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PS flickering on external monitor

Explorer ,
Jan 16, 2021 Jan 16, 2021

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Hello, I use a MBP 16" with i7 6 core processor, AMD Radeon Pro 5300M 4 GB and 16 GB of RAM. All my SW is up to date. I also use a Benq GW2480-B coonected over a cable by iVanky, USB C to HDMI, model LANVADA-C31. None of all other apps I used give this issue: Luminar 4, C1 express, Aurora HDR 2018, BR o LrC. I did not try with Gimp or Affinity Photo.

I tryed to connect the Mac to my TV, with the same cable, same issue. I doubt it is a the cable since the problem is relate only to the picture, not to the interface.

Here is a link to a video that is showing the problem: youtu.be/we_uBvQSlTk

I restore Mac OS completely: ko. I cleaned tro clean everythyng with cc cleaner tool and reinstall all again: ko. The Adobe support suggested to disable the GPU use in PS, but this is a problem for me since I need the liquify filter.
Any idea?

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Bug, Mac, Problem or error

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Explorer ,
Jan 16, 2021 Jan 16, 2021

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I tried to change the external monitor settings in Mac OS as well, both color profile and frequency: KO

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Advisor ,
Jan 16, 2021 Jan 16, 2021

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I would be very suspicious of the cable or the port on the MBP or monitor. Have you tried all of the USB-C ports? Same problem? I would try another cable before anything else. I'm using an old Dell external monitor with my MBP 16" through and adapter dongle. No problems like your.

Kenneth Seals

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Explorer ,
Jan 17, 2021 Jan 17, 2021

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Hello, I did not try with another cable though I did try to change the port to the second one on the same side of the Mac: KO.

I doubted it was a cable problem since I thought if it was it should hit al programs and also PS interface, whereas it hits only the picture side and it's even intermittent.

I am ready to buy another cable and try it out though, can you suggest anything? Thank you 

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Explorer ,
Jan 19, 2021 Jan 19, 2021

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Hi, I tried to reduce the resolution of the screen to 720p and it stops flickering, but it's pretty uncocofortable to work like this. I now bought a USB-C to Display port by Belkin, it's quite expensive but I can give it back on Amazon if it doesn't solve the issue. We'll see.

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Advisor ,
Jan 19, 2021 Jan 19, 2021

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I use that DP adapter on my MBP 16" for the connection to my 24" external Dell monitor and it works just fine.

Kenneth Seals

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Explorer ,
Jan 19, 2021 Jan 19, 2021

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Which adapter exactly?

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Advisor ,
Jan 19, 2021 Jan 19, 2021

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I'm not sure... I can't check it right now.

Kenneth Seals

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Explorer ,
Jan 27, 2021 Jan 27, 2021

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I solved the issue by changing the cable, now it stopped flickering. I move to a Belik cable, no more USB-C to HDMI but USB-C to Display Port. It's more expensive, but worth it.
Not, an issue is still left. Whenever I start postproducing an imagine I do it with LrC. No problems there. As soon as I ask the program to continue modify the picture in PS, the same picture in PS looks terribly differing (saturation up). If I open the liquify too, it looks normal. If I open Luminar 4 as PS plug-in it looks normal. I need to chek how it looks with Camera Raw but, in any case, in PS with the new cable coming from LrC. Any idea?

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Advisor ,
Jan 27, 2021 Jan 27, 2021

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Glad you got the flickering taken care of. That was one of my first suggestions.

Start a new topic on the forum about the color issues. No one is going to see this under it's current title.

Kenneth Seals

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