Turn off gaming mode permanently
Somebody needs to pay for this flickering annoying **bleep**, I mean legal action, Microsoft or Roku!
I have three Onn (Walmart brand) TV's, and unfortunately they all use the Roku platform.
I use a Fairly new powerful 17" Laptop with a fast AMD Radeon graphics chip, on Windows 11. I use an Onn QLED TV as the laptop's secondary monitor on native 4096 x 2160 resolution, note that is slightly higher than normal 4K which is 3840 x 2160.
I have gaming mode turned off in Windows settings.
I have the TV's HDMI mode set to "Auto", because turning it to compatibility disables HDR, and the therefore much better color range. Huge difference!
Problem is with any full screen source on my Laptop's secondary output, the Onn TV, PowerPoint, Game, browsing family pictures; When I move my mouse between and selecting display's, the Onn Roku TV is either flickering at least once, BUT not always with notification "Game mode turned on by console".
It is EXTREMELY annoying! And as another have previously pointed out to a Roku support member, who seems to have never following his own faulty advice, if the Windows operating system have already sent a signal to the TV, that game mode needs to be turned on, AND even though "Game Mode" in Windows is set to "Off", the Onn Roku TV's Picture Setting "Game Mode" is INACCESSIBLE, as in NOT AVAILABLE, as in "GREYED OUT"!!!
There is PLENTY of documentation to the problems and lack of solutions from Roku, just do a Google result, and it is quite evident that thousands of people are experiencing these inconvenient flickering, and/or "Game Mode" being turned on and off, at seemingly random! So Roku do not be surprised if you one of these day's receive one or more letter concerning legal action.
Now Roku can grab the ball, to come up with a solution, so "Game Mode" can be turned off at ANY time, even though the console or computer has requested it to be turned on!
Well I tried something else and it seems to work for me, might not be a solution for others.
Go to Settings > TV Inputs > Computer > HDMI mode
Mine was set to Auto (recommended). I changed this to Compatibility and it's not switching back and forth.
My use case is just using this as an external monitor for work. It's not actually being used for gaming.