This means, when I install Fedora 25, Fedora seems to assume, the card has 1024 MB as it sees it is this Radeon card. But after installation right after first boot, the login display is scrambled and not usable. Well, I can switch to terminal, but I do not know what to do, so I can not get the card working properly. Therefore I have to use Fedora 24. But it has some problems, as it does not support the hybrid graphics card system fully, yet (several dead cursors on the screen …). As installer I am able to start the left “EFI” on boot screen. The right “EFI” boots with a scrambled display. So I am afraid installing it on the MBP, if after installation the desktop is scrambled again as in Fedora 25. And I need a properly working graphics card as I need it to develop in c++ a system with OpenGL.