Created attachment 5026 Patch against xfce4-settings from git May 6 2013 The attached patch agains git version from May 6 2013 will add sliders for gamma correction and brightness to xfce4-display-settings. (I remember that in once in old days, xfce had allready settings for gamma correction) I would be pleased if you accept this patch or if you just write me how to modify it in such a way, that you would accept it. I've also attached a screenshot of the xfce4-display-settings dialog.
Created attachment 5027 Screenshot of xfce4-display-settings
Personally (but I'm not the guy maintaining this part of the settings), not relevant to include. If we want to have proper coloring support, colord is the way to go.
*** Bug 6512 has been marked as a duplicate of this bug. ***
As Nick pointed out, colord is the proper way to address this (even though it's a lot more complicated than your patch). The main problem I see is that it totally clutters the dialog and it's only useful in very rare cases.
For what it's worth, I've rebased your patch on top of master and integrated it in the display settings dialog in a way that isn't as visually intrusive as the original patch. You can check this branch for the working (but maybe not final) version: https://git.xfce.org/users/ochosi/xfce4-settings/?h=improve_display_dialog
*** Bug 16303 has been marked as a duplicate of this bug. ***
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