I have a Dell P2715Q (Version A02, does not have HDMI2.0). The xbox recognizes the monitor can accept 4k, but the monitor gives a "current input timing is not supported by the monitor display" error. MST is disabled. I can drive 4k60 on my pc just fine through the DP input, so I'm not sure what to do
CAC-1331 (HDMI2.0 to DP1.2) not working with Xbox Series X
A02 means you can't enable HDMI 2.0:
https://www.dell.com/support/kbdoc/en-is/000126493/setting-up-the-p2415q-p2715q-monitors-with-hdmi-2-0-that-support-4k-x-2k-60hz
There's no way to select 30Hz on the Xbox? Did you try 1080p or 1440p?
Oh, I think you are trying to get 594 MHz (HDMI 2.0 timing) to a display that only supports 533.25 MHz (CVT-RB timing). Have you tried HDMI 2.0 timing over DisplayPort to the display from PC to see if the display supports 594 MHz?
HDMI 2.0 timing is like this:
[email protected] 135.000kHz 594.00MHz h(176 88 296 +) v(8 10 72 +)
(front porch, sync width, back porch, polarity)
CVT.RB timing is like this:
[email protected] 133.313kHz 533.25MHz h(48 32 80 +) v(3 5 54 -)
I don't know if there's a way to fix this if there's no way to make a custom timing in Xbox. A modern 4K display supporting more than 4K60 may be the best solution.
The first HDMI 2.0 to DisplayPort adapters had dip switches to choose different EDIDs. There was a firmware update created to support 533.25 MHz timing in one of the EDIDs but I didn't have a display that had a problem with 594 MHz to test. Read about those adapters at
/thread/hdmi-2-0-to-displayport-1-2-2/