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 Desktop Packages, which is subscribed to x11-xserver-utils in Ubuntu. https://bugs.launchpad.net/bugs/1654632 Title: xrandr negative brightness has wrong color space range Status in x11-xserver-utils package in Ubuntu: New Bug description: 1) $ lsb_release -rd Description: Ubuntu 16.04.1 LTS Release: 16.04 2)$ apt-cache policy x11-xserver-utils x11-xserver-utils: Installed: 7.7+7 Candidate: 7.7+7 Version table: *** 7.7+7 500 500 http://archive.ubuntu.com/ubuntu xenial/main amd64 Packages 100 /var/lib/dpkg/status 3) With `xrandr --output VGA-0 --brightness -0.5` The B/W range should be #000 to around #777, like with: `xrandr --output VGA-0 --brightness 0.5` 4) In stead, I get: The B/W range is #777 to around #FFF. The white that should be after inversion black is is 50% gray. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: x11-xserver-utils 7.7+7 ProcVersionSignature: Ubuntu 4.4.0-57.78-generic 4.4.35 Uname: Linux 4.4.0-57-generic x86_64 NonfreeKernelModules: nvidia_uvm nvidia ApportVersion: 2.20.1-0ubuntu2.4 Architecture: amd64 CurrentDesktop: XFCE Date: Fri Jan 6 18:07:28 2017 InstallationDate: Installed on 2016-07-09 (181 days ago) InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1) SourcePackage: x11-xserver-utils UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/x11-xserver-utils/+bug/1654632/+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
