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4k@144Hz no longer available after upgrade to Big Sur  

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joevt
(@joevt)
Noble Member
Joined: 4 years ago
 

@bo_gao, Why does this file look nothing like the first file you posted? What was the name of the original file you changed?

I see Big Sur 11.6 has an override for DisplayVendorID-6b3/DisplayProductID-3220 but your display has product ID 13025 = 32E1

Are you connecting with DisplayPort or HDMI?

It seems likely that this DisableDSC flag is not sufficient for enabling DSC. We might need a patch like discussed at https://github.com/kingo132/a51m-r2-5700m-hackintosh/blob/main/fix_navi10_4k_120hz.md except maybe we need to look at the applyDscPolicyToStream function which calls the dc_dsc_compute_config function. The problem could be outside the AMD driver though - in CoreDisplay framework. I guess first thing to do would be to use the "log show" command to see if it mentions testing DSC modes and to see what messages are output in case of failure.

 

 

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Bo Gao
(@bo_gao)
Active Member
Joined: 1 month ago
 
Posted by: @joevt

@bo_gao, Why does this file look nothing like the first file you posted? What was the name of the original file you changed?

The first file I post is located in /System/Library/Displays/Contents/Resources/Overrides/DisplayVendorID-6b3/

only 1 file called "DisplayProductID-3220", but I this is wrong file I changed.

Following your instructions again, after set max pixel clock I got a new file here: /Library/Displays/Contents/Resources/Overrides/DisplayVendorID-6b3/DisplayYearManufacture-2020-DisplayWeekManufacture-1
I add some config (dsc) to this file, and this is what I post in the previous post.

Posted by: @joevt

I see Big Sur 11.6 has an override for DisplayVendorID-6b3/DisplayProductID-3220 but your display has product ID 13025 = 32E1

SwitchResX show me

Vendor: AUS - 6B3

Product: 32E1

image

 

Posted by: @joevt

Are you connecting with DisplayPort or HDMI?

 

I use type-c to DisplayPort to connnet to my Display. I tried in BootCamp windows, it can reach 4k144hz10bit + HDR.

 

Posted by: @joevt

It seems likely that this DisableDSC flag is not sufficient for enabling DSC. We might need a patch like discussed at https://github.com/kingo132/a51m-r2-5700m-hackintosh/blob/main/fix_navi10_4k_120hz.md except maybe we need to look at the applyDscPolicyToStream function which calls the dc_dsc_compute_config function. The problem could be outside the AMD driver though - in CoreDisplay framework. I guess first thing to do would be to use the "log show" command to see if it mentions testing DSC modes and to see what messages are output in case of failure.

 

I have no idea how to do this. this means we can patch the macos?

To do: Create my signature with system and expected eGPU configuration information to give context to my posts. I have no builds.

.

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mac_editor
(@mac_editor)
Famed Member Moderator
Joined: 5 years ago
 
Posted by: @joevt

I guess first thing to do would be to use the "log show" command to see if it mentions testing DSC modes and to see what messages are output in case of failure.

We also know it works in Catalina so comparing logs/disassembly might be helpful. Some easy initial workarounds to try would be to just use Catalina driver in big sur and things like that (common technique to “front-port”).

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