I am experiencing this issue also. Looking at the Xorg.0.log I am seeing the screen disconnect .
[ 71289.913] (--) NVIDIA(GPU-0): DFP-4: disconnected [ 71289.913] (--) NVIDIA(GPU-0): DFP-4: Internal DisplayPort [ 71289.913] (--) NVIDIA(GPU-0): DFP-4: 1440.0 MHz maximum pixel clock [ 71289.913] (--) NVIDIA(GPU-0): [ 71289.927] (--) NVIDIA(GPU-0): DFP-6: disconnected [ 71289.927] (--) NVIDIA(GPU-0): DFP-6: Internal DisplayPort [ 71289.927] (--) NVIDIA(GPU-0): DFP-6: 1440.0 MHz maximum pixel clock [ 71289.927] (--) NVIDIA(GPU-0): [ 71290.640] (--) NVIDIA(GPU-0): Acer KG281K (DFP-4): connected [ 71290.640] (--) NVIDIA(GPU-0): Acer KG281K (DFP-4): Internal DisplayPort [ 71290.640] (--) NVIDIA(GPU-0): Acer KG281K (DFP-4): 1440.0 MHz maximum pixel clock [ 71290.640] (--) NVIDIA(GPU-0): [ 71290.649] (--) NVIDIA(GPU-0): Acer KG281K (DFP-6): connected [ 71290.649] (--) NVIDIA(GPU-0): Acer KG281K (DFP-6): Internal DisplayPort [ 71290.649] (--) NVIDIA(GPU-0): Acer KG281K (DFP-6): 1440.0 MHz maximum pixel clock [ 71290.649] (--) NVIDIA(GPU-0): [ 71290.798] (II) NVIDIA(0): Setting mode "DP-4: nvidia-auto-select @3840x2160 +3840+0 {ViewPortIn=3840x2160, ViewPortOut=3840x2160+0+0}" [ 71290.937] (II) NVIDIA(0): Setting mode "NULL" [ 71291.089] (II) NVIDIA(0): Setting mode "DP-2: nvidia-auto-select @3840x2160 +0+0 {ViewPortIn=3840x2160, ViewPortOut=3840x2160+0+0}" [ 71291.141] (II) NVIDIA(0): Setting mode "DP-2: nvidia-auto-select @3840x2160 +0+0 {ViewPortIn=3840x2160, ViewPortOut=3840x2160+0+0}, DP-4: nvidia-auto-select @3840x2160 +3840+0 {ViewPortIn=3840x2160, ViewPortOut=3840x2160+0+0}"
I am experiencing this issue also. Looking at the Xorg.0.log I am seeing the screen disconnect .
[ 71289.913] (--) NVIDIA(GPU-0): DFP-4: disconnected 3840x2160, ViewPortOut= 3840x2160+ 0+0}" 3840x2160, ViewPortOut= 3840x2160+ 0+0}" 3840x2160, ViewPortOut= 3840x2160+ 0+0}, DP-4: nvidia-auto-select @3840x2160 +3840+0 {ViewPortIn= 3840x2160, ViewPortOut= 3840x2160+ 0+0}"
[ 71289.913] (--) NVIDIA(GPU-0): DFP-4: Internal DisplayPort
[ 71289.913] (--) NVIDIA(GPU-0): DFP-4: 1440.0 MHz maximum pixel clock
[ 71289.913] (--) NVIDIA(GPU-0):
[ 71289.927] (--) NVIDIA(GPU-0): DFP-6: disconnected
[ 71289.927] (--) NVIDIA(GPU-0): DFP-6: Internal DisplayPort
[ 71289.927] (--) NVIDIA(GPU-0): DFP-6: 1440.0 MHz maximum pixel clock
[ 71289.927] (--) NVIDIA(GPU-0):
[ 71290.640] (--) NVIDIA(GPU-0): Acer KG281K (DFP-4): connected
[ 71290.640] (--) NVIDIA(GPU-0): Acer KG281K (DFP-4): Internal DisplayPort
[ 71290.640] (--) NVIDIA(GPU-0): Acer KG281K (DFP-4): 1440.0 MHz maximum pixel clock
[ 71290.640] (--) NVIDIA(GPU-0):
[ 71290.649] (--) NVIDIA(GPU-0): Acer KG281K (DFP-6): connected
[ 71290.649] (--) NVIDIA(GPU-0): Acer KG281K (DFP-6): Internal DisplayPort
[ 71290.649] (--) NVIDIA(GPU-0): Acer KG281K (DFP-6): 1440.0 MHz maximum pixel clock
[ 71290.649] (--) NVIDIA(GPU-0):
[ 71290.798] (II) NVIDIA(0): Setting mode "DP-4: nvidia-auto-select @3840x2160 +3840+0 {ViewPortIn=
[ 71290.937] (II) NVIDIA(0): Setting mode "NULL"
[ 71291.089] (II) NVIDIA(0): Setting mode "DP-2: nvidia-auto-select @3840x2160 +0+0 {ViewPortIn=
[ 71291.141] (II) NVIDIA(0): Setting mode "DP-2: nvidia-auto-select @3840x2160 +0+0 {ViewPortIn=