How to Fix GPU/VMEM stuck to full speed when 2nd display connected
This mini-guide provides a structural approach to troubleshoot and fix the issue.
Prerequisites
- Confirm your hardware specifications (CPU, GPU, Motherboard).
- Ensure you have a bootable recovery USB and backup your EFI.
Fix Steps
- Check if your GPU requires WhateverGreen or specific boot-args (e.g., agdpmod=pikera).
- Ensure Metal acceleration is fully supported for your macOS version.
- Update Lilu and WhateverGreen to the latest versions.
Verification
- Reboot and verify if the functionality is restored and stable under typical usage.
Original Question:
RX 580/i9 10850k on Asus Z490-p, Big Sur 11.1, OC 0.6.5. When 2nd display is connected (DP or HDMI), there's no power management on the GPU. It's stuck at max frequencies (1340/2000 MHz) at all time. With only one display connected, it downclocks properly up to 300/300. Tried Radeonboost.kext to no avail (it did help with this issue earlier in Catalina).
Any tips?
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