RGB Output colour format missing from main monitor

Gareth2665

Gareth2665

Gareth2665

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27 Oct 2024
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United Kingdom
I am using 2 identical AOC Q27G3XM monitors on Windows 11 set up as dual monitors. Both using DP connection.

Monitor 1 is my main monitor with the taskbar etc.

I notced yesterday that in NVIDIA control panel under "Change Resolution" Monitor 1 only has the option of YCbCr422 and not RGB.

If i tab onto Monitor 2 it has the choice of RGB, YCbCr422 and YCbCr444

Both monitor settings are exactly the same and also the same in windows settings.

I have no clue why?
 
both at the same res, refresh rate and same brand DP cables?

Maybe the res and max hz of your monitor is to much bandwidth to turn on RGB? but they only works if they are set to different refresh rates, and I don't know what the DP limitations are. I know with HDMI cables it was a thing.
are they both enabled as G-Sync ? in nvidia control panel.
 
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Yes, both are G-Sync enabled exactly the same. But not same brand DP cables. Monitor 1 actually has the better cable as monitor 2 has the cable that came with the monitor and Monitor 1
a better one i purchased to replace the damage original.
 
try swapping monitor 1 and 2 cables around and see if it switches the RGB to the other monitor.
maybe the cable wasnt actually better
 
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Well, I unplugged the DP and plugged it into a different DP port. My screen just flashed red, white then back and forth with no desktop. I had a short panick, plugged it back into the original slot. My desktop returned (Phew) and low and behold RGB is now an option for both monitors!!!! Fathom that one out...lol
 
Further confusion, i stated above i thought it was fixed. Upon turning my PC on the following day it reverted back to YCbr422. If i remove the cable from the PC and replace it I can again select RGB but only until my PC is restarted. So i assumed it was a faulty cable and ordered a new one only to face the same problem this morning?
 
who are you buying cables from?

Club 3d are the best, a Dutch brand of video cards and digital multimedia products such as TV tuner cards and digital sound cards for PCs, featuring AMD graphics chipsets and technologies.

most the no brand VESA certified ones are lying if you check

theres a database you can search https://www.displayport.org/product-category/cables-adaptors/

like Ivanky claim they are VESA certified on Amazon but their cables aren't listed.

Maybe it's just a multi monitor bug though.
 
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