Hello Christopher,

Thanks for the tips. Please refer to the bisect log

git bisect start 'Ubuntu-4.2.0-19.23' 'Ubuntu-4.1.0-3.3'
# good: [b953c0d234bc72e8489d3bf51a276c5c4ec85345] Linux 4.1
git bisect good b953c0d234bc72e8489d3bf51a276c5c4ec85345
# good: [3d9f96d850e4bbfae24dc9aee03033dd77c81596] Merge tag 'armsoc-dt' of 
git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
git bisect good 3d9f96d850e4bbfae24dc9aee03033dd77c81596
# good: [93899e39e86bfc021a190a9c26e8e516561f2756] Merge 
git://www.linux-watchdog.org/linux-watchdog
git bisect good 93899e39e86bfc021a190a9c26e8e516561f2756
# good: [7c764cec3703583247c4ab837c652975a3d41f4b] Merge 
git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
git bisect good 7c764cec3703583247c4ab837c652975a3d41f4b
# skip: [a0f195ea58d336cf32e3b15bba2f2b98dcc53c01] UBUNTU: SAUCE: (no-up) Allow 
filtering of cpufreq drivers
git bisect skip a0f195ea58d336cf32e3b15bba2f2b98dcc53c01
# bad: [aa608500538d801d77adc768e8bd07e73c817795] mei: me: d0i3: exit d0i3 on 
driver start and enter it on stop
git bisect bad aa608500538d801d77adc768e8bd07e73c817795
# good: [42c7443496288aab3504a2e9dc61930cc96f92a5] memory-hotplug: add 
hot-added memory ranges to memblock before allocate node_data for a node.
git bisect good 42c7443496288aab3504a2e9dc61930cc96f92a5
# bad: [392bd716c9fd3719eb44a06106f45488ec266fe2] UBUNTU: SAUCE: AUFS
git bisect bad 392bd716c9fd3719eb44a06106f45488ec266fe2
# bad: [a54023dd9723880fa089e8740d23145368a30234] UBUNTU: [debian] Use 
SRCPKGNAME as prefix for indep linux headers package
git bisect bad a54023dd9723880fa089e8740d23145368a30234
# good: [8fd1f7a1c4bbfb43f3f17d12f5c60925ebd9dd6c] svcrdma: Change maximum 
server payload back to RPCSVC_MAXPAYLOAD
git bisect good 8fd1f7a1c4bbfb43f3f17d12f5c60925ebd9dd6c
# bad: [001fc2f5d7ee719cf698eee845bc95d468b16380] phylib: fix device deletion 
order in mdiobus_unregister()
git bisect bad 001fc2f5d7ee719cf698eee845bc95d468b16380
# bad: [218014334367fca6910477b2430dfa6680eebdf7] iommu/tegra-smmu: 
Parameterize number of TLB lines
git bisect bad 218014334367fca6910477b2430dfa6680eebdf7
# good: [4f7760e963db10618dd3617bcf6254d896094e37] workqueue: Make 
flush_workqueue() available again to non GPL modules
git bisect good 4f7760e963db10618dd3617bcf6254d896094e37
# bad: [149faccaa3a057a07c6029f7d9d74bb3d163492c] mmc: sdhci: also get preset 
value and driver type for MMC_DDR52
git bisect bad 149faccaa3a057a07c6029f7d9d74bb3d163492c
# good: [89234d155665290f6e84bba9be37c8536a594d32] fs: Don't dump core if the 
corefile would become world-readable.
git bisect good 89234d155665290f6e84bba9be37c8536a594d32
# bad: [9a139a471fc6c0e91fbf794df3f4ded9ad5fd31a] mmc: sdhci-of-esdhc: add 
workaround for pre divider initial value
git bisect bad 9a139a471fc6c0e91fbf794df3f4ded9ad5fd31a
# bad: [e6c69099f63c84e1825c0f742a76ff4a8afeaa9b] mmc: sdhci-pci: set the clear 
transfer mode register quirk for O2Micro
git bisect bad e6c69099f63c84e1825c0f742a76ff4a8afeaa9b
# first bad commit: [e6c69099f63c84e1825c0f742a76ff4a8afeaa9b] mmc: sdhci-pci: 
set the clear transfer mode register quirk for O2Micro

Thanks

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

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https://bugs.launchpad.net/bugs/1523178

Title:
  SD card reader on Dell E7450 doesn't work in Ubuntu 15.10

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