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Reply To: [Solved] Kernel Panic: Sleep Wake Failure on MacBook Pro 14″ M4 Pro: How to resolve SMC driver assertion timeout during standby

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Home › Forums › MacBook, iMac & macOS Lab › [Solved] Kernel Panic: Sleep Wake Failure on MacBook Pro 14″ M4 Pro: How to resolve SMC driver assertion timeout during standby › Reply To: [Solved] Kernel Panic: Sleep Wake Failure on MacBook Pro 14″ M4 Pro: How to resolve SMC driver assertion timeout during standby

November 15, 2026 at 12:50 am #15949
Judith Moeller
Certified Tech (Lvl 5)
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.

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