Screen areas get blurry with Nvidia driver

Solution 1:

I have the identical setup referenced.

I had this blurring problem and traced it to enabling FXAA in Nvidia settings. Originally I enabled this feature out of curiosity and noticed no difference. I then forgot about it. Yesterday I applied available updates and suddenly this blurring problem presented. After much futile struggle, I recalled fiddling with the Nvidia settings and returned there. It says pretty plainly that enabling FXAA disables antialiasing, yet in my Kubuntu settings I had antialiasing enabled. For some reason just disabling FXAA did not restore expected behaviour -- I had to change the Application settings to Enhance, and then the blurring disappeared. It was then fine to go back to the default Application Settings.