- May 31, 2016
- Gigabyte Z490 Vision G
- RX 5700 XT
- Classic Mac
- Mobile Phone
1. What I see when you hold option key and click scaled?
well, when I go 'System Preferences' under 'Display' and hold option key I see bottom right 'Detect Displays' and a bit more different resolution option, but Maximal is 1080p
View attachment 488606
2. I'm not connected via HDMI, I connect from mainboard via (TB3 USB-C) to Monitor DP (cable USB 3.1 to DP) - it is NO adapter - it's just direct cable. Other (TB3 USB-C) slot I connect to Apollo UAD.
3. Why does it say forced RGB mode (EDID override), because of this:
The Dell P4317Q monitor displays the full spectrum of colours correctly when it receives the input signal from the OS as an RGB signal. The default colour display profile for this monitor on Mac OS is configured to transmit a YPbPr signal to the Dell P4317Q, thus rendering the black #000000 colour to be visibly displayed as dark grey. In the YPbPr mode all of the colours are displayed completely incorrectly and in unbalanced proportions
In order fix this problem and to achieve correct colour display functionality, a forced RGB mode color profile has to be implemented for the Dell P4317Q (and a number of other models of monitors that are not supported by Mac OS by default)
PS.: /update: Just installed Big Sur DP7 update and now I see a bit more resolution so I get 2560x1440 @ 60Hz, but 4k is not there
Are you sure it’s a USB3.1 to DisplayPort cable? If so that could bit a source of the problem.