Re: XPS 15 fan, on/off/on/off, gahhh!!!
** BEFORE TRY WITH INSTALLING AND UNINSTALLING DRIVERS AND OTHER STUFF**
Try this simplem fix that made my Dell XPS 15 fan to remain silent:
1. Go to Nvidia Control panel (right click on desktop or find it on try)
2. Go to "Adjust image settings with preview"
3. Select "Use my preference emphasising: Quality"
4. Click "Apply"
After this my fan directly stopped and remained in a low-speed state.