Welcome to Linux Mint
Need More Info
I have this exact video card on my desktop, I have Linux Mint KDE_CE X64 . I do not have this issue.So before I go to far into posting answers for this.
May I first ask you what were the steps taken to cause this issue, Ex = Did you install a driver, enable & or change the settings in compuiz .
Have you tried the compatibility Mode @ the boot menu ?
Do the default settings work?
Many Questions. Please post & someone will get back to you, Have a Nice Day