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My 32GB SD card (FAT32) does not have any problem mounting perfectly if my laptop (running Ubuntu 14.04) never goes into suspend (after I close its lid).

But once I re-open the lid, retyping my password to login and resume working as before, the SD card vanishes, as if nothing was ever mounted... Pulling it out then re-inserting it doen't resolve the problem. I have to power of my laptop completely before the card is recognized and mounted again.

I have Windows 8.1 running on the same laptop (Lenovo Y50-70, dual-boot) and it has no such problem whatsoever, so this is unlikely to be a hardware problem. This points towards more like a driver bug in Ubuntu 14.04.

Is this a known issue? If so, do you know of any way to workaround it? (short of the aforementioned power-off)

  • BTW, restarting to Windows 8.1, accessing the SD card from there (mounts perfectly!), then restarting to Ubuntu, doesn't solve the problem. So, unfortunately, this cannot be a workaround. The only workaround currently is to power off the laptop completely, then power on to Ubuntu. – Bill The Ape Jan 11 '15 at 6:17
  • I'm having the same problem on my Lenovo Yoga 3 Pro with Ubuntu 16.04. It would be great to have this fixed. – Christian Aug 9 '16 at 2:37

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