Any fix yet? Mine is doing the same thing. I can't seem to enable freesync through DP, only HDMI, and still through HDMI it has issues as to where I get screen tears and crashes while gaming.
Great Monitor, one caveat
If you want to use the The AMD FreeSync mode, it has to be turned on in the monitor’s OSD (On Screen Display), described in the manual, (LG's OWNER’S MANUAL LED LCD MONITOR (LED Monitor*)) on page 10
Do You have an option in the monitor GUI to select DP version 1.2 as temporary workaround?
Check in General -> Display Port Version.