Here's a somewhat interesting account from what seems to me like a duplicate. I think I can confirm what he says about values in /proc/acpi/video/VID/LCD0/brightness
Bug #613638 Adjusting brightness broken after hibernate/suspend -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to nvidia-graphics-drivers in 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 _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
