Comment 11 for bug 131672

system76-driver deb package installed
driver recognizes system type and codename (Darter Ultra)
39 updates followed through Update Manager

After Restart, Fn+F5 and Fn+F6 still do not work

Parallel discussion on system76 forums (meanwhile, trying to find workaround)
http://system76.com/forums/viewtopic.php?p=7519#7519