.:bvrMBP102.88Z.0106.B03.1211161133:bd11/16/2012:svnAppleInc.:pnMacBookPro10,2:pvr1.0:rvnAppleInc.:rnMac-AFD8A9D944EA4843:rvrMacBookPro10,2:cvnAppleInc.:ct10:cvrMac-AFD8A9D944EA4843:
  dmi.product.name: MacBookPro10,2
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.

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