I have a Brother MFC-7320 and I was getting this this afternoon:
$ scanimage -t
scanimage: open of device brother3:bus3;dev1 failed: Invalid argument
Using strace, I also saw the USBDEVFS_CONTROL error being reported up
the stack from the ioctl call.
What fixed this for me was adding my username to the group "lp". I also
Added to /lib/udev/rules.d/40-libsane.rules
MODE="0664", GROUP="lp"
So the final line looks like:
ATTRS{idVendor}=="04f9", MODE="0664", GROUP="lp",
ENV{libsane_matched}="yes"
Note, you may have to:
a) turn off the printer
b) sudo service udev restart
c) log out and log back in (for new group permissions to take effect)
d) turn printer on
Hope this helps.
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https://bugs.launchpad.net/bugs/478761
Title:
failed to start scanner: Invalid argument
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