macOS 12.3 Update Causes Problems for 5700/6800/6900 Graphics Cards

[Superbogey]

Tested my RX 5500XT (4GB) in NeatBench and it confirms how slow, jumpy and laggy my system has become after the update.

 

[tedyun]

Tested my RX 5500XT (4GB) in NeatBench and it confirms how slow, jumpy and laggy my system has become after the update.

What is your monitor, and can you adjust the refresh rate to variable?

 

[nottooshabby]

Anyone know if graphics performance suffers with RX 580 cards?

 

[trs96]

Anyone know if graphics performance suffers with RX 580 cards?

Most report that it actually improves with 12.3. I have a 570 but haven't tried it with 12.3 yet.

 

[MysticalOS]

I've passed as much information on as i could about both VRR solutions for some and SSDT to others to someone else who can pass it on directly to apple driver engineers. This will hopefully result in at least some competence to figuring out what they changed that broke everything...The fact it's affecting mac pros, egpu, and press is picking up issue should hopefully light some fire under issue and not get it dismissed as just some one off hackintosh issue...we're clearly collateral but not the only sufferers, which gives much better hope of resolution.

 

[athei]

Anyone figured out a fix SSDT for RX6900XT?

 

[Superbogey]

What is your monitor, and can you adjust the refresh rate to variable?

I have 2 4K monitors - LG LU28R55 & Acer CB281HK. Both were originally set to 60 Hz and worked just fine up until this update. Have changed both to "Variable 40 - 60 Hz" per another post and it's now less smooth but at least tolerable now.

 

[MysticalOS]

Looking at what this SSDT is doing, I feel like it's just injecting missing properties that driver should be filling in. I'm wondering if @vit9696 could come up with something cleaner in whatever green after determining what 12.3 is expecting to be there, that isn't.

I did several tests and either got no improvements, or a kernel panic at startup trying to push anything from that 5700XT file into my 6900XT card, even accounting for the BRG0 for the spoof. The values probably too far off that it just destabilized card radically, so stuck waiting on a fix from apple, in mean time I'm also working on getting a 12.2.1 fresh installer and necessary backups to roll back if I get impatient.

 

[athei]

Thanks for your research @MysticalOS . I think I will roll back from a time machine backup for now.

 

[buddyjack2]

Luckily, I read about the AMD card problems here on tonymac before trying the update to Monterey 12.3, so I decided to test it first, by partitioning a small part of an internal SATA hard drive and installing Monterey (12.0.1) onto it. Once booted from that partition, Geekbench reported Metal/OpenCL of 158xxx/105xxx... nearly what I get when booting Monterey from my usual SSD. My OpenCore 0.7.9 specifies support of iGPU for VDA decoding/acceleration. All seemed good.

Updating that partitition's Monterey to 12.3 afterwards was an entirely different matter. The update installed okay but the system froze at Mac's login screen, the moment I started typing my user password. I rebooted, and that time I did make it past the login screen step and actually reached the Finder/desktop, but the system crashed shortly after the notification "Optimizing Your Mac..." appeared. Subsequent attempted reboots do more or less succeed for a few moments, but now produce a warning about "Hash Mismatch" and a recommendation to reinstall Monterey. (I'm guessing that last problem is due to the crash during the "Optimizing your Mac..." process.) I did try reworking OpenCore config.plist to turn off iGPU support, but the 12.3 system is so unstable now I finally gave up trying. I never did get a chance to run Geekbench to see Metal/OpenCL results after the update.

I'm back now on my usual 12.2.1 boot from my SSD... and staying there until if and when this all gets sorted out.