I’ve seen this with my 2410U on hdmi. It had to do with the colour being send being in ~~cymk~~ YPbPr instead of rgb which makes the display think it is acting

I’ve seen this with my 2410U on hdmi. It had to do with the colour being send being in ~~cymk~~ YPbPr instead of rgb which makes the display think it is acting as a TV and applies some smart stuff. This is fixable with a monitor profile but I do not have link ready. Edit: found the link: https://discussions.apple.com/thread/250732856 https://discussions.apple.com/thread/250732856