Comment 32 for bug 12637

I'm running Xubuntu Feisty on my AMD Turion 64 laptop with an Nvidia 6150 graphics card. I cannot use the Fn key for any purpose, including adjusting the brightness. somewhere on the net I found that one could do this by "echo {reqd br. level} > /proc/acpi/video/*/LCD/brightness". however i cannot save the file even in sudo mode.... gives an error like "file has changed... still want to save?" It doesn't save even if i answer 'yes'. Attaching the contents of the brightness file......... pl help.