Comment 16 for bug 1440891
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0e1f616
(Get the code!)
This bug is also a problem for Wayland. The proper fix is to export a new property (backlight) attached to the DRM connector object and let the userspace deal with this. Once this lands, modesetting could be accessing it.
Now, if older distros require modesetting to work, we would need to port the workaround found in the intel ddx, but it really is a workaround and I would rather avoid adding this code in X, so it could live as an external patch.