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…reezes on modern kernels
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Summary
While modern kernels handle BCE/VHCI sleep transitions through
t2bce, several hardware models and configurations (notably multi-core MacBookPro16,1, 15,1, and setups with Touch Bar DRM / dGPU) still experience post-wake kernel panics, unresponsive Touch Bar/keyboard (t2bce_vhcidesync), and Wi-Fi interface hangs.This PR adds a brief troubleshooting reference in
docs/guides/postinstall.mdunder the Suspend section pointing to apple-t2-suspend-fix, a community systemd mitigation suite tailored for Linux 7.1+ /t2bce_*setups that orchestrates CPU 0 IRQ pinning, safe pre-sleep driver teardown, and post-resume bus stabilization.This provides an immediate reference for users experiencing persistent sleep crashes without altering the existing core recommendation.