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I encountered the same issue when installing Fedora 23 onto my Oryx Pro (I know Fedora isn't supported, etc.). I found a solution on the Archlinux wiki that talks about using inotify to watch for changes to the brightness file and run xbacklight to adjust the backlight levels. For my own sake, I documented it, but this might help for you on Ubuntu. It really sounds like a regression with the proprietary NVIDIA drivers. Maybe a similar file-monitoring could be incorporated into system76-daemon?
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