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This was a bug in gnome-shell https://gitlab.gnome.org/GNOME/gnome-shell/issues/799

Downgrading gnome-shell and mutter to 3.30.1 makes it work.

But there is a another bug now. Sometimes starting a game with gsync on causes a black screen. Or the screen is first visible, but as soon as touching keyboard or mouse, the output turns off and screen goes black. When turning gsync off it works again. I've managed to get it working again after rebooting. This problem is with both LXDE and Gnome, so it looks more like an nvidia issue, or possibly X11.

This was a bug in gnome-shell https://gitlab.gnome.org/GNOME/gnome-shell/issues/799

Downgrading gnome-shell and mutter to 3.30.1 makes it work.

But there is a another bug now. FLIP is now enabled in full screen, so that is not the problem anymore. Sometimes starting a game with gsync Gsync on causes a black screen. Or the screen is first visible, but as soon as touching keyboard or mouse, the actual graphics output (Displayport output) turns off and on and screen goes black. black (as long as game is full screen and in focus). When Alt-tab-ing out of the game display turns back on. And when turning gsync Gsync off it works again. I've managed to get it working again after rebooting. This problem is with both LXDE and Gnome, so it looks more like an nvidia issue, or possibly X11.X11. I can get it working again by fiddling with nvidia driver settings, by setting Force Composition Pipeline on and off. Then suddenly Gsync works again.

This was a bug in gnome-shell https://gitlab.gnome.org/GNOME/gnome-shell/issues/799

Downgrading gnome-shell and mutter to 3.30.1 makes it work.

But there is a another bug now. FLIP is now enabled Edit. It will be fixed in full screen, so that is not the problem anymore. Sometimes starting a game with Gsync on causes a black screen. Or the screen is first visible, but as soon as touching keyboard or mouse, the actual graphics output (Displayport output) turns off and on and screen goes black (as long as game is full screen and in focus). When Alt-tab-ing out of the game display turns back on. And when turning Gsync off it works again. This problem is with both LXDE and Gnome, so it looks more like an nvidia issue, or possibly X11. I can get it working again by fiddling with nvidia driver settings, by setting Force Composition Pipeline on and off. Then suddenly Gsync works again.upcoming Gnome 3.32 release (Fedora 30).

This was a bug in gnome-shell https://gitlab.gnome.org/GNOME/gnome-shell/issues/799

Downgrading gnome-shell and mutter to 3.30.1 makes it work.

Edit. It will also be fixed in upcoming Gnome 3.32 release (Fedora 30).