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[gian <storti@xxxxxxxxxxxxxx>]

Same here (dell E6410, Ubuntu 10.04, kernel 2.6.32-24-generic, x86_64)
....
Aug  2 16:26:14 venera kernel: [    6.662519] mmc0: Unknown controller version (2). You may experience problems.
Aug  2 16:26:14 venera kernel: [    6.662592] sdhci-pci 0000:04:00.0: setting latency timer to 64
Aug  2 16:26:14 venera kernel: [    6.662640] Registered led device: mmc0::
Aug  2 16:26:14 venera kernel: [    6.662673] mmc0: SDHCI controller on PCI [0000:04:00.0] using ADMA
Aug  2 16:26:14 venera kernel: [    6.667146] Bluetooth: Core ver 2.15
....

and then
....
Aug  6 22:57:26 venera kernel: [   23.836810] mmc0: Unexpected interrupt 0x02000000.
Aug  6 22:57:26 venera kernel: [   23.836811] sdhci: ============== REGISTER DUMP ==============
Aug  6 22:57:26 venera kernel: [   23.836817] sdhci: Sys addr: 0x00000000 | Version:  0x00000402
Aug  6 22:57:26 venera kernel: [   23.836822] sdhci: Blk size: 0x00007008 | Blk cnt:  0x00000001
Aug  6 22:57:26 venera kernel: [   23.836828] sdhci: Argument: 0x00000000 | Trn mode: 0x00000013
Aug  6 22:57:26 venera kernel: [   23.836834] sdhci: Present:  0x01ff0202 | Host ctl: 0x00000011
Aug  6 22:57:26 venera kernel: [   23.836840] sdhci: Power:    0x0000000f | Blk gap:  0x00000000
Aug  6 22:57:26 venera kernel: [   23.836845] sdhci: Wake-up:  0x00000000 | Clock:    0x00004007
Aug  6 22:57:26 venera kernel: [   23.836851] sdhci: Timeout:  0x0000000a | Int stat: 0x02008000
Aug  6 22:57:26 venera kernel: [   23.836857] sdhci: Int enab: 0x02ff00cb | Sig enab: 0x02ff00cb
Aug  6 22:57:26 venera kernel: [   23.836863] sdhci: AC12 err: 0x00000000 | Slot int: 0x00000001
Aug  6 22:57:26 venera kernel: [   23.836869] sdhci: Caps:     0x21e832b2 | Max curr: 0x00000040
Aug  6 22:57:26 venera kernel: [   23.836875] sdhci: ADMA Err: 0x00000001 | ADMA Ptr: 0x200b654c
Aug  6 22:57:26 venera kernel: [   23.836876] sdhci: ===========================================
Aug  6 22:57:26 venera kernel: [   23.836884] mmc0: Unexpected interrupt 0x02000000.
Aug  6 22:57:26 venera kernel: [   23.836885] sdhci: ============== REGISTER DUMP ==============
.....
repeated a llot of times, until:
Aug  6 22:57:36 venera kernel: [   33.779940] mmc0: error -110 whilst initialising SD card

-- 
Ubuntu 10.04 64 bit on Dell Lattitude E6410: Failed to read MMC card
https://bugs.launchpad.net/bugs/605043
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