dolfyn, to clarify, what is the full manufacturer and model of the
working, and non-working card?

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  Mounting SDXC Cards unreliable

Status in linux package in Ubuntu:

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


  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
   /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 
   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
   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) 03/29/2016
  dmi.bios.vendor: LENOVO
  dmi.bios.version: CDCN35WW
  dmi.board.asset.tag: NO Asset Tag 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:bvnLENOVO:bvrCDCN35WW:bd03/29/2016:svnLENOVO:pn80NV:pvrLenovoideapadY700-15ISK:rvnLENOVO:rnAllsparks5A:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrLenovoideapadY700-15ISK: 80NV
  dmi.product.version: Lenovo ideapad Y700-15ISK
  dmi.sys.vendor: LENOVO

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