Yes, I think it is hardware specific. I think it mostly applies to laptops. I personally have an iMac, and its brightness can only be adjusted by software.
I attach the screenshot of the Screen Settings dialog. The Brightness slider is focused. ** Attachment added: "Screenshot of the Screen Settings dialog" https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/870805/+attachment/2538856/+files/Screenshot%20of%20the%20Screen%20Settings%20dialog.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/870805 Title: Screen dialog won't remember brightness setting To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/870805/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs