In my experience, you can just use Manual Mode. Don't worry, setting just the fan speed shouldn't be a problem at all, as long you dont change the GPU clock options.

Same, with my GU502GU. And this worries me, because I use the laptop mostly for work, and even if programs are demanding but not like a videogame, I have to jump to manual mode, otherwhise the laptop will reach 90+°. (also since last year I have to s...