Just got a brand new Dell UltraSharp U4025QW and noticed something weird straight out of the box — the left half of the screen looks noticeably more saturated/vivid compared to the right half. It's a clean split right down the middle, almost like two different color profiles.
Setup:
- MacBook Air M4
- Connected via Thunderbolt (140W) using the included cable
- macOS sees it as a single display
What I've already tried (nothing worked):
- PIP/PBP Mode: Off
- Screen Partition (DP/TBT): Off
- Uniformity Compensation: On and Off
- Smart HDR: Desktop and Off
- Both Thunderbolt ports on the MacBook
- Color Preset: Standard, sRGB
- macOS Color Profile: Display P3 and sRGB
- Factory Reset
The weird part:
When I turn Screen Partition on (50/50 or 80/20), the color split completely disappears and the whole screen looks uniform. The moment I switch back to a single full-screen input, the split comes back. This makes me think it's not a hardware defect but something in how the monitor handles the Thunderbolt signal from Apple Silicon.
Has anyone experienced this with the U4025QW or any other Dell ultrawide + Apple Silicon combo? Any fix that worked for you?
Already contacted Dell support but figured someone here might have run into this before.