Public bug reported:

Sane has not been working at all.
 Simple Scan, XSane, and other associated programs detect and offer installed 
scanners, choose one then screen greys out after a long wait.
Using Ubuntu 15.04
 check and update every day
This scanner has been functioning commanded by PC and by scanner panel buttons 
for many months but now hangs with a grey screen and red note "failed to scan 
Unable to connect to scanner"
 I have tried al sorts but mostly up against a brick wall for the last few 
weeks.
Printer operates properly.

This might help
david@david-Lenovo-H535:~$ simple-scan -d
[+0.00s] DEBUG: simple-scan.vala:594: Starting Simple Scan 3.16.1.1, PID=10884
[+0.00s] DEBUG: Connecting to session manager
[+0.04s] DEBUG: ui.vala:1880: Loading state from 
/home/david/.cache/simple-scan/state
[+0.04s] DEBUG: ui.vala:1848: Restoring window to 600x400 pixels
[+0.04s] DEBUG: autosave-manager.vala:64: Loading autosave information
[+0.04s] DEBUG: autosave-manager.vala:259: Waiting to autosave...
[+0.04s] CRITICAL: gtk_event_controller_reset: assertion 
'GTK_IS_EVENT_CONTROLLER (controller)' failed
[+0.23s] DEBUG: autosave-manager.vala:281: Autosaving book information
[+0.23s] DEBUG: ui.vala:1971: Saving state to 
/home/david/.cache/simple-scan/state
[+0.23s] DEBUG: scanner.vala:1446: sane_init () -> SANE_STATUS_GOOD
[+0.23s] DEBUG: scanner.vala:1452: SANE version 1.0.24
[+0.23s] DEBUG: scanner.vala:1513: Requesting redetection of scan devices
[+0.23s] DEBUG: scanner.vala:802: Processing request
[+0.39s] DEBUG: ui.vala:1971: Saving state to 
/home/david/.cache/simple-scan/state
[+11.32s] DEBUG: scanner.vala:338: sane_get_devices () -> SANE_STATUS_GOOD
[+11.32s] DEBUG: scanner.vala:350: Device: name="brother4:net1;dev2" 
vendor="Brother" model="*HaroParkScanner" type="k"
[+11.32s] DEBUG: scanner.vala:350: Device: name="brother4:net1;dev1" 
vendor="Brother" model="*DCP-7065DN" type="DCP7065DN"
[+11.32s] DEBUG: scanner.vala:350: Device: name="brother4:net1;dev0" 
vendor="Brother" model="*UpstairsScan" type="DCP7065DN"
Expected scanner function.
Simple scan window greyed out/hing had to force quit after 5 min.


Thanks

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: simple-scan 3.16.1.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.19.0-16.16-generic 3.19.3
Uname: Linux 3.19.0-16-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CurrentDesktop: Unity
Date: Tue May 19 16:45:01 2015
InstallationDate: Installed on 2015-01-29 (110 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
MachineType: LENOVO 10117
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-16-generic 
root=UUID=94709fac-8bfa-41bf-8d29-24abdd9f77cc ro quiet splash vt.handoff=7
SimpleScanLog:
 
SourcePackage: simple-scan
UpgradeStatus: Upgraded to vivid on 2015-05-16 (3 days ago)
dmi.bios.date: 11/05/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: I7KT31AUS
dmi.board.vendor: LENOVO
dmi.board.version: 31900058 STD
dmi.chassis.type: 3
dmi.chassis.vendor: LENOVO
dmi.modalias: 
dmi:bvnLENOVO:bvrI7KT31AUS:bd11/05/2013:svnLENOVO:pn10117:pvrLenovoH535:rvnLENOVO:rn:rvr31900058STD:cvnLENOVO:ct3:cvr:
dmi.product.name: 10117
dmi.product.version: Lenovo H535
dmi.sys.vendor: LENOVO

** Affects: simple-scan (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug vivid

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https://bugs.launchpad.net/bugs/1456834

Title:
  Simple Scan and Sane hang greyed out

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