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[dexter1 <1514821@xxxxxxxxxxxxxxxxxx>]

I have found a workaround for the SD card controller in my DELL Latitude 7250 with a SDXC card. I came accross this page:
http://www.0xf8.org/2016/01/workaround-for-broken-o2-micro-sd-card-reader-support-since-linux-kernel-version-4-1-8/

By setting "sdhci.debug_quirks2=0x4" as default kernel parameter in the
grub configuration file, the 64GB Kingston SD card is now recognized and
functional. I tried to put this parameter in /etc/modprobe.d but the
controller does not see the SDXC card until it remove and add the
module.

I have wondered if i should spend the time and trouble in performing a
correct full git bisect as suggested by Christopher, but since Blackgr
has issued his report on the bug in his latitude 7450 in
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1523178 and already
did a full git bisect which is now investigated upstream in linux-mmc/sd
mailing list and the fact that i have a workaround, i see no pressing
need to duplicate this.

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https://bugs.launchpad.net/bugs/1514821

Title:
  SD card reader on Dell E7250 doesn't work in Ubuntu 15.10

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I booted the machine with the SD card removed. I logged into Unity, inserted the SD card and saw the error messages popping up in dmesg:
   sdhci: Timeout waiting for Buffer Read Ready interrupt during tuning procedure, falling back to fixed sampling clock
   mmc0: tuning execution failed
   mmc0: error -5 whilst initialising SD card

  I was expecting to see the SD card mounted in the Unity actionbar,
  like in 15.04.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-18-generic 4.2.0-18.22
  ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3
  Uname: Linux 4.2.0-18-generic x86_64
  ApportVersion: 2.19.1-0ubuntu4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  <username>   1864 F.... pulseaudio
   /dev/snd/controlC0:  <username>   1864 F.... pulseaudio
  Date: Tue Nov 10 13:56:18 2015
  HibernationDevice: RESUME=UUID=a507736b-2856-48bd-ae57-a3a1a678c150
  InstallationDate: Installed on 2015-06-19 (144 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Dell Inc. Latitude E7250
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-18-generic root=UUID=fe9cd698-4d8c-4ea1-9cce-af132d859b83 ro quiet splash vt.handoff=7
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-18-generic N/A
   linux-backports-modules-4.2.0-18-generic  N/A
   linux-firmware                            1.149.1
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: Upgraded to wily on 2015-11-02 (8 days ago)
  dmi.bios.date: 09/01/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A07
  dmi.board.asset.tag: TUD254222
  dmi.board.name: 0TVD2T
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.asset.tag: TUD254222
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA07:bd09/01/2015:svnDellInc.:pnLatitudeE7250:pvr:rvnDellInc.:rn0TVD2T:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E7250
  dmi.sys.vendor: Dell Inc.

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