Cannot create a custom resolution

[ktsi]

Hi.

I have a MacBook Pro with M1 Max and an external monitor with 3440 by 1440 resolution (Mi Monitor ultra wide 34").

I want to use the PbP (picture by picture) mode of the monitor so that i can use two sources simultaneously - the Mac and a windows laptop.

The problem is that both sources need to be 1720 by 1440.

The win11 laptop already supports this resolution whereas the Mac does not.

Therefore I tried to create a custom resolution of 1720 by 1440 but BetterDisplay won't let me.

Any ideas?

Thanks a lot in advance.

[waydabber]

Creating a scaled resolution won't be useful here, you need a physical mode switch.

Does the EDID serve the 1720x1440? You can check this by entering this:

/Applications/BetterDisplay.app/Contents/MacOS/BetterDisplay get -n=mi -connectionModeListAll

And check if 1720x1440 is present in the list in any form or shape. If the display does not have mi in it, then substitute that for something the display name has.

[ktsi]

Hi again. Thanks for getting back.

This is what I get:

/Applications/BetterDisplay.app/Contents/MacOS/BetterDisplay get -n=mi -connectionModeListAll
3014737754189204848 - 3440x1440 180.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1627629068959092080 - 3440x1440 180.00Hz Fixed 8bit SDR RGB Full SRGB
2672464182509047152 - 3440x1440 180.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
2600406588471119216 - 3440x1440 180.00Hz Fixed 10bit SDR YCbCr 4:2:2 Limited SRGB
2564377791452155248 - 3440x1440 180.00Hz Fixed 8bit SDR YCbCr 4:2:2 Limited SRGB
3010515613456012288 - 5120x2880 60.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1641421326735381504 - 5120x2880 60.00Hz Fixed 8bit SDR RGB Full SRGB
2686256440285336576 - 5120x2880 60.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3014209972501745008 - 3440x1440 165.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1627101287271632240 - 3440x1440 165.00Hz Fixed 8bit SDR RGB Full SRGB
2671936400821587312 - 3440x1440 165.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
2599878806783659376 - 3440x1440 165.00Hz Fixed 10bit SDR YCbCr 4:2:2 Limited SRGB
2563850009764695408 - 3440x1440 165.00Hz Fixed 8bit SDR YCbCr 4:2:2 Limited SRGB
3013471100687879536 - 3440x1440 144.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1662391212476730736 - 3440x1440 144.00Hz Fixed 10bit SDR RGB Full SRGB
1626362415457766768 - 3440x1440 144.00Hz Fixed 8bit SDR RGB Full SRGB
2671197529007721840 - 3440x1440 144.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
2599139934969793904 - 3440x1440 144.00Hz Fixed 10bit SDR YCbCr 4:2:2 Limited SRGB
2563111137950829936 - 3440x1440 144.00Hz Fixed 8bit SDR YCbCr 4:2:2 Limited SRGB
3010515613444215808 - 5120x2160 60.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1677450123742548992 - 5120x2160 60.00Hz Fixed 10bit SDR RGB Full SRGB
2794342831330432000 - 5120x2160 60.00Hz Fixed 8bit SDR RGB Limited SRGB
1641421326723585024 - 5120x2160 60.00Hz Fixed 8bit SDR RGB Full SRGB
2686256440273540096 - 5120x2160 60.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3012626675757747568 - 3440x1440 120.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1661546787546598768 - 3440x1440 120.00Hz Fixed 10bit SDR RGB Full SRGB
1625517990527634800 - 3440x1440 120.00Hz Fixed 8bit SDR RGB Full SRGB
2670353104077589872 - 3440x1440 120.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3010515613444214784 - 4096x2160 60.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1677450123742547968 - 4096x2160 60.00Hz Fixed 10bit SDR RGB Full SRGB
2794342831330430976 - 4096x2160 60.00Hz Fixed 8bit SDR RGB Limited SRGB
