Yes, the forums' website is down. Here is the google cache [2]. The link [1] entitled "NVIDIA Quadro NVS 3100M on Lenovo Thinkpad T510: NVIDIA Backlight Control Causes Buzz" is the first result in the search for "t510 backlight" [3].
The issue has also made it to Canonical's launchpad [4]. The link [1] is mentioned in comment #27 [5].
The issue has also made it to Canonical's launchpad [4]. The link [1] is mentioned in comment #27 [5].
[2] http://webcache.googleusercontent.com/search?q=cache:4dJW3r_...
[3] http://www.google.com/search?q=t510+backlight
[4] Bug #562005: Backlight controls of laptops with NVIDIA NVS and Quadro FX 880M GPUs no longer function while using proprietary drivers https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-dr...
[5] https://bugs.launchpad.net/ubuntu/+source/nvidia-graphics-dr...