1. Updated to latest Game Ready driver for Nvidia RTX 3080 (could only install one of them, “Game Ready” or “Studio” driver, not both).
2. Only main monitor is HDR capable. Turning HDR to ON fixes the problem, but the main monitor becomes unusable — color calibration doesn’t work in HDR mode.
Please note, turning off “Flipped Display” also fixes the problem when HDR is OFF. Something is inefficient and backward about the flip code, e.g. a pixel of 0x10101111 is flipped to 0x11110101 when it should remain the same while the pixel position is flipped with respect to the screen.