The most simple test: open several video players (e.g. 10 players)
simultaneously and make them "full screen".
Most probably, you may get a similar "freezing".
If it is the case, the problem is the so-called "Xorg Input Hotplugging"
I have Arch (with Gnome and OSS4) installed on a very old computer (of
The problem was solved by creating the proper /etc/X11/xorg.conf (and also
No "freezing" anymore.