I just tried messing with nvidiabl for my Thinkpad W510, without success. I've opened a bug report here:
https://github.com/guillaumezin/nvidiabl/issues/89 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/562005 Title: Backlight controls of laptops with NVIDIA NVS and Quadro FX 880M GPUs no longer function while using proprietary drivers To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-certification/+bug/562005/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs