[Solved] How to fix Kernel Panic: Sleep Wake Failure caused by SMC driver assertion timeout during standby on MacBook Air 15″ M3

[Aaron Diaz]

Diagnostic Hardware Specs: MacBook Air 15″ M3 | OS Version: macOS Sequoia 15.1 | Archive Source: Apple Support Community #256735206

I am running into a persistent issue on my MacBook Air 15″ M3 running macOS Sequoia 15.1.
Whenever the machine encounters SMC driver assertion timeout during standby, the following diagnostic log appears in Console:

panic(cpu 6 caller 0xfffffe00343c): '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?

iMac 24″ M3 (16GB) | Kawai MP11SE Stage Piano | AirPods Max | Hamburg, DE

Classical Pianist & Spatial Audio Arranger | "Verified Apple Discussions Archive"

[Eva Cook]

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 Air 15″ M2 (16GB) | GoPro Hero 12 Black | Apple Watch Ultra 2 | Brooklyn, NY

Apple Certified Support Professional (ACSP) | Digital Nomad & Travel Filmmaker

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