Selecting a scan resolution the scanner doesn't support gives vague error message

[Csipak Attila]

Binary package hint: simple-scan

Scanner model: HP ScanJet 3670
Ubuntu-release: 10.04 LTS

simple-scan autodetects the following resolutions for the above scanner model: 75, 150, 300, 600, 1200, 2400 dpi. All except the last (2400 dpi) are correct.

Furthermore, if I try to scan using the inappropriate 2400 dpi resolution, a dialog box is shown (rough English translation "Couldn't start scanning."). After closing that, the problem stays permanent: even if I select valid resolutions, the same dialog box keeps appearing upon start scan. A full reboot cures the situation (and maybe there's some less dramatic method to reset the original functionality, but I didn't find it yet).

I also tried scanning with xsane, which detected only the valid resolutions, all else being equal.

ProblemType: Bug
DistroRelease: Ubuntu 10.04
Package: simple-scan 1.0.3-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.32-27.49-generic-pae 2.6.32.26+drm33.12
Uname: Linux 2.6.32-27-generic-pae i686
Architecture: i386
CheckboxSubmission: e2d5c7bfc37fda48b3b6654086b36cd0
CheckboxSystem: edda5d4f616ca792bf437989cb597002
Date: Mon Jan 17 00:02:24 2011
DriverPackageVersions:
 libsane 1.0.22~git20101229-0ubuntu1~lucid1
 libsane-extras N/A
 hplip N/A
 hpoj N/A
InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
ProcCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.32-27-generic-pae root=UUID=33a8cb8e-2586-4bf1-a90f-7edaf6aa5b01 ro quiet splash
ProcEnviron:
 LANG=hu_HU.UTF-8
 SHELL=/bin/bash
SourcePackage: simple-scan
dmi.bios.date: 12/13/2005
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 080009
dmi.board.name: P4P800SE
dmi.board.vendor: ASUSTeK Computer Inc.
dmi.board.version: Rev 2.xx
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr080009:bd12/13/2005:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASUSTeKComputerInc.:rnP4P800SE:rvrRev2.xx:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.

[Csipak Attila (corphicks)]

Appears to be fixed in:

Ubuntu 12.04 LTS
simple-scan 3.4.1

Scanning with resolution set to 2400 dpi now result in using de facto 1200 dpi.

As to why, see the related question: #141578 - answer #3 describes the resolution control in detail and also gives an explanation of the behaviour in simple-scan 3.4.1.