[sane-devel] genesys:libusb:.... changes while scanning (sane)

[Richard Ryniker]

Summary: you have four USB scanners; plug them in, and SANE can access
any one of them successfully, but then cannot access any of the three
other scanners.

If you unplug one scanner, then plug it in again, can SANE then use that
scanner?  This action should re-create the device's data structures and
thereby clear any status left by earlier activity.  If the re-plugged
scanner works, this suggests SANE changes the state of the scanners it
did not use in some way that interferes with later use.