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[Success] Radeon RX 6800 XT - Big Sur

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@byteminer,

Okay this is just pure evil, but we can try the following patch, which needs to be added to Kernel --> Patch section of config.plist:
XML:
        <key>Patch</key>
        <array>
            <dict>
                <key>Arch</key>
                <string>Any</string>
                <key>Base</key>
                <string></string>
                <key>Comment</key>
                <string>Change 0x73AB to 0x73AF</string>
                <key>Count</key>
                <integer>1</integer>
                <key>Enabled</key>
                <true/>
                <key>Find</key>
                <data>AAAAAItFrC2rcwAAD4QYAAAA</data>
                <key>Identifier</key>
                <string>com.apple.kext.AMDRadeonX6000HWServices</string>
                <key>Limit</key>
                <integer>0</integer>
                <key>Mask</key>
                <data></data>
                <key>MaxKernel</key>
                <string></string>
                <key>MinKernel</key>
                <string></string>
                <key>Replace</key>
                <data>AAAAAItFrC2vcwAAD4QYAAAA</data>
                <key>ReplaceMask</key>
                <data></data>
                <key>Skip</key>
                <integer>0</integer>
            </dict>
        </array>
View attachment 516347
  • It's best to copy and paste the XML block into config.plist
  • This patch should be used in combination with the attached kext
Thanks for being so active on this!
Unfortunately, yet again, no dice.
The GPU still appears with "No Kext Loaded".

In the meantime, I've managed to install Windows and the proper drivers so I'll be toying around with that over the coming days.

I've done some more research as well and it turns out that there's currently no tool capable of extracting the VBIOS from the XTXH variants. As far as I can tell, a tool exists, but is not publicly available thus far.
The only XTXH VBIOS I've seen in the wild has been a leaked one.

As such I think it'll take a few weeks until the right people get their hands on these new cards to properly develop, test and actually release these tools. Until then, there's little a layman like me can do, unfortunately.

I think the best medicine here may be time.
 
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Gigamaxx

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I managed to order following GPU and now i worry i'll run into the problem byte is having since it's one of the newer versions of card. these haven't been out long (this month). Lets hope it has a compatible device ID (or if it doesn't you find magic to make it work)

PowerColor Red Devil AMD Radeon RX 6900 XT Ultimate​

EDIT, it's definitely a variant
Navi 21 XTXH versus original Navi 21 XTX
whelp. Lets hope can find a way to make it work.
Looks like i'm joining your club @byteminer
73AF

 
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73AF

May the WEG guys find a way to make these work if nothing else.
 

CaseySJ

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Thanks for being so active on this!
Unfortunately, yet again, no dice.
The GPU still appears with "No Kext Loaded".

In the meantime, I've managed to install Windows and the proper drivers so I'll be toying around with that over the coming days.

I've done some more research as well and it turns out that there's currently no tool capable of extracting the VBIOS from the XTXH variants. As far as I can tell, a tool exists, but is not publicly available thus far.
The only XTXH VBIOS I've seen in the wild has been a leaked one.

As such I think it'll take a few weeks until the right people get their hands on these new cards to properly develop, test and actually release these tools. Until then, there's little a layman like me can do, unfortunately.

I think the best medicine here may be time.
Agreed. At least we've ruled out the straightforward remedies.
 

CaseySJ

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May the WEG guys find a way to make these work if nothing else.
Apple may officially add support for this and the 6700XT, which is NAVI 22 with device ID 0x73DF. I would expect the 6700XT to be supported, which means a future driver update may add more models.
 
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Confirmed working 11.4 with ASUS reference design 6900xt!

Edit: Before updating to 11.4 - all I did was download the latest kexts and replace them in my EFI. No bootflags were changed from my previous Big Sur boot with a 5700XT
 

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nothing special since support came with 11.4 beta 1
 
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Anyone confirmed is 6800 6800xt 6900xt support 4k 120hz or 144hz in latest beta Big Sur? (assume display support 4k 144hz)
 
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Anyone confirmed is 6800 6800xt 6900xt support 4k 120hz or 144hz in latest beta Big Sur? (assume display support 4k 144hz)

144hz confirmed working on my LG 27GL83A-B (1440p, not 4K) over DP with a 6800 XT. The monitor also claims adaptive sync is active but I'm not so sure about that actually being true.
 
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