Kernel panic in AMD GPU drivers on bootup after 10.14.5 Beta 2 about hac-mini

[osy]

This issue is showing up in 10.15.1 and the workaround no longer works.

[desert0616]

I am facing a very similar issue on my Macbook Pro 2015 (rx450). Even though the GPU on NUC8 is named vega but it should be of old architecture, so I think the it is a driver bug for Polaris.

[jasanders]

Will this change in 10.15.4 Beta 1 impact this bug?
https://www.reddit.com/r/hackintosh/comments/ezr3e5/macos_10154_beta_1_gives_back_drm_to_polaris/

[osy]

Interesting, we’ll have to see.

[osy]

Figured out the issue. Polaris22_UploadSMUFirmwareImageDefault calls PECI_IsEarlySAMUInitEnabled to check if SMU firmware can be loaded directly. PECI_IsEarlySAMUInitEnabled looks at bit 0x160 of CAIL_DDI_CAPS_POLARIS22_A0 which should be 0. But it is 1, leading the firmware to not be loaded. Patching the function to return 0 will fix it.

It worked before by chance. AtiAppleCailServices::isAsicCapEnabled was updated to include Polaris22 settings. Previously it wasn't there so it defaulted to 0.