1641421326723584000 - 4096x2160 60.00Hz Fixed 8bit SDR RGB Full SRGB
2686256440273539072 - 4096x2160 60.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3010515613444214528 - 3840x2160 60.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1677450123742547712 - 3840x2160 60.00Hz Fixed 10bit SDR RGB Full SRGB
2794342831330430720 - 3840x2160 60.00Hz Fixed 8bit SDR RGB Limited SRGB
1641421326723583744 - 3840x2160 60.00Hz Fixed 8bit SDR RGB Full SRGB
2686256440273538816 - 3840x2160 60.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3011922988315970928 - 3440x1440 100.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1660843100104822128 - 3440x1440 100.00Hz Fixed 10bit SDR RGB Full SRGB
1624814303085858160 - 3440x1440 100.00Hz Fixed 8bit SDR RGB Full SRGB
2669649416635813232 - 3440x1440 100.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
2597591822597885296 - 3440x1440 100.00Hz Fixed 10bit SDR YCbCr 4:2:2 Limited SRGB
2561563025578921328 - 3440x1440 100.00Hz Fixed 8bit SDR YCbCr 4:2:2 Limited SRGB
3010515573703970160 - 3440x1440 60.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659435685492821360 - 3440x1440 60.00Hz Fixed 10bit SDR RGB Full SRGB
1623406888473857392 - 3440x1440 60.00Hz Fixed 8bit SDR RGB Full SRGB
2668242002023812464 - 3440x1440 60.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
2596184407985884528 - 3440x1440 60.00Hz Fixed 10bit SDR YCbCr 4:2:2 Limited SRGB
2560155610966920560 - 3440x1440 60.00Hz Fixed 8bit SDR YCbCr 4:2:2 Limited SRGB
3012626675751847808 - 1920x1080 120.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1661546787540699008 - 1920x1080 120.00Hz Fixed 10bit SDR RGB Full SRGB
2778439495128582016 - 1920x1080 120.00Hz Fixed 8bit SDR RGB Limited SRGB
1625517990521735040 - 1920x1080 120.00Hz Fixed 8bit SDR RGB Full SRGB
2670353104071690112 - 1920x1080 120.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
2598295510033762176 - 1920x1080 120.00Hz Fixed 10bit SDR YCbCr 4:2:2 Limited SRGB
2562266713014798208 - 1920x1080 120.00Hz Fixed 8bit SDR YCbCr 4:2:2 Limited SRGB
3010163769711529328 - 3440x1440 50.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659083881500380528 - 3440x1440 50.00Hz Fixed 10bit SDR RGB Full SRGB
1623055084481416560 - 3440x1440 50.00Hz Fixed 8bit SDR RGB Full SRGB
2667890198031371632 - 3440x1440 50.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3012622458093963136 - 1920x1080 119.88Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1661542569882814336 - 1920x1080 119.88Hz Fixed 10bit SDR RGB Full SRGB
2778435277470697344 - 1920x1080 119.88Hz Fixed 8bit SDR RGB Limited SRGB
1625513772863850368 - 1920x1080 119.88Hz Fixed 8bit SDR RGB Full SRGB
2670348886413805440 - 1920x1080 119.88Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
2598291292375877504 - 1920x1080 119.88Hz Fixed 10bit SDR YCbCr 4:2:2 Limited SRGB
2562262495356913536 - 1920x1080 119.88Hz Fixed 8bit SDR YCbCr 4:2:2 Limited SRGB
3010515613435038208 - 2560x1600 60.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1677450123733371392 - 2560x1600 60.00Hz Fixed 10bit SDR RGB Full SRGB
1641421326714407424 - 2560x1600 60.00Hz Fixed 8bit SDR RGB Full SRGB
2686256440264362496 - 2560x1600 60.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3010515613432416768 - 2560x1440 60.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1677450123730749952 - 2560x1440 60.00Hz Fixed 10bit SDR RGB Full SRGB
1641421326711785984 - 2560x1440 60.00Hz Fixed 8bit SDR RGB Full SRGB
2686256440261741056 - 2560x1440 60.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3010515613433989120 - 2048x1536 60.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1677450123732322304 - 2048x1536 60.00Hz Fixed 10bit SDR RGB Full SRGB
