Hi, I don't know where to report this, I hope here is OK.
The nvidia-settings program doesn't load the .nvidia-settings-rc file if the locale settings for the decimal separator is comma instead of period. It saves the file with period-decimal float values, and try to read it with comma decimal separators:
$ nvidia-settings -l
ERROR: Error parsing configuration file '/home/dithi/.nvidia-settings-rc' on line 36: '0/RedBrightness=-0.104294' (Trailing garbage).
I use kubuntu 6.10 with kernel 2.6.17 with this apt repository for nvidia drivers:
I think it doesn't happen with lastest restricted ubuntu drivers in the official repo, but I'm not sure.
As workaround I manually replaced the periods with commas.