Changes from a few years ago that let users change their gamma settings for screens were apparently never merged, because "colord is the way to go." (https://bugzilla.xfce.org/show_bug.cgi?id=10069). However, I don't think so.
- To create diplay profiles a colorimeter is required
- People (for example me) want to make two monitors have somewhat similar colors by changing the gamma per channel and per monitor.
- Xorg.conf gamma settings are not respected by xfce, xfconf and display.xml doesn't provide means to change the gamma apparently. Settings applied using xrandr --gamma are discarded when games launch.
I made a somewhat longer description on this here: https://hip70890b.de/linux/xfce_gamma/#Pls
(It was said at https://xfce.org/community that this is also a place for ideas, so I hope this is fine. https://bugzilla.xfce.org/page.cgi?id=bug-writing.html doesn't mention guidelines for writing reports like this though. And I didn't quite know if answering to a years old thread is bad practice just like in regular forums so I created this new report.)
maybe storing something like additional xrandr command line args in xfconf to just cover all xrandr possibilities for good would be nice. there is also --brightness.
*** This bug has been marked as a duplicate of bug 10069 ***