MP 7,1 1 x XDR 2x LG 5K really full res? with AGDCDiagnose and DisplayDiagnose

[OliZ]

Hi,

now I have my setup complete. MP with Vega II, XDR and 2 x LG 5K. All looks great but is it really in full res?

I took both diag and who likes to read and have an opinion ?



Regards
Oli

 

[SecuritySteve]

You go to apple menu -> about this mac, and there is a Displays tab with the information. You can see the current resolution in the Display system preferences. Your AGDC / DisplayDiagnose information seem to only be reporting for one monitor, which has a 4k resolution somewhere. Good luck.

 

[OliZ]

Hmm, in the dialog I can see them all.

 

[OliZ]

And here from the system report:

 

[theluggage]

And here from the system report:

Can't answer your question, but just a caveat: I've found the "System Report" info on 'native' resolutions to be inaccurate and/or inconsistent between display types.

E.g. system report on my iMac is currently saying:

---
iMac:
Display Type: Built-In Retina LCD
Resolution: 5120x2880 Retina
(no 'looks like' resolution is shown)
----
DELL S2817Q:
Resolution: 5120x2880 (5K/UHD+ - Ultra High Definition Plus)
UI Looks like: 2560 x 1440 @ 60 Hz
----

...while reality is that the internal display is in "looks like 2880x1620" whereas the Dell is only a 4k display and its own OSD display confirms its a 3140x2160 "4k" signal.

The internal 5k is always reported as 5k regardless of scaling, while for the third-party display the 'Resolution' is the virtual resolution used in the scaling process (i.e. 2x the 'looks like' resolution). Moral: if the system report appears to contradict reality, reality has probably got it right!

 

[mattspace]

And here from the system report:
View attachment 894931

Interesting the 59Hz reporting - I was concerned that was something unique to my Benq displays, or the RX580

 

[DearthnVader]

On a side note, a graphics card with as much VRam as I have in for system Ram.

I'm green with envy.

 

[joevt]

You go to apple menu -> about this mac, and there is a Displays tab with the information. You can see the current resolution in the Display system preferences. Your AGDC / DisplayDiagnose information seem to only be reporting for one monitor, which has a 4k resolution somewhere. Good luck.

macOS doesn't show what resolution is being sent to the displays. You need to use an app like SwitchResX or a tool like AGDCDiagnose.

Use SwitchResX to view timing info of the current resolution. For a tiled display like these, the timing info shown by SwitchResX is for a hypothetical single tiled display representing the dual tiled display (the pixel clock is approximately double the actual pixel clocks used by the two tiles). The timing info comes from the overlay EDID in the mtdd file in the display overrides folder and is only for show but it is at least an indication that dual tile mode is working.

The 3840x2160 that you see in the EFIDisplayInfo section of AGDCDiagnose is probably the resolution used during startup (during EFI time) because the EFI graphics drivers probably don't know how to handle dual tile displays.

To find the timings used by the displays, scroll down to the parts that say "Timing DICT 21".
"Display Mode 80005000" is used for the first (left) tile of the display.
"Display Mode a00" is used for the second (right) tile of the display - ignore these (or at least notice that they contain similar info to the first tile).

You can see that two displays are 5120x2880 (two tiles of 2560x2880 running at 483.25 MHz) and one display is 6016x3384 (two tiles of 648.91296 MHz).