jordan
Yes, the T480s running 1809 and not win 11 is similar to 1809 240Hz 7i. The T480s has supposedly crap AUO B140QAN02.3 panel I stated earlier, not the LG panel listed in the table which I don't have anymore to swap out and test.
My good news for the day: On the 7i using 1809 with BIOS set to dynamic and using intel graphics but with no intel driver installed using MS Basic Adapter at 64Hz refresh rate, I am seeing almost none of the typical slow alternating flicker which I thought was pixel inversion. The image under the scope is stable similar to using 1809 at 240 Hz but using discrete gpu. I cannot set screen refresh rate any higher than 64Hz with the basic MS driver. When I go back to 23H2 on the 7i and still using 60Hz panel refresh, I again see the slow alternating pattern of flicker even when I force 8 bit in discrete gpu in nvidia control panel or leave the bios set to dynamic and using iGPU.
This lead me to believe there is no extra dithering going on the software and gpu side and the output to the panel is 8 bit. With a 8 bit + FRC fake 10 bit panel as you found, this could be another safer alternative. Thanks again for suggesting 1809. Now I have to be careful not to break this setup. 🙂