@Etienne: rescanning also doesn't actually solve the problem: remove the
SD card and rescan and the device disappears again! It's only when
rescanning (or booting) with a card inserted and then not rescanning
that it stays.

I guess the only solution would be to rescan the bus any time the system
polls for mounts… (do they still poll? I guess more than once per second
would affect performance… I don't know anything about PCI, does polling
wake up devices etc? Would it be bad for battery life to poll too
often?)

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https://bugs.launchpad.net/bugs/703180

Title:
  SD card reader doesn't work on new Dell XPS

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