AnsweredAssumed Answered

CF791 Freesync black screen via DP

Question asked by vese on Sep 13, 2017
Latest reply on Feb 22, 2020 by yodamann



I received my new Samsung CF791 UW monitor this week but ran into some problems.

When using ultimate mode on freesync with the display connected via DP the screen goes black/display port loses signal with the DisplayPort icon at the top left corner of the monitor when I start some games, for example Hellblade: Senua's Sacrifice and PUBG (both Unreal 4 engine games) seem to do this everytime, while Witcher 3 works OK so far. Every now and then ALT-tabbing with the affected games I do get into the game and after that it seems to work until I restart the game/computer.


When I disable freesync or drop down to 2560x1080@100hz resolution it seems to work better and with limited testing there were no black screens.


When using HDMI cable the black screen/signal loss does not happen but freesync flickers at the lower end of the range.'


I've tested this issue with following drivers and it is present in all:






I am using the cable and power adapter that came with the monitor.

Computer Specs:

  • GPU: RX Vega 64
  • CPU+Mem: Ryzen 1700 + G.skill Flare X 3200mhz DDR4
  • MoBo: Asus Prime X370-Pro
  • PSU: Corsair RM750i


Could this be an issue with the VEGA 64 GPU or the recent drivers that reportedly fixed the freesync flicker for this monitor?