Re: Mantle API enabled without research. How can I disable it ?

After a few hours I found my own answer.

In "C:\Users\<username>\Documents\BioWare\Dragon Age Inquisition\Save" is a file called ProfileOptions_profile . I found this because raptr had made a backup copy. Edit it with a text editor like notepad++ and change the line below from 1 to 0.

GstRender.MantleEnabled 1

Save and close the file, DAI launches again.