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[ruda_porto <rudazz@xxxxxxxxx>]

The above workaround works for me, but I need to change the file name to
include extension  .conf, ex: sdhci.conf

Follow again the WORKAROUND:
  1. Add the following to /etc/modprobe.d/sdhci.conf: 
          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

It works fine to me :-)

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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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