https://bugzilla.kernel.org/show_bug.cgi?id=71461
--- Comment #15 from Tom Yan tom.ty89@gmail.com --- (In reply to Tom Yan from comment #14)
The problem with DisplayPort seems to related to DPMS. All I need to do to get back the display is to make sure that there is a state change after the monitor is turned on again.
Just find that this part is a duplicate of this: https://bugs.freedesktop.org/show_bug.cgi?id=46711