1641421326713358336 - 2048x1536 60.00Hz Fixed 8bit SDR RGB Full SRGB
2686256440263313408 - 2048x1536 60.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3010515613428483968 - 1920x1200 60.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659435725217335168 - 1920x1200 60.00Hz Fixed 10bit SDR RGB Full SRGB
1623406928198371200 - 1920x1200 60.00Hz Fixed 8bit SDR RGB Full SRGB
2668242041748326272 - 1920x1200 60.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3010515613426517888 - 1920x1080 60.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659435725215369088 - 1920x1080 60.00Hz Fixed 10bit SDR RGB Full SRGB
2776328432803252096 - 1920x1080 60.00Hz Fixed 8bit SDR RGB Limited SRGB
1623406928196405120 - 1920x1080 60.00Hz Fixed 8bit SDR RGB Full SRGB
2668242041746360192 - 1920x1080 60.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3010513504597575552 - 1920x1080 59.94Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659433616386426752 - 1920x1080 59.94Hz Fixed 10bit SDR RGB Full SRGB
2776326323974309760 - 1920x1080 59.94Hz Fixed 8bit SDR RGB Limited SRGB
1623404819367462784 - 1920x1080 59.94Hz Fixed 8bit SDR RGB Full SRGB
2668239932917417856 - 1920x1080 59.94Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3010515613428483648 - 1600x1200 60.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659435725217334848 - 1600x1200 60.00Hz Fixed 10bit SDR RGB Full SRGB
1623406928198370880 - 1600x1200 60.00Hz Fixed 8bit SDR RGB Full SRGB
2668242041748325952 - 1600x1200 60.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3010515613426026128 - 1680x1050 60.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659435725214877328 - 1680x1050 60.00Hz Fixed 10bit SDR RGB Full SRGB
1623406928195913360 - 1680x1050 60.00Hz Fixed 8bit SDR RGB Full SRGB
2668242041745868432 - 1680x1050 60.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3010163769705629568 - 1920x1080 50.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659083881494480768 - 1920x1080 50.00Hz Fixed 10bit SDR RGB Full SRGB
2775976589082363776 - 1920x1080 50.00Hz Fixed 8bit SDR RGB Limited SRGB
1623055084475516800 - 1920x1080 50.00Hz Fixed 8bit SDR RGB Full SRGB
2667890198025471872 - 1920x1080 50.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3011043379006932224 - 1280x1024 75.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659963490795783424 - 1280x1024 75.00Hz Fixed 10bit SDR RGB Full SRGB
1623934693776819456 - 1280x1024 75.00Hz Fixed 8bit SDR RGB Full SRGB
2668769807326774528 - 1280x1024 75.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3010515613426025848 - 1400x1050 60.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1677450123724359032 - 1400x1050 60.00Hz Fixed 10bit SDR RGB Full SRGB
1641421326705395064 - 1400x1050 60.00Hz Fixed 8bit SDR RGB Full SRGB
2686256440255350136 - 1400x1050 60.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3010515613423568448 - 1600x900 60.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659435725212419648 - 1600x900 60.00Hz Fixed 10bit SDR RGB Full SRGB
1623406928193455680 - 1600x900 60.00Hz Fixed 8bit SDR RGB Full SRGB
2668242041743410752 - 1600x900 60.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3010515613425599744 - 1280x1024 60.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659435725214450944 - 1280x1024 60.00Hz Fixed 10bit SDR RGB Full SRGB
1623406928195486976 - 1280x1024 60.00Hz Fixed 8bit SDR RGB Full SRGB
2668242041745442048 - 1280x1024 60.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3010515613423568288 - 1440x900 60.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659435725212419488 - 1440x900 60.00Hz Fixed 10bit SDR RGB Full SRGB
