Confirmed. I guess this is because the slider is using Unicode symbols rather than real icons. In the battery menu, the symbols make sense because the text is white, so the solid sun is white. System Settings used to use a light-on-dark color scheme, but now uses a dark-on-light one, so the solid sun is black.
** Changed in: ubuntu-system-settings (Ubuntu) Status: New => Triaged -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1484269 Title: wrong symbols in brightness settings To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/ubuntu-system-settings/+bug/1484269/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs