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Very important that you point out that has eye effects. It sounds to me quiet mode, by prioritizing energy saving and less fan noise, modifies the graphics routines as well?
Previously, the performance modes is something I leave on balanced all the time. In quiet mode, I don't like the power button LED turning blue.
So now you prefer the dynamic bios setting over discrete? Unplugging does sets limits for performance and tells the gpu and cpu it will not have enough power to play with. Like setting quiet mode, not sure it has an impact on dithering that I have to look into. Unplugged, you will not have access to performance mode only balanced and quiet?
Do you have the latest BIOS updates? Perhaps, it would be good to check if you can rollback to older BIOS version in case some update causes undesired changes. Their should be a setting in BIOS to enable rollback called "BIOS Flash Back" or something similar for your model.
Similarly, my T480s is comfortable and running on and only has UHD graphics of an older generation (UHD Graphics 620 versus Intel UHD Graphics 770 for your Legion)