The 'failed to start scanner: invalid argument' error message seems
rather non-specific, and by association I think this bug discussion
overall  seems rather non-specific.  I can intermittently replicate this
error message by plugging my Fujitsu ScanSnap S500 into an over-loaded
USB hub.  lsusb still shows it, but scanimage -L gives the "no scanners
were identified" error, and of course xsane gives the "failed to start
scanner: invalid argument" error.  Unplugging the scanner and plugging
it into a different USB port fixes the issue.

I think what the original poster described seems like a hardware-
specific issue, and maybe this should be separated out into one bug per
scanner model, or at least better described in the bug title.

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https://bugs.launchpad.net/bugs/478761

Title:
  failed to start scanner: Invalid argument

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