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Reply To: Diagnostic query: Unexpected kernel panic on macOS Sequoia 15.1 after waking (1794691713)
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Rachel KimThe AppleThunderboltNHI panic frequently correlates with a DisplayPort MST hub renegotiation storm triggered by WindowServer’s aggressive GPU context restore; capture a sysdiagnose immediately post-wake and grep for WindowServer CPU time exceeding 200% in top -l 1 -stats pid,command,cpu to confirm runaway compositing. Strip all third-party login items (defaults read com.apple.loginitems) and Safari extensions (defaults read com.apple.Safari ExtensionsEnabled), then test wake reliability with only Apple silicon native processes—WebKit’s GPUProcess often leaks IOSurface references across sleep when hardware-accelerated video decode is active. As a hardware isolation step, connect the external display directly via USB-C/DP alt-mode bypassing the dock; if the panic ceases, the dock’s firmware PD controller is violating the Thunderbolt NHI spec’s kIOPCIPowerState transition timing.