Christopher,

Sorry, same thing. One SDXC card mounts the other does not mount.

Results with:

Sep 16 15:32:28 tennekes kernel: [    0.000000] Linux version
4.8.0-040800rc6-generic (kernel@gloin) (gcc version 6.2.0 20160901 (Ubuntu
6.2.0-3ubuntu11) ) #201609121119 SMP Mon Sep 12 15:21:03 UTC 2016
Sep 16 15:32:28 tennekes kernel: [    0.000000] Command line:
BOOT_IMAGE=/boot/vmlinuz-4.8.0-040800rc6-generic
root=UUID=560e20f5-d2aa-48c1-ab12-55c2a34639f8 ro quiet splash vt.handoff=7

...

Sep 16 15:33:15 tennekes kernel: [   55.467439] mmc0: new ultra high speed
DDR50 SDXC card at address aaaa
Sep 16 15:33:15 tennekes kernel: [   55.472598] mmcblk0: mmc0:aaaa SL64G
59.5 GiB
Sep 16 15:33:15 tennekes kernel: [   55.487986]  mmcblk0: p1
Sep 16 15:33:15 tennekes udisksd[4687]: Mounted /dev/mmcblk0p1 at
/media/xxx/6337-6134 on behalf of uid 1000

...

Sep 16 15:33:25 tennekes udisksd[4687]: Cleaning up mount point
/media/xxx/6337-6134 (device 179:1 is not mounted)
Sep 16 15:33:25 tennekes udisksd[4687]: Unmounted /dev/mmcblk0p1 on behalf
of uid 1000
Sep 16 15:33:29 tennekes kernel: [   69.269981] mmc0: card aaaa removed

...

Sep 16 15:33:43 tennekes kernel: [   83.451445] mmc0: tuning execution
failed: -5
Sep 16 15:33:43 tennekes kernel: [   83.451457] mmc0: error -5 whilst
initialising SD card
Sep 16 15:33:44 tennekes kernel: [   83.892892] sdhci: Timeout waiting for
Buffer Read Ready interrupt during tuning procedure, falling back to fixed
sampling clock
Sep 16 15:33:44 tennekes kernel: [   83.894714] mmc0: tuning execution
failed: -5
Sep 16 15:33:44 tennekes kernel: [   83.894727] mmc0: error -5 whilst
initialising SD card

Best regards

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https://bugs.launchpad.net/bugs/1622376

Title:
  Mounting SDXC Cards unreliable

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Ubuntu 16.04 Lenovo Y700 laptop

  Using Sandisk SDXC Cards (camera/pictures) works for one card (mounts)
  but not for the other (does not mount). Cars and built-in reader works
  without any problems in this other (obviously) popular OS.

  Conclusion: both cards are OK, the reader is OK.

  The mounting card:

  [94183.755973] mmc0: new ultra high speed DDR50 SDXC card at address aaaa
  [94183.756646] mmcblk0: mmc0:aaaa SL64G 59.5 GiB
  [94183.770742] mmcblk0: p1
  udisksd[3993]: Mounted /dev/mmcblk0p1 at /media/xxx/6337-6134 on behalf of 
uid 1000
  .
  .
  .
  udisksd[3993]: Cleaning up mount point /media/xxx/6337-6134 (device 179:1 is 
not mounted)
  udisksd[3993]: Unmounted /dev/mmcblk0p1 on behalf of uid 1000
  [94251.132197] mmc0: card aaaa removed

  The failing card (does not fail when running under an alternative OS):

  [94804.132020] sdhci: Timeout waiting for Buffer Read Ready interrupt during 
tuning procedure, falling back to fixed sampling clock
  [94804.132100] mmc0: tuning execution failed
  [94804.132111] mmc0: error -5 whilst initialising SD card

  Curious...

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-36-generic 4.4.0-36.55
  ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
  Uname: Linux 4.4.0-36-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  hk         3842 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun Sep 11 20:12:15 2016
  HibernationDevice: RESUME=UUID=87c83c29-86d9-4674-a81c-4012e557565f
  InstallationDate: Installed on 2016-06-21 (82 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  Lsusb:
   Bus 002 Device 002: ID 8086:0a66 Intel Corp. 
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 8087:0a2b Intel Corp. 
   Bus 001 Device 002: ID 046d:c526 Logitech, Inc. Nano Receiver
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 80NV
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-36-generic.efi.signed 
root=UUID=560e20f5-d2aa-48c1-ab12-55c2a34639f8 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-36-generic N/A
   linux-backports-modules-4.4.0-36-generic  N/A
   linux-firmware                            1.157.3
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/29/2016
  dmi.bios.vendor: LENOVO
  dmi.bios.version: CDCN35WW
  dmi.board.asset.tag: NO Asset Tag
  dmi.board.name: Allsparks 5A
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0J40709 WIN
  dmi.chassis.asset.tag: NO Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo ideapad Y700-15ISK
  dmi.modalias: 
dmi:bvnLENOVO:bvrCDCN35WW:bd03/29/2016:svnLENOVO:pn80NV:pvrLenovoideapadY700-15ISK:rvnLENOVO:rnAllsparks5A:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrLenovoideapadY700-15ISK:
  dmi.product.name: 80NV
  dmi.product.version: Lenovo ideapad Y700-15ISK
  dmi.sys.vendor: LENOVO

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