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 Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1788021 Title: changing keyborad brightness doesn't work To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-settings-daemon/+bug/1788021/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
