whith this kernel(http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.0-oneiric/) 
cardreader not working too on Kubuntu 12.10...
dmesg says:
[   35.460581] ehci_hcd 0000:00:1a.0: BAR 0: set to [mem 0xc0609000-0xc06093ff] 
(PCI address [0xc0609000-0xc06093ff])
[   35.460612] ehci_hcd 0000:00:1a.0: restoring config space at offset 0xf (was 
0x100, writing 0x107)
[   35.460645] ehci_hcd 0000:00:1a.0: restoring config space at offset 0x1 (was 
0x2900000, writing 0x2900002)
[   35.460747] ehci_hcd 0000:00:1a.0: PME# disabled
[   35.460762] ehci_hcd 0000:00:1a.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
[   35.460772] ehci_hcd 0000:00:1a.0: setting latency timer to 64
[   42.215782] ehci_hcd 0000:00:1a.0: PCI INT A disabled
[   42.215844] ehci_hcd 0000:00:1a.0: PME# enabled
[   72.736678] mmc0: Timeout waiting for hardware interrupt.
[   72.736689] sdhci: =========== REGISTER DUMP (mmc0)===========
[   72.736738] sdhci: Sys addr: 0x00000000 | Version:  0x00001502
[   72.736747] sdhci: Blk size: 0x00000000 | Blk cnt:  0x00000000
[   72.736756] sdhci: Argument: 0x00000c00 | Trn mode: 0x00000000
[   72.736765] sdhci: Present:  0x1eff0001 | Host ctl: 0x00000005
[   72.736773] sdhci: Power:    0x0000000f | Blk gap:  0x00000000
[   72.736782] sdhci: Wake-up:  0x00000000 | Clock:    0x0000fa07
[   72.736791] sdhci: Timeout:  0x00000000 | Int stat: 0x00000000
[   72.736800] sdhci: Int enab: 0x00ff00c3 | Sig enab: 0x00ff00c3
[   72.736808] sdhci: AC12 err: 0x00000000 | Slot int: 0x00000000
[   72.736817] sdhci: Caps:     0x176ec8b0 | Caps_1:   0x03002177
[   72.736826] sdhci: Cmd:      0x0000341a | Max curr: 0x00000000
[   72.736832] sdhci: Host ctl2: 0x00000000
[   72.736840] sdhci: ADMA Err: 0x00000000 | ADMA Ptr: 0x00000000
[   72.736844] sdhci: ===========================================
[   82.750653] mmc0: Timeout waiting for hardware interrupt.
[   82.750664] sdhci: =========== REGISTER DUMP (mmc0)===========
[   82.750712] sdhci: Sys addr: 0x00000000 | Version:  0x00001502
[   82.750721] sdhci: Blk size: 0x00000000 | Blk cnt:  0x00000000
[   82.750730] sdhci: Argument: 0x80000c08 | Trn mode: 0x00000000
[   82.750738] sdhci: Present:  0x1eff0001 | Host ctl: 0x00000005
[   82.750747] sdhci: Power:    0x0000000f | Blk gap:  0x00000000
[   82.750756] sdhci: Wake-up:  0x00000000 | Clock:    0x0000fa07
[   82.750764] sdhci: Timeout:  0x00000000 | Int stat: 0x00000000
[   82.750773] sdhci: Int enab: 0x00ff00c3 | Sig enab: 0x00ff00c3
[   82.750781] sdhci: AC12 err: 0x00000000 | Slot int: 0x00000000
[   82.750790] sdhci: Caps:     0x176ec8b0 | Caps_1:   0x03002177
[   82.750799] sdhci: Cmd:      0x0000341a | Max curr: 0x00000000
[   82.750805] sdhci: Host ctl2: 0x00000000
[   82.750813] sdhci: ADMA Err: 0x00000000 | ADMA Ptr: 0x00000000
[   82.750817] sdhci: ===========================================
...
[   xx.xxxxxxx] mmc0: Timeout waiting for hardware interrupt.
...

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

Title:
  14e4:16bc Built-in SD card reader on Acer Aspire One AS756
  intermittently operative

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