I have found a workaround that kind of works ... The problem is with the sane library, so it has to be downgraded. I restored /usr/lib/x86_64-linux-gnu/sane/libsane-genesys.so.1.0.27 from my previous Ubuntu 18.04 installation and linked it instead of the current version, and that's all, it works for me in Ubuntu 21.10.
# ls -l /usr/lib/x86_64-linux-gnu/sane/libsane-genesys.so.1 lrwxrwxrwx 1 root root 25 Dez 10 22:52 /usr/lib/x86_64-linux-gnu/sane/libsane-genesys.so.1 -> libsane-genesys.so.1.0.32 # cd /usr/lib/x86_64-linux-gnu/sane # ln -fs libsane-genesys.so.1.0.27 libsane-genesys.so.1 # ls -l libsane-genesys.so* lrwxrwxrwx 1 root root 25 Jan 4 16:56 libsane-genesys.so.1 -> libsane-genesys.so.1.0.27 You can try to download the libsane-genesys.so.1.0.27 from here https://ubuntu.pkgs.org/18.04/ubuntu-main- amd64/libsane1_1.0.27-1~experimental3ubuntu2_amd64.deb.html -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to simple-scan in Ubuntu. https://bugs.launchpad.net/bugs/1888238 Title: Ubuntu 20.04 simple-scan brightness and contrast controls have no effect Status in Simple Scan: Unknown Status in simple-scan package in Ubuntu: Incomplete Bug description: Ubuntu 20.04 simple-scan. The Brightness and Contrast controls have no effect. No matter how I position the sliders the scan image remains the same, ie, a dark background. It is as if the controls are not 'connected'. Ubuntu 20.04 is up to date. The scanner is a Cannon LiDE60. I have 19.10 in another partition. Simple-scan works as expected. Ditto for 18.04. Regards. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: simple-scan 3.36.0-0ubuntu1 ProcVersionSignature: Ubuntu 5.4.0-40.44-generic 5.4.44 Uname: Linux 5.4.0-40-generic x86_64 ApportVersion: 2.20.11-0ubuntu27.3 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Mon Jul 20 09:47:52 2020 InstallationDate: Installed on 2020-05-12 (68 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423) MachineType: Hewlett-Packard HP EliteBook 8570p ProcEnviron: PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-40-generic root=UUID=dc547d11-1deb-404b-988a-a88d4772e66d ro quiet splash vt.handoff=7 SimpleScanLog: SourcePackage: simple-scan UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 12/05/2012 dmi.bios.vendor: Hewlett-Packard dmi.bios.version: 68ICF Ver. F.32 dmi.board.name: 17A7 dmi.board.vendor: Hewlett-Packard dmi.board.version: KBC Version 42.32 dmi.chassis.asset.tag: 8022456 dmi.chassis.type: 10 dmi.chassis.vendor: Hewlett-Packard dmi.modalias: dmi:bvnHewlett-Packard:bvr68ICFVer.F.32:bd12/05/2012:svnHewlett-Packard:pnHPEliteBook8570p:pvrA1029D1102:rvnHewlett-Packard:rn17A7:rvrKBCVersion42.32:cvnHewlett-Packard:ct10:cvr: dmi.product.family: 103C_5336AN G=N L=BUS B=HP S=ELI dmi.product.name: HP EliteBook 8570p dmi.product.sku: D2C13UP#ABA dmi.product.version: A1029D1102 dmi.sys.vendor: Hewlett-Packard To manage notifications about this bug go to: https://bugs.launchpad.net/simple-scan/+bug/1888238/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
