switchresx and Mac Silicon

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Level 1

8 points

switchresx and Mac Silicon

Has anyone had success supporting 5120 x 1440 external monitor resolution with Big Sur and late 2020 Macs with M1 chips ? My Samsung CRG9 49 inch monitor worked perfectly with SwitchResX under previous system on late 2013 Macbook Pro running El Capitan, but I updated it to Big Sur and migrated data to a new Macbook Air M1 and have had no luck setting SwitchResX up... it doesn't behave the same at all... indeed it detects a different vendor and device code and thinks that it's talking to a 12 inch monitor. Setting up timings as per previous settings just gets an invalid flag... Seriously annoying.

Anyone managed to make these devices play nicely with each other ? I'll be hugely disappointed if I can't use my sweet monitor with my new macbook... might have to revert my previous laptop to el capitan and persist without the 'upgraded OS'.

MacBook Air 13″, macOS 10.15

Posted on Nov 27, 2020 8:23 PM

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Answer 1

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cowerb4me Author

Level 1

8 points

Nov 29, 2020 1:29 AM in response to Paul Conaway

Other threads indicated that Display Port v 1.2 was the way to go, so final solution was an ALOGIC USB-C->DisplayPort adaptor, an ALOGIC DisplayPort->DisplayPort Ultra 8K Cable (2.0 metres) and setting the version of Display Port to Display Port v1.2 through the Samsung CRG9 menu system... plus employing the SwitchResX software. Sourced the items for approx $38 AUD (adaptor) and $34 AUD (cable) through JB-HiFi if that helps anyone else... Cheers.

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Answer 2

cowerb4me Author

Level 1

8 points

Nov 27, 2020 10:16 PM in response to cowerb4me

So it seems that I had to remove and reinsert my USB-C -> HDMI cable a few times to have it detect the correct vendor / product code and talk to it... I now have correct resolution, but incorrect pixel color format... my white appears green at moment and most things are shades of purple. Battle continues, but there's hope:

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Answer 3

Nov 27, 2020 8:52 PM in response to cowerb4me

Cower, check this SwitchResX FAQ. They say there are some issues.

I hope this helps.

Paul

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Answer 4

Nov 28, 2020 6:15 AM in response to cowerb4me

Cool, at least you are making progress. Sort of on a side note. I've noticed other Big Sur postings about USB dongles and aren't working without power. I don't expect yours to have a USB C port and need power. This leads me to believe that Big Sur made some changes with how it deals with USB/Thunderbolt connectivity.

Paul

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Answer 5

cowerb4me Author

Level 1

8 points

Nov 27, 2020 9:35 PM in response to Paul Conaway

odd... the macbook pro late 2013 was employing the apple supplied NVidia driver and still managed to push pixels in the appropriate fashion. What's really confusing me is how it extracts different vendor and model data now... oh wait... I pulled up a photo of the settings pre update on my old macbook and was going to compare those to what was coming through now, and it's managed to update itself... it now sees the SAM - 4C2D vendor code and Product F99. I'm awash in blue and red pixels just now, but hopefully changing my color profile will feed it green in appropriate measure and I'll be back to sweet laptop and sweet monitor happy days...

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switchresx and Mac Silicon

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