I have a DELL E7250 Latitude and after the upgrade from 15.04 my SD
cardreader cannot read the Kingston 64GB SDXC anymore. Same error
messages in dmesg:

[    1.886833] sdhci: Timeout waiting for Buffer Read Ready interrupt during 
tuning procedure, falling back to fixed sampling clock
[    1.888611] mmc0: tuning execution failed
[    1.888616] mmc0: error -5 whilst initialising SD card

lspci output fom kernel 4.2.0-18

01:00.0 SD Host controller: O2 Micro, Inc. SD/MMC Card Reader Controller (rev 
01) (prog-if 01)
        Subsystem: Dell Device 062d
        Flags: bus master, fast devsel, latency 0, IRQ 16
        Memory at f7101000 (32-bit, non-prefetchable) [size=4K]
        Memory at f7100000 (32-bit, non-prefetchable) [size=2K]
        Capabilities: [6c] Power Management version 3
        Capabilities: [48] MSI: Enable- Count=1/1 Maskable+ 64bit+
        Capabilities: [80] Express Endpoint, MSI 00
        Capabilities: [100] Virtual Channel
        Capabilities: [230] Latency Tolerance Reporting
        Capabilities: [240] L1 PM Substates
        Kernel driver in use: sdhci-pci

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https://bugs.launchpad.net/bugs/1509119

Title:
  Dell Venue pro 11 7140 card reader not working.

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