Fullscreen window unredirect broken
Gnome 3.30.2 and X11. Full screen applications default to BLIT (instead of FLIP) and with latest Nvidia Proprietary driver (418.43) GSYNC doesn't work (because it requires FLIP). This is on Fedora 29. With LXDE instead of gnome, FLIP and GSYNC works fine on the same PC.
Ubuntu and Arch have some patches that allow unredirecting. So it works in these distros. In Fedora it doesn't work (where gnome is not patched in any way that should affect this; very close to upstream).
Patched packages in AUR (not sure which patches are the relevant ones): https://aur.archlinux.org/packages/gnome-shell-performance/ https://aur.archlinux.org/packages/mutter-781835-workaround/ Reportedly using these patched packages from AUR makes GSYNC work.