1623406928193455520 - 1440x900 60.00Hz Fixed 8bit SDR RGB Full SRGB
2668242041743410592 - 1440x900 60.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3010515613421929728 - 1280x800 60.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659435725210780928 - 1280x800 60.00Hz Fixed 10bit SDR RGB Full SRGB
1623406928191816960 - 1280x800 60.00Hz Fixed 8bit SDR RGB Full SRGB
2668242041741772032 - 1280x800 60.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3011043379002737664 - 1024x768 75.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659963490791588864 - 1024x768 75.00Hz Fixed 10bit SDR RGB Full SRGB
1623934693772624896 - 1024x768 75.00Hz Fixed 8bit SDR RGB Full SRGB
2668769807322579968 - 1024x768 75.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3010515613421405440 - 1280x768 60.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1677450123719738624 - 1280x768 60.00Hz Fixed 10bit SDR RGB Full SRGB
1641421326700774656 - 1280x768 60.00Hz Fixed 8bit SDR RGB Full SRGB
2686256440250729728 - 1280x768 60.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3010515613420619008 - 1280x720 60.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659435725209470208 - 1280x720 60.00Hz Fixed 10bit SDR RGB Full SRGB
2776328432797353216 - 1280x720 60.00Hz Fixed 8bit SDR RGB Limited SRGB
1623406928190506240 - 1280x720 60.00Hz Fixed 8bit SDR RGB Full SRGB
2668242041740461312 - 1280x720 60.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3010513504591676672 - 1280x720 59.94Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659433616380527872 - 1280x720 59.94Hz Fixed 10bit SDR RGB Full SRGB
2776326323968410880 - 1280x720 59.94Hz Fixed 8bit SDR RGB Limited SRGB
1623404819361563904 - 1280x720 59.94Hz Fixed 8bit SDR RGB Full SRGB
2668239932911518976 - 1280x720 59.94Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3010515613421405184 - 1024x768 60.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659435725210256384 - 1024x768 60.00Hz Fixed 10bit SDR RGB Full SRGB
1623406928191292416 - 1024x768 60.00Hz Fixed 8bit SDR RGB Full SRGB
2668242041741247488 - 1024x768 60.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3010163769699730688 - 1280x720 50.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659083881488581888 - 1280x720 50.00Hz Fixed 10bit SDR RGB Full SRGB
2775976589076464896 - 1280x720 50.00Hz Fixed 8bit SDR RGB Limited SRGB
1623055084469617920 - 1280x720 50.00Hz Fixed 8bit SDR RGB Full SRGB
2667890198019572992 - 1280x720 50.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3011043378999984928 - 800x600 75.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659963490788836128 - 800x600 75.00Hz Fixed 10bit SDR RGB Full SRGB
1623934693769872160 - 800x600 75.00Hz Fixed 8bit SDR RGB Full SRGB
2668769807319827232 - 800x600 75.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3010937825883718432 - 800x600 72.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659857937672569632 - 800x600 72.00Hz Fixed 10bit SDR RGB Full SRGB
1623829140653605664 - 800x600 72.00Hz Fixed 8bit SDR RGB Full SRGB
2668664254203560736 - 800x600 72.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
2596606660165632800 - 800x600 72.00Hz Fixed 10bit SDR YCbCr 4:2:2 Limited SRGB
2560577863146668832 - 800x600 72.00Hz Fixed 8bit SDR YCbCr 4:2:2 Limited SRGB
3010515613418652448 - 800x600 60.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659435725207503648 - 800x600 60.00Hz Fixed 10bit SDR RGB Full SRGB
1623406928188539680 - 800x600 60.00Hz Fixed 8bit SDR RGB Full SRGB
