I too have the same issue with a Brother DCP-L2540DW on Ubuntu 16.04.
$ dpkg -l |grep libsane
ii libsane:amd64 1.0.27+git20180209-xenial0
amd64 API library for scanners
ri libsane-common 1.0.27+git20180209-xenial0
amd64 API library for scanners -- documentation and support
files
ii libsane-hpaio:amd64 3.16.3+repack0-1
amd64 HP SANE backend for multi-function peripherals
Output from simple-scan -d
[+0.00s] DEBUG: simple-scan.vala:674: Starting Simple Scan 3.20.0, PID=19090
[+0.00s] DEBUG: Connecting to session manager
[+0.10s] DEBUG: ui.vala:2032: Loading state from
/home/mfoster/.cache/simple-scan/state
[+0.10s] DEBUG: ui.vala:1995: Restoring window to 684x996 pixels
[+0.10s] DEBUG: autosave-manager.vala:64: Loading autosave information
[+0.10s] DEBUG: autosave-manager.vala:259: Waiting to autosave...
[+0.10s] CRITICAL: gtk_event_controller_reset: assertion
'GTK_IS_EVENT_CONTROLLER (controller)' failed
[+0.15s] DEBUG: scanner.vala:1447: sane_init () -> SANE_STATUS_GOOD
[+0.15s] DEBUG: scanner.vala:1453: SANE version 1.0.27
[+0.15s] DEBUG: scanner.vala:1514: Requesting redetection of scan devices
[+0.15s] DEBUG: scanner.vala:803: Processing request
[+0.20s] DEBUG: autosave-manager.vala:281: Autosaving book information
[+0.30s] DEBUG: ui.vala:2124: Saving state to
/home/mfoster/.cache/simple-scan/state
[+3.30s] DEBUG: simple-scan.vala:404: Requesting scan at 150 dpi from device
'(null)'
[+3.30s] DEBUG: scanner.vala:1560: Scanner.scan ("(null)", dpi=150,
scan_mode=ScanMode.GRAY, depth=2, type=ScanType.ADF_BOTH, paper_width=2159,
paper_height=2794, brightness=0, contrast=0)
[+6.39s] DEBUG: scanner.vala:338: sane_get_devices () -> SANE_STATUS_GOOD
[+6.39s] DEBUG: scanner.vala:350: Device: name="brother4:bus3;dev1"
vendor="Brother" model="DCP-L2540DW" type="USB scanner"
[+6.39s] DEBUG: scanner.vala:803: Processing request
[+6.40s] DEBUG: scanner.vala:864: sane_open ("brother4:bus3;dev1") ->
SANE_STATUS_INVAL
[+6.40s] WARNING: scanner.vala:868: Unable to get open device: Invalid argument
[+6.77s] DEBUG: ui.vala:2124: Saving state to
/home/mfoster/.cache/simple-scan/state
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https://bugs.launchpad.net/bugs/1512027
Title:
open of device pixma:MX7600_... failed: invalid argument
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