[SOLVED] xfce compositor: Transparency graphic artifacts

According to one XFCE forum moderator, this issue is caused by a buggy blanking mode called 'glx' which is used by default. Setting it to 'xpresent' or 'off' causes the compositor to work properly again. This is magic. Just set the vblank setting to xpresent via: xfconf-query -c xfwm4 -p /gener…