1. I can confirm exactly same behaviour of your commands (on other OS). 2. I do not sure if this is a bug. 3. If you try to use some screen inversion along with brightness reduce, you may note that not only brightness becomes 'wrong', but the colored items are shown in wrong color. This is due to simple RGB-inversion, or Windows(R)-style inversion. Ubuntu after 12.04 LTS becomes far not friendly to correct screen shadowing/inversion/etc. because of most important tool of Compiz, the Color Filter, was thrown away at 14.04 LTS [1]. It was the reason why i am now on other OS (Slackware). Still, you may able to get what you want, with my workaround displayed in [1]. You will get correct colors. Hope that helps.
P.S. I am not sure if XFCE uses Compiz, but you ask about Ubuntu, not Xubuntu? [1] https://askubuntu.com/questions/538896/compiz-plugins-filter- ordering -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1654632 Title: xrandr negative brightness has wrong color space range To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/x11-xserver-utils/+bug/1654632/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
