I have the same keyboard backlight issue with my Dell Studio XPS 1640.
Gnome 3 is probably relevant. I have experienced exactly the same problem under Ubuntu, Linux Mint Cinnamon and Fedora.
I have the same keyboard backlight issue with my Dell Studio XPS 1640.
Gnome 3 is probably relevant. I have experienced exactly the same problem under Ubuntu, Linux Mint Cinnamon and Fedora.