Windows borderless fullscreen behaves like exclusive fullscreen on refresh rates above 240Hz

[qqueasy]

Edit: Changing present method in NVIDIA settings to prefer layered on DXGI Swapchain gets rid of the flickering on focus change and behaves as expected.

On windows, borderless fullscreen behaves identically to exclusive fullscreen when monitor refresh rate is set above 240Hz (ie. changing window focus makes screen flash black). I was unable to reproduce on i3wm arch linux. This occurs with WindowBorderless = 1 and Fullscreen = 1. Changing refresh rate to 240Hz or below at any point fixes this issue until switching back to higher refresh rate.

Windows settings i have tried changing:

• Optimisations for windowed games
• Variable refresh rate
• Run this program in compatibility mode for Windows 8
• Disable full-screen optimisations

Nvidia specific settings:

• smooth motion off
• Low Latency Mode: off / on
• Monitor Technology: G-SYNC Compatible / Fixed Refresh
• Vertical Sync: 3D app setting / off

Relevant code seems to be in rts/Rendering/GlobalRendering.cpp

infolog.txt

[bruno-dasilva]

there is supposedly a workaround here: https://discord.com/channels/549281623154229250/1337170270556917842/1515895545388863560
please take a look

I have personally not dug deeper into this but the 240hz is an interesting aspect that I'm not sure has been reported before

[qqueasy]

there is supposedly a workaround here: https://discord.com/channels/549281623154229250/1337170270556917842/1515895545388863560 please take a look

Yes, globally changing present method to prefer layered on DXGI Swapchain gets rid of the flickering on focus change and behaves as expected. Very strange it only starts happening above 240Hz.

[bruno-dasilva]

yea very strange. As I understand it so far, this issue occurs in a bunch of opengl games. Definitely work digging more into since it seems to affect a fair few people.