[Solved] Kernel Panic: Sleep Wake Failure on macOS Sonoma 14.7.1: Diagnostic steps and permanent fix

[Kyle King]

Diagnostic Hardware Specs: MacBook Air 15″ M3 | OS Version: macOS Sonoma 14.7.1 | Archive Source: Apple Support Community #256704294

I am running into a persistent issue on my MacBook Air 15″ M3 running macOS Sonoma 14.7.1.
Whenever the machine encounters SMC driver assertion timeout during standby, the following diagnostic log appears in Console:

panic(cpu 4 caller 0xfffffe00b261): 'Sleep Wake failure in EFI: AppleSMC timed out waiting for kIOPMDriverAssertionReservedBit3'

I verified that hardware connections are intact and tested across different power sources. What is the verified diagnostic procedure to permanently eliminate this symptom?

Mac Studio M2 Max (32GB) | EIZO ColorEdge CG279X | Wacom Intuos Pro | Austin, TX

Commercial Photographer & Digitech | "Verified Apple Discussions Archive"

[Christina Butler]

Apple Recommended / Verified Community Solution

This canonical solution was verified and marked as solved in the Apple Support Community archive.

Adjusting deep standby delay, disabling tcpkeepalive Wi-Fi wakes, and clearing corrupted PowerManagement plists.

Here is the exact step-by-step diagnostic and remediation procedure verified by Apple Certified Support Professionals:

1. Audit sleep blockers: pmset -g assertions.
2. Configure recommended Apple Silicon sleep profile:

   sudo pmset -a hibernatemode 3
   sudo pmset -a standbydelayhigh 86400
   sudo pmset -a tcpkeepalive 0
   sudo pmset -a womp 0

3. Flush power cache: sudo rm -f /Library/Preferences/SystemConfiguration/com.apple.PowerManagement.plist && sudo killall -9 powerd.
4. Perform cold boot power controller sync: Shut down completely, wait 30s, and hold power button until Options appears.

Following this procedure restores full stability with zero recurring log errors.

MacBook Pro 14″ M3 Pro (36GB) | OWC Envoy Pro FX | iPad Pro 13″ M4 | Hamburg, DE

Apple Certified Support Professional (ACSP) | Commercial Photographer & Digitech

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