There is a workaround from
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/605043/comments/7

Simply add a "options sdhci debug_quirks=0x40" line into a new file
(e.g. card-reader.conf) in /etc/modprobe.d

** Tags added: fix workaround

** Description changed:

  The internal reader in my Acer Aspire 8943G laptop from O2 Micro
- manufacturer doesn't work at all. It doesn't mount any memory card nor
- recognize that a card has been inserted (system log doesn't show any new
- message when I insert or remove a card).
+ manufacturer doesn't work at all with Ubuntu 11.04 and 11.10. It doesn't
+ mount any memory card nor recognize that a card has been inserted
+ (system log doesn't show any new message when I insert or remove a
+ card).
  
  I have tried using A-DATA 16GB SDHC Class 6 and a very old 16MB long
  MemoryStick or whatever it was.
  
- I have also tried some workarounds posted all over the Internet
- including adding "options sdhci debug_quirks=0x40" into a configuration
- file in /etc/modprobe.d but it didn't work. Somewhere in the Internet,
- there had been also a linux driver for the O2 Micro SmartCard reader,
- but I don't really think that it is suitable for my card reader and,
- anyway, as the driver was quite old, the download link didn't work.
- 
- I tried Ubuntu Oneiric Alpha 2 daily build today and again, the card
- reader doesn't react on card insertion at all.
+ A workaround is adding "options sdhci debug_quirks=0x40" into a
+ configuration file in /etc/modprobe.d.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: linux-image-2.6.38-8-generic 2.6.38-8.42
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic x86_64
  NonfreeKernelModules: fglrx
  AlsaVersion:
-  Advanced Linux Sound Architecture Driver Version 1.0.24.
-  Compiled on May 23 2011 for kernel 2.6.38-8-generic (SMP).
+  Advanced Linux Sound Architecture Driver Version 1.0.24.
+  Compiled on May 23 2011 for kernel 2.6.38-8-generic (SMP).
  Architecture: amd64
  ArecordDevices:
-  **** List of CAPTURE Hardware Devices ****
-  card 0: Intel [HDA Intel], device 0: ALC670 Analog [ALC670 Analog]
-    Subdevices: 1/1
-    Subdevice #0: subdevice #0
+  **** List of CAPTURE Hardware Devices ****
+  card 0: Intel [HDA Intel], device 0: ALC670 Analog [ALC670 Analog]
+    Subdevices: 1/1
+    Subdevice #0: subdevice #0
  AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC0:  lukaschmela   2525 F.... pulseaudio
-                       lukaschmela   4749 F.... Lexicon.exe
+  USER        PID ACCESS COMMAND
+  /dev/snd/controlC0:  lukaschmela   2525 F.... pulseaudio
+                       lukaschmela   4749 F.... Lexicon.exe
  CRDA: Error: [Errno 2] Adresář nebo soubor neexistuje
  Card0.Amixer.info:
-  Card hw:0 'Intel'/'HDA Intel at 0xf8600000 irq 43'
-    Mixer name : 'Realtek ALC670'
-    Components : 'HDA:10ec0670,1025038b,00100002'
-    Controls      : 27
-    Simple ctrls  : 16
+  Card hw:0 'Intel'/'HDA Intel at 0xf8600000 irq 43'
+    Mixer name : 'Realtek ALC670'
+    Components : 'HDA:10ec0670,1025038b,00100002'
+    Controls      : 27
+    Simple ctrls  : 16
  Card1.Amixer.info:
-  Card hw:1 'Generic'/'HD-Audio Generic at 0xf8120000 irq 44'
-    Mixer name : 'ATI R6xx HDMI'
-    Components : 'HDA:1002aa01,00aa0100,00100200'
-    Controls      : 4
-    Simple ctrls  : 1
+  Card hw:1 'Generic'/'HD-Audio Generic at 0xf8120000 irq 44'
+    Mixer name : 'ATI R6xx HDMI'
+    Components : 'HDA:1002aa01,00aa0100,00100200'
+    Controls      : 4
+    Simple ctrls  : 1
  Card1.Amixer.values:
-  Simple mixer control 'IEC958',0
-    Capabilities: pswitch pswitch-joined penum
-    Playback channels: Mono
-    Mono: Playback [on]
+  Simple mixer control 'IEC958',0
+    Capabilities: pswitch pswitch-joined penum
+    Playback channels: Mono
+    Mono: Playback [on]
  Date: Mon Aug  1 23:25:42 2011
  InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
  MachineType: Acer Aspire 8943G
  ProcEnviron:
-  LANGUAGE=cs_CZ:en
-  LANG=cs_CZ.UTF-8
-  SHELL=/bin/bash
+  LANGUAGE=cs_CZ:en
+  LANG=cs_CZ.UTF-8
+  SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic 
root=UUID=099129b9-b3c5-446d-ad9b-b68a81006d99 ro splash quiet quiet splash 
vt.handoff=7
  RelatedPackageVersions:
-  linux-restricted-modules-2.6.38-8-generic N/A
-  linux-backports-modules-2.6.38-8-generic  N/A
-  linux-firmware                            1.52
+  linux-restricted-modules-2.6.38-8-generic N/A
+  linux-backports-modules-2.6.38-8-generic  N/A
+  linux-firmware                            1.52
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/11/2010
  dmi.bios.vendor: Phoenix
  dmi.bios.version: V1.06
  dmi.board.name: SM83-CP
  dmi.board.vendor: Acer
  dmi.board.version: Not Applicable
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: N/A
  dmi.modalias: 
dmi:bvnPhoenix:bvrV1.06:bd08/11/2010:svnAcer:pnAspire8943G:pvrNotApplicable:rvnAcer:rnSM83-CP:rvrNotApplicable:cvnAcer:ct10:cvrN/A:
  dmi.product.name: Aspire 8943G
  dmi.product.version: Not Applicable
  dmi.sys.vendor: Acer

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https://bugs.launchpad.net/bugs/819537

Title:
  O2 Micro integrated card reader doesn't work at all on Acer Aspire
  8943G

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