mutter freezing the UI while playing videos under intel chipset hd630
complete freeze of the graphical interface while playing video. It is not happening under weston so -> mutter bug. there is no error message whatso ever. not a system freeze since the sound and hdd continue to work.
everything is explained there: https://ask.fedoraproject.org/en/question/124109/freeze-in-fedora-28-while-playing-videos/?comment=124456#post-id-124456