Using Mainline Kernel 4.19.0 or above, it works. So it's a bug in the Ubuntu 18.10 Kernel Version.
Maybe it's this 4.19 patch. https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=61c4fc1eaf736344904767d201b0d4f7a2ebaf79 -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-settings-daemon in Ubuntu. https://bugs.launchpad.net/bugs/1788021 Title: changing keyborad brightness doesn't work Status in gnome-settings-daemon package in Ubuntu: Confirmed Bug description: Checking 'journalctl' I get this error message: <date> <hostname> gsd-power[1924]: gsd_power_backlight_abs_to_percentage: assertion 'max > min' failed Running on an Asus UX490UA (7th-gen Intel CPU), and before upgrading to 18.10 everything worked fine ProblemType: Bug DistroRelease: Ubuntu 18.10 Package: gnome-settings-daemon 3.29.90.1-1~ubuntu1 ProcVersionSignature: Ubuntu 4.17.0-7.8-generic 4.17.12 Uname: Linux 4.17.0-7-generic x86_64 ApportVersion: 2.20.10-0ubuntu7 Architecture: amd64 CurrentDesktop: ubuntu:GNOME Date: Mon Aug 20 21:22:13 2018 InstallationDate: Installed on 2018-08-15 (5 days ago) InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426) SourcePackage: gnome-settings-daemon UpgradeStatus: Upgraded to cosmic on 2018-08-20 (0 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/1788021/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