2668242041738494752 - 800x600 60.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3011043378998018688 - 640x480 75.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659963490786869888 - 640x480 75.00Hz Fixed 10bit SDR RGB Full SRGB
1623934693767905920 - 640x480 75.00Hz Fixed 8bit SDR RGB Full SRGB
2668769807317860992 - 640x480 75.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
2596712213279933056 - 640x480 75.00Hz Fixed 10bit SDR YCbCr 4:2:2 Limited SRGB
2560683416260969088 - 640x480 75.00Hz Fixed 8bit SDR YCbCr 4:2:2 Limited SRGB
3010515613416686288 - 720x480 60.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659435725205537488 - 720x480 60.00Hz Fixed 10bit SDR RGB Full SRGB
2776328432793420496 - 720x480 60.00Hz Fixed 8bit SDR RGB Limited SRGB
1623406928186573520 - 720x480 60.00Hz Fixed 8bit SDR RGB Full SRGB
2668242041736528592 - 720x480 60.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3010163769697370832 - 720x576 50.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659083881486222032 - 720x576 50.00Hz Fixed 10bit SDR RGB Full SRGB
2775976589074105040 - 720x576 50.00Hz Fixed 8bit SDR RGB Limited SRGB
1623055084467258064 - 720x576 50.00Hz Fixed 8bit SDR RGB Full SRGB
2667890198017213136 - 720x576 50.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
2595832603979285200 - 720x576 50.00Hz Fixed 10bit SDR YCbCr 4:2:2 Limited SRGB
2559803806960321232 - 720x576 50.00Hz Fixed 8bit SDR YCbCr 4:2:2 Limited SRGB
3010513504587743952 - 720x480 59.94Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659433616376595152 - 720x480 59.94Hz Fixed 10bit SDR RGB Full SRGB
2776326323964478160 - 720x480 59.94Hz Fixed 8bit SDR RGB Limited SRGB
1623404819357631184 - 720x480 59.94Hz Fixed 8bit SDR RGB Full SRGB
2668239932907586256 - 720x480 59.94Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
3010515613416686208 - 640x480 60.00Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659435725205537408 - 640x480 60.00Hz Fixed 10bit SDR RGB Full SRGB
1623406928186573440 - 640x480 60.00Hz Fixed 8bit SDR RGB Full SRGB
2668242041736528512 - 640x480 60.00Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
2614198846208082560 - 640x480 60.00Hz Fixed 10bit SDR YCbCr 4:2:2 Limited SRGB
2578170049189118592 - 640x480 60.00Hz Fixed 8bit SDR YCbCr 4:2:2 Limited SRGB
3010513504587743872 - 640x480 59.94Hz Fixed 12bit HDR10 YCbCr 4:2:2 Limited SRGB
1659433616376595072 - 640x480 59.94Hz Fixed 10bit SDR RGB Full SRGB
1623404819357631104 - 640x480 59.94Hz Fixed 8bit SDR RGB Full SRGB
2668239932907586176 - 640x480 59.94Hz Fixed 8bit SDR YCbCr 4:4:4 Limited SRGB
2596182338869658240 - 640x480 59.94Hz Fixed 10bit SDR YCbCr 4:2:2 Limited SRGB
2560153541850694272 - 640x480 59.94Hz Fixed 8bit SDR YCbCr 4:2:2 Limited SRGB

So there is no 1720 by 1440 in this list.

[waydabber]

even when you are in PbP mode? If there is no 1720x1440 then it might be that the EDID does not contain that mode (but of course then Windows should not have it either) or macOS does not deem the mode feasible for some reason to provide an available physical timing mode. You can try altering the display's EDID so the mode is available and working. If it is available in the low level mode list, you can then force a mode switch to that mode with some tricks.

Changing scaled resolutions don't matter at all as that does not change the actual timing and the display won't recognize that as suitable for PbP.

If by any chance you are using the built-in HDMI, try DP instead as well.

[ktsi]

Well it wasn't in PbP mode before. When in PbP mode then I do see the 1720 by 1440 resolution in MacOS. Eventually, it works now. Mac is with DP and Win is with HDMI and it works!!

Thanks a lot!!!

[waydabber]

Nice! :) 🥳