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[dexter1 <1514821@xxxxxxxxxxxxxxxxxx>]

I've updated the BIOS to version A08

tud254222 ~$ sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date
A08
10/19/2015

... but it does not address the issue: The SD card still cannot be found, even after taking it out and re-inserting.
Same messages in dmesg as previously noted:

tud254222 ~$ dmesg | grep mmc0
[    0.920781] mmc0: Unknown controller version (3). You may experience problems.
[    0.928195] mmc0: SDHCI controller on PCI [0000:01:00.0] using ADMA
[    1.183928] mmc0: tuning execution failed
[    1.183932] mmc0: error -5 whilst initialising SD card
[    1.452122] mmc0: tuning execution failed
[    1.452126] mmc0: error -5 whilst initialising SD card
[    1.728307] mmc0: tuning execution failed
[    1.728310] mmc0: error -5 whilst initialising SD card
[    2.024476] mmc0: tuning execution failed
[    2.024480] mmc0: error -5 whilst initialising SD card
[   81.325296] mmc0: tuning execution failed
[   81.325300] mmc0: error -5 whilst initialising SD card
[   81.637547] mmc0: tuning execution failed
[   81.637551] mmc0: error -5 whilst initialising SD card
[   81.961674] mmc0: tuning execution failed
[   81.961679] mmc0: error -5 whilst initialising SD card

I've retested with the same kernels as in post #4, no change in
behaviour of the SD card.

** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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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:
  Confirmed

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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