Nvidia breaks brightness controls. Editing xorg.conf, installing pommed and changing grub doesn't help

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http://askubuntu.com – Hardware: 13" MacBook Pro 5,5 (Summer 2009), GeForce 9400M. OS: Ubuntu 12.04.2 AMD64 My hardware and OS are similar to what some others with this problem had, but what worked for them doesn't work for me. Unfortunately, with the nvidia driver, the brightness controls (F1 and F2) do not work - no feedback at all. Changing /sys/class/leds/smc::kbd_backlight/brightness works, but doesn't change the actual brightness. I spent 5 hours on this issue and tried every suggestion from other threads and Wikis, but to no avail. Am I doing something wrong or missing something simple? lspci -v | grep - (HowTos)