Thanks. It looks like a Dell, but what model of Dell? Please try running this command and tell us what it returns:
sudo dmidecode -t1 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1893568 Title: Screen brightness missing Status in linux package in Ubuntu: Incomplete Bug description: gnome-control-center - power - Screen brightness is missing. also on top bar Screen brightness control appears but does nothing. the problem does not happen on same PC, different partition with Ubuntu 20.04 ProblemType: Bug DistroRelease: Ubuntu 20.10 Package: gnome-control-center 1:3.37.90-1ubuntu2 ProcVersionSignature: Ubuntu 5.4.0-42.46-generic 5.4.44 Uname: Linux 5.4.0-42-generic x86_64 ApportVersion: 2.20.11-0ubuntu45 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Sun Aug 30 19:47:23 2020 ExecutablePath: /usr/bin/gnome-control-center InstallationDate: Installed on 2020-08-28 (2 days ago) InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Alpha amd64 (20200826) SourcePackage: gnome-control-center UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1893568/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
