The display shows the following information:
AV1: RGBS 312p
Increasing V.Active has an effect up to 297 inclusive. Setting 298-300 does not change anything, so the 3 lines of the image are still lost. Lx4 mode on my monitor does not work.
To improve image clarity, I tried changing Sampling opt> Advanced timing tweaker> H.samplerate in increments of 1, but I couldn’t get such perfect clarity as in Lx5 1920×1080 mode.