Custom Resolution on Dell Monitors

[rbakerbotelho]

Hi,
I found what I believe to be a bug. Right now I'm able to use both monitors with the desired custom resolution.

My setup:

• MacBook Pro 13 TB 2019
• TB3 to 2xHDMI adapter
• Dell U2515H
• Dell U2518D

I was trying to use a custom resolution of 1920x1080 and HiDPI(my monitors specs are for 2560x1440).
Through RDM list, setting 1920x1080 was working, but no HiDPI. So I tried to set a custom resolution. It didn't work.
Tried creating other resolutions, but it wouldn't appear on the resolution list.

I disconnected one monitor at a time and, when plugged back in, RDM showed the new custom resolutions and the monitors were able to change. The steps I followed were:

1. Create custom resolution, adding all the Unknown flags
2. Save the new profile
3. Unplug screen no.1
4. Plug it back in
5. Go through the resolution list, find the custom one, set it to screen no.1
6. Unplug screen no.2
7. Plug it back in
8. Go through the resolution list, find the custom one, set it to screen no.2

Comment 1:Apparently, it seems that this rough "reset" of the screens are needed for RDM to show the new custom resolution and the monitors to accept it.

Comment 2: RDM listed the new custom resolution on the second screen before following steps from 5 till the end. However, it wouldn't accept the custom resolution. Only after disconnecting and reconnecting, it accepted.

Since I'm also running ddcctl from this, I'll try changing inputs and going back to macOS and post it here. It might help someone.

rcbb

[rbakerbotelho]

Ok, I have just tried changing inputs from my PC to my macOS using ddcctl and ddm.
The screen resolution was kept as it should, but RDM was closed.