A ray of hope for the alternative. After fixing a bug in the nvidiabl kernel module[1] I can use the standard OS brightness controls to control the backlight. More work needs to be done on that, and it needs to be brought into Ubuntu, but it is the proper solution and it does work for many devices.
[1] https://github.com/guillaumezin/nvidiabl -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1039916 Title: Nvidia driver causing SIGSEGV in nvclock and smartdimmer To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/nvclock/+bug/1039916/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs