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[Nils Sabelstrom <nilssab@xxxxxxxxx>]

might this be a duplicate of this bug? 
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1280020

it's a different acer device, but using the same SD controller from what
I can find, according to that bugs comment thread the SD card reader
works in 14.04 with 3.13.0-8-generic #28-Ubuntu SMP kernel.

I shall try on my own Acer V5-171 with a Broadcaom BCM57765/57785 asap

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https://bugs.launchpad.net/bugs/1178131

Title:
  14e4:16bc  [Acer Aspire One 756] SD card slot doesn't work

Status in The Linux Kernel:
  Unknown
Status in “linux” package in Ubuntu:
  Triaged

Bug description:
  My SD Card reader will not work without reloading the tg3 module. When I insert an SD card, dmesg output:
  [ 409.712345] mmc0: Timeout waiting for hardware interrupt.
  [ 419.722227] mmc0: Timeout waiting for hardware interrupt.
  [ 429.732104] mmc0: Timeout waiting for hardware interrupt.
  [ 439.742025] mmc0: Timeout waiting for hardware interrupt.
  [ 443.841471] mmc0: Card removed during transfer!
  [ 443.841477] mmc0: Resetting controller.

  The type of SD card does not matter and it does not matter if an
  ethernet cable is plugged.

  With Ubuntu 11.10, which works fine out of the box. Dmesg does not
  show any error or warning.

  10.04: Does not work even when reloading the tg3 module. Dmesg reports error -84 during SD card init.
  12.04 32-bit: Works when reloading the tg3 module. Otherwise timeout errors occur.
  13.04 32-bit: same as above with 12.04.
  12.04 with 3.10.0-rc1 mainline kernel: same as with 12.04.

  WORKAROUND: setpci -s 00:1c.2 0x50.B=0x40

  WORKAROUND: setpci -s 00:1c.2 0x50.B=0x41

  WORKAROUND: Perform at a terminal:
  rmmod tg3
  modprobe tg3

  rmmod tg3:
  [ 447.384229] tg3 0000:04:00.0: PME# enabled
  [ 447.384258] tg3 0000:04:00.0: wake-up capability enabled by ACPI
  [ 447.417401] tg3 0000:04:00.0: PCI INT A disabled

  modprobe tg3:
  [ 475.816235] tg3.c:v3.121 (November 2, 2011)
  [ 475.819526] mmc0: new high speed SDHC card at address 0007
  [ 475.832068] tg3 0000:04:00.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18
  [ 475.832129] tg3 0000:04:00.0: setting latency timer to 64
  [ 475.839493] mmcblk0: mmc0:0007 SD08G 7.48 GiB
  [ 475.841628] mmcblk0: p1
  [ 475.880672] tg3 0000:04:00.0: eth0: Tigon3 [partno(BCM57785) rev 57785100] (PCI Express) MAC address b8:88:e3:42:5d:df
  [ 475.880680] tg3 0000:04:00.0: eth0: attached PHY is 57765 (10/100/1000Base-T Ethernet) (WireSpeed[1], EEE[1])
  [ 475.880685] tg3 0000:04:00.0: eth0: RXcsums[1] LinkChgREG[0] MIirq[0] ASF[0] TSOcap[1]
  [ 475.880690] tg3 0000:04:00.0: eth0: dma_rwctrl[00000001] dma_mask[64-bit]
  [ 475.908963] udevd[2073]: renamed network interface eth0 to eth1
  [ 475.916412] tg3 0000:04:00.0: irq 44 for MSI/MSI-X
  [ 475.916426] tg3 0000:04:00.0: irq 45 for MSI/MSI-X
  [ 475.916437] tg3 0000:04:00.0: irq 46 for MSI/MSI-X
  [ 476.486620] ADDRCONF(NETDEV_UP): eth1: link is not ready
  [ 476.487582] ADDRCONF(NETDEV_UP): eth1: link is not ready

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.2.0-41-generic-pae 3.2.0-41.66
  ProcVersionSignature: Ubuntu 3.2.0-41.66-generic-pae 3.2.42
  Uname: Linux 3.2.0-41-generic-pae i686
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 2.0.1-0ubuntu17.2
  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
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  stefan     2100 F.... pulseaudio
  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      : 23
     Simple ctrls  : 11
  Date: Thu May  9 09:42:43 2013
  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 064e:d251 Suyin Corp.
  MachineType: Acer AO756
  MarkForUpload: True
  ProcEnviron:
   LANGUAGE=de_DE:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-41-generic-pae root=UUID=e1e0405e-1b4d-4f0d-89f8-9324d70236c9 ro quiet splash acpi_backlight=vendor vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.2.0-41-generic-pae N/A
   linux-backports-modules-3.2.0-41-generic-pae  N/A
   linux-firmware                                1.79.4
  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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