As a workaround I found this GNOME extension:
https://extensions.gnome.org/extension/517/caffeine/
If you go into F11 fullscreen during playback, the screen no longer blanks. :-)
As a workaround I found this GNOME extension:
https:/ /extensions. gnome.org/ extension/ 517/caffeine/
If you go into F11 fullscreen during playback, the screen no longer blanks. :-)