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How do I get this display to run at 1920x720 (native resolution)?

I purchased a 12.3" monitor to use as a secondary display for my Steam Deck. It is sold in multiple places under a few different brand names all claiming that its native resolution is 1920x720. I have also seen that this panel is used in BMW vehicles as the infotainment/dashboard display and the documentation for that use case also shows a 1920x720 native resolution. The problem is that I cannot get Windows, or Steam OS to run the display at that resolution. I'm guessing that Steam OS will be more of a challenge, (I could be wrong...). My research thus far has at best determined that the display controller PCB included in the monitor is somehow preventing the native resolution from being "offered" as an option to the OS of the computers I have connected it to. I have tried CRU (Custom Resolution Utility) and that hasn't worked, but I haven't gone so far as editing an INF file manually as that's a bit intimidating for now. The only resolutions that work are basically 16:9 and 4:3 aspect ratios such as 1080p or 800x600 but, at 1920x720, this display is much closer to a 21:9 aspect ratio which is one of the main reasons I selected it. I have only tried HDMI if that matters.
Can anyone help me get this thing to act right?

This is a stock photo of the display/monitor:

image.png.2b28448cdd91e43160a7f688b5db8d86.png
Links to the product pages on AliExpress (where I bought mine) and Amazon:
https://www.aliexpress.com/item/3256803925900560.html
https://www.amazon.com/VSDISPLAY-1920x720-VS123ZJ01A-12-3inch-Stretched/dp/B09STFLN9Z

The Amazon seller being EXTREMELY helpful when I tried to ask them about it 🙄:

image.thumb.png.64875a4447587586a9245a2f3a425748.png

And just for context, here's my admittedly ridiculous Steam Deck setup including the monitor in question:
image.thumb.png.5270e267883a56559cb4ce0c05a0c325.png

 

My System: "Ayanami" (from Neon Genesis Evangelion)

-SPECS-

CPU:
Intel Core i7-9700K
Motherboard:
ASUS ROG Strix Z370-I Gaming
RAM:
32GB (2x16GB) DDR4 3000MHz
GPU:
Gigabyte RTX 2080 WindForce
Case:
Phanteks Enthoo Evolv ITX TG
Storage:
OS: Western Digital 250GB WD Blue 3D NAND
STORAGE: CUK Cyclone 500GB PCIe M.2 NVMe + Samsung 860 EVO 1TB 2.5" SSD + OCZ Agility3 120GB 2.5" SSD + WD Blue 250GB 3.5" HDD + Hitachi GST Deskstar 3TB 3.5" HDD + WD easystore 8TB USB 3.0 ext. HDD
PSU:
CORSAIR HX 1050
Cooling:
Cooler Master Masterliquid Lite 240 AIO w/ Cooler Master MasterFan MF120 Halo White Edition Duo-Ring fans + stock 140mm rear exhaust and 200mm front intake Phanteks case fans
Operating System:
Windows 10 Pro x64
Displays:
Acer Nitro XV340CK 34" 3440x1440 IPS 144Hz + AOC AGON 24" AG241QG4 2560x1440 144Hz + HP ZR2440w 24" 1920x1200 IPS + Dell 2407WFP 24" 1920x1200
Keyboard:
ASUS ROG Strix Flare
Mouse:
Corsair M65 PRO RGB
Sound:
Corsair VOID RGB ELITE Wireless 7.1 + Harman/Kardon HK195 + Sony MHC-GX450
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That resolution makes for a 2.667 aspect ratio, which nothing supports AFAIK.

MODERATE TO SEVERE AUTISTIC, COMPLICATED WITH COVID FOG

 

Due to the above, I've likely revised posts <30 min old, and do not think as you do.

THINK BEFORE YOU REPLY!

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23 hours ago, An0maly_76 said:

That resolution makes for a 2.667 aspect ratio, which nothing supports AFAIK.

I doubt that aspect ratio is a deciding factor for compatibility. The EDID just tells the OS what to do and it does it. There seems to be support for the resolution in the Raspberry Pi world.

My System: "Ayanami" (from Neon Genesis Evangelion)

-SPECS-

CPU:
Intel Core i7-9700K
Motherboard:
ASUS ROG Strix Z370-I Gaming
RAM:
32GB (2x16GB) DDR4 3000MHz
GPU:
Gigabyte RTX 2080 WindForce
Case:
Phanteks Enthoo Evolv ITX TG
Storage:
OS: Western Digital 250GB WD Blue 3D NAND
STORAGE: CUK Cyclone 500GB PCIe M.2 NVMe + Samsung 860 EVO 1TB 2.5" SSD + OCZ Agility3 120GB 2.5" SSD + WD Blue 250GB 3.5" HDD + Hitachi GST Deskstar 3TB 3.5" HDD + WD easystore 8TB USB 3.0 ext. HDD
PSU:
CORSAIR HX 1050
Cooling:
Cooler Master Masterliquid Lite 240 AIO w/ Cooler Master MasterFan MF120 Halo White Edition Duo-Ring fans + stock 140mm rear exhaust and 200mm front intake Phanteks case fans
Operating System:
Windows 10 Pro x64
Displays:
Acer Nitro XV340CK 34" 3440x1440 IPS 144Hz + AOC AGON 24" AG241QG4 2560x1440 144Hz + HP ZR2440w 24" 1920x1200 IPS + Dell 2407WFP 24" 1920x1200
Keyboard:
ASUS ROG Strix Flare
Mouse:
Corsair M65 PRO RGB
Sound:
Corsair VOID RGB ELITE Wireless 7.1 + Harman/Kardon HK195 + Sony MHC-GX450
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Bumping for more potential help...

My System: "Ayanami" (from Neon Genesis Evangelion)

-SPECS-

CPU:
Intel Core i7-9700K
Motherboard:
ASUS ROG Strix Z370-I Gaming
RAM:
32GB (2x16GB) DDR4 3000MHz
GPU:
Gigabyte RTX 2080 WindForce
Case:
Phanteks Enthoo Evolv ITX TG
Storage:
OS: Western Digital 250GB WD Blue 3D NAND
STORAGE: CUK Cyclone 500GB PCIe M.2 NVMe + Samsung 860 EVO 1TB 2.5" SSD + OCZ Agility3 120GB 2.5" SSD + WD Blue 250GB 3.5" HDD + Hitachi GST Deskstar 3TB 3.5" HDD + WD easystore 8TB USB 3.0 ext. HDD
PSU:
CORSAIR HX 1050
Cooling:
Cooler Master Masterliquid Lite 240 AIO w/ Cooler Master MasterFan MF120 Halo White Edition Duo-Ring fans + stock 140mm rear exhaust and 200mm front intake Phanteks case fans
Operating System:
Windows 10 Pro x64
Displays:
Acer Nitro XV340CK 34" 3440x1440 IPS 144Hz + AOC AGON 24" AG241QG4 2560x1440 144Hz + HP ZR2440w 24" 1920x1200 IPS + Dell 2407WFP 24" 1920x1200
Keyboard:
ASUS ROG Strix Flare
Mouse:
Corsair M65 PRO RGB
Sound:
Corsair VOID RGB ELITE Wireless 7.1 + Harman/Kardon HK195 + Sony MHC-GX450
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