** Description changed:

  I am tracking down variables right now, and will update as I make
  further discoveries, but here's the story so far:
  
  After two non-consecutive suspend/resume cycles on a new Acer Aspire One
  AO756, the built-in SD card reader refuses to recognize any card, giving
  the following errors in dmesg:
  
  [25887.536273] mmc0: Timeout waiting for hardware interrupt.
  [25897.551037] mmc0: Timeout waiting for hardware interrupt.
  [25907.565804] mmc0: Timeout waiting for hardware interrupt.
  [25912.659727] mmc0: Card removed during transfer!
  [25912.659737] mmc0: Resetting controller.
  [25934.954354] mmc0: Timeout waiting for hardware interrupt.
  [25944.969143] mmc0: Timeout waiting for hardware interrupt.
  [25954.983873] mmc0: Timeout waiting for hardware interrupt.
  [25961.920074] mmc0: Card removed during transfer!
  [25961.920085] mmc0: Resetting controller.
  
- (This represents testing and remove two different cards.)
+ (This represents insertion and removal of two different cards.)
  
  After a suspend/resume cycle between the two aforementioned tests, I was
  able to get one card, a Transcend MicroSDHC 32 GB Class 4 card to not
  only be recognized, but automatically mount as expected, and finally was
  able to transfer the entire contents of the card (just over 30 GB) to
  the local HD.  Other cards I had available produced errors.  The dmesg
  from the working, followed by a nonworking card:
  
  [17033.338324] mmc0: new high speed SDHC card at address e624
- [17033.338655] mmcblk0: mmc0:e624 SU32G 29.7 GiB 
+ [17033.338655] mmcblk0: mmc0:e624 SU32G 29.7 GiB
  [17033.350297]  mmcblk0: p1
  [19371.234706] mmc0: card e624 removed
  [19571.454428] sdhci: Switching to 1.8V signalling voltage failed, retrying 
with S18R set to 0
  [19584.391746] mmc0: error -110 whilst initialising SD card
  [19598.266014] mmc0: error -110 whilst initialising SD card
  [19600.144345] sdhci: Switching to 1.8V signalling voltage failed, retrying 
with S18R set to 0
  [19609.164688] mmc0: error -110 whilst initialising SD card
  [19634.785422] mmc0: error -110 whilst initialising SD card
  
  I'm now going through and trying different things to see if I can
  isolate what's causing the different results.  In the later test, where
  nothing was recognized, that test included the MicroSDHC card that
  worked previously.  I'll update the notes if I can find what is causing
  the different behaviors.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-31-generic-pae 3.2.0-31.50
  ProcVersionSignature: Ubuntu 3.2.0-31.50-generic-pae 3.2.28
  Uname: Linux 3.2.0-31-generic-pae i686
  NonfreeKernelModules: wl
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu13
  Architecture: i386
  ArecordDevices:
-  **** List of CAPTURE Hardware Devices ****
-  card 0: PCH [HDA Intel PCH], device 0: ALC271X Analog [ALC271X Analog]
-    Subdevices: 1/1
-    Subdevice #0: subdevice #0
+  **** List of CAPTURE Hardware Devices ****
+  card 0: PCH [HDA Intel PCH], device 0: ALC271X Analog [ALC271X Analog]
+    Subdevices: 1/1
+    Subdevice #0: subdevice #0
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC0:  reaper     1675 F.... pulseaudio
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  reaper     1675 F.... pulseaudio
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 
not found.
  Card0.Amixer.info:
-  Card hw:0 'PCH'/'HDA Intel PCH at 0xc0600000 irq 43'
-    Mixer name : 'Intel PantherPoint HDMI'
-    Components : 'HDA:10ec0269,10250742,00100100 
HDA:80862806,80860101,00100000'
-    Controls      : 22
-    Simple ctrls  : 10
+  Card hw:0 'PCH'/'HDA Intel PCH at 0xc0600000 irq 43'
+    Mixer name : 'Intel PantherPoint HDMI'
+    Components : 'HDA:10ec0269,10250742,00100100 
HDA:80862806,80860101,00100000'
+    Controls      : 22
+    Simple ctrls  : 10
  Date: Mon Oct 15 12:35:00 2012
  HibernationDevice: RESUME=UUID=3ea96d5f-2b9f-4393-a404-ff919752cccc
  InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release i386 
(20120817.3)
  Lsusb:
-  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
-  Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
-  Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
-  Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
-  Bus 001 Device 003: ID 04f2:b335 Chicony Electronics Co., Ltd
+  Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+  Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
+  Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
+  Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub
+  Bus 001 Device 003: ID 04f2:b335 Chicony Electronics Co., Ltd
  MachineType: Acer AO756
  ProcEnviron:
-  TERM=xterm
-  PATH=(custom, user)
-  LANG=en_US.UTF-8
-  SHELL=/bin/bash
+  TERM=xterm
+  PATH=(custom, user)
+  LANG=en_US.UTF-8
+  SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-31-generic-pae 
root=UUID=c9af482b-1c0b-4a6d-ad40-ef86fdce18bb ro acpi_backlight=vendor quiet 
splash vt.handoff=7
  RelatedPackageVersions:
-  linux-restricted-modules-3.2.0-31-generic-pae N/A
-  linux-backports-modules-3.2.0-31-generic-pae  N/A
-  linux-firmware                                1.79.1
+  linux-restricted-modules-3.2.0-31-generic-pae N/A
+  linux-backports-modules-3.2.0-31-generic-pae  N/A
+  linux-firmware                                1.79.1
  SourcePackage: linux
  StagingDrivers: mei
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/26/2012
  dmi.bios.vendor: Acer
  dmi.bios.version: V1.02
  dmi.board.asset.tag: Type2 - Board Asset Tag
  dmi.board.name: Mimic
  dmi.board.vendor: Acer
  dmi.board.version: Type2 - Board Version
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.02
  dmi.modalias: 
dmi:bvnAcer:bvrV1.02:bd04/26/2012:svnAcer:pnAO756:pvrV1.02:rvnAcer:rnMimic:rvrType2-BoardVersion:cvnAcer:ct10:cvrV1.02:
  dmi.product.name: AO756
  dmi.product.version: V1.02
  dmi.sys.vendor: Acer

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https://bugs.launchpad.net/bugs/1067222

Title:
  Built-in SD card reader on Acer Aspire One AS756 intermittently
  operative

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