I edited the line: crt_range0 15625-15750, 49.50-65.00, 2.000, 4.700, 8.000, 0.064, 0.192, 1.024, 1, 1, 192, 288, 448, 576
Then generated video modes and installed. Unfortunately nothing has changed, no video signal and arcadeosd doesnt seem to switch resolutions anymore.
I will double check this once more to be sure.
BTW, I noticed that Im getting \\.\DISPLAY20 I dont know if that matters. Check out the screenshot below: