If you experienced ugly stretched aspect ratio problems with some (old) game or app still forcing a 16:9 res on your 16:10 screen, you have to know that Intel Graphics Command Center will expose GLOBAL SCREEN SCALING options only if the screen mode is set to a non-16:10 resolution first!
So, the simple solution to see correct aspect ratio proportions when switching to non-16:10 resolutions in iGPU/Optimus mode (e.g. an old game forcibly switching from 2560x1600 16:10 to 2560x1440 16:9) is:
- while in (Advanced) Optimus iGPU mode, temporarily change Windows screen desktop resolution to f.e. 2560x1440, or another low-res non-native screen mode
- open Intel Graphics Command Center and go to Display > Scaling
- switch scaling mode to: "Maintain Aspect Ratio" (will keep proportions with max vertical scale) or “Center Image” (no scale. Small resolutions will cause a "postage stamp effect" centered on screen)
I hated when some old game supporting only 16:9 (1920x1080 or 2560x1440) opened an ugly vertically stretched 16:9 screen with oval circles etc. on my 2560x1600 16:10 display. This solved the problem, adding the "letterbox" mode (black bars top & bottom to keep correct porportions) to all those full screen/borderless games automatically, when in iGPU-only or Optimus mode (iGPU+dGPU).
Obviously NVidia Control Panel will govern instead screen resize proportions for non-16:10 res when in dGPU-only mode.
