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[Solved] How to fix Kernel Panic: Sleep Wake Failure caused by SMC driver assertion timeout during standby on MacBook Pro 16″ M3 Max

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Home › Forums › MacBook, iMac & macOS Lab › [Solved] How to fix Kernel Panic: Sleep Wake Failure caused by SMC driver assertion timeout during standby on MacBook Pro 16″ M3 Max

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  • November 15, 2026 at 12:35 am #15684
    Frank Porter
    Community Contributor
    Diagnostic Hardware Specs: MacBook Pro 16″ M3 Max | OS Version: macOS Sequoia 15.1.1 | Archive Source: Apple Support Community #256405641

    I am running into a persistent issue on my MacBook Pro 16″ M3 Max running macOS Sequoia 15.1.1.
    Whenever the machine encounters SMC driver assertion timeout during standby, the following diagnostic log appears in Console:

    panic(cpu 6 caller 0xfffffe002657): '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 Ultra (128GB) | ASUS ProArt PA32UCG-K | OWC ThunderBay 8 | Portland, OR
    Final Cut Pro / DaVinci Colorist & Editor | "Verified Apple Discussions Archive"
    November 15, 2026 at 12:35 am #15685
    Aria Moreno
    Community Contributor
    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.

    iMac 24″ M3 (16GB) | AST 2 Diagnostic Station | ESD Workstation | Zurich, CH
    Apple Certified Support Professional (ACSP) | Apple Certified Service Technician (ACiT / ACSP)
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