Screen Flickering in Bordless Mode - But only when game has focus

[Robbery525]

My Setup: I7-6700k + 16GB DDR4 2600 + RTX-2070 + MSI Mag27CQ (With Freesync ON and Gsync-Compatible turned ON in the nvidia control panel)
 + 2 additional monitors that are hooked into the iGPU.
Playing on maxed out settings. Vsync ON/OFF shows no change in symptoms.
Max Framerate in Warframe/nvidia control panel is set to 144hz (refresh rate for my monitor).
Video Resolution 1440p

What is odd is the 'Refresh Rate' shown on the the 'display' menu for warframe lists 143.99HZ, which I don't understand why. But my GPU is showing constant 143hz on the MSI-Afterburner OSD and on the warframe OSD.

Symptoms:

• Full Screen Mode - No flickering of textures
• Borderless Full Screen while Game has focus:
  • game has flickering issue where it is constantly dimming/brightening slightly, and all shadows have a wobble.
• Borderless Full Screen while alt-tabbed
  • game displays perfectly, same as full screen mode.

[sam686]

19 hours ago, Robbery525 said:

Full Screen Mode - No flickering of textures

Full screen: works fine, likely because it bypasses DWM/Aero.

Borderless: I can see excessive stuttering problem with AMD 2400g with Vega 11 graphics, windows 10.

Borderless alt+tab: Monitor stuck at 144Hz like if FreeSync isn't working.

Using multi-monitors? Multi-monitors with different refresh rates have a problem on their own. Complain to Microsoft for having this bug on their operating system. Video of windows 10 different refresh rates fails: https://www.youtube.com/watch?v=p10OMGDXolQ

Alt tab while in borderless turn off adaptive refresh rate, until returned back into game. Very obvious with monitor's OSD RefreshRateNum and while spectating a player (dead, no health). edit: I use Acer 144Hz XF270H B monitor

Edited February 25, 2019 by sam686