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Reply To: [Solved] MacBook Pro 14″ M1 Max encountering External Display Flickering at High Refresh Rates after update (macOS Sequoia 15.1)

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Home › Forums › MacBook, iMac & macOS Lab › [Solved] MacBook Pro 14″ M1 Max encountering External Display Flickering at High Refresh Rates after update (macOS Sequoia 15.1) › Reply To: [Solved] MacBook Pro 14″ M1 Max encountering External Display Flickering at High Refresh Rates after update (macOS Sequoia 15.1)

November 14, 2026 at 10:33 pm #13588
Christian Cox
Community Contributor
Apple Recommended / Verified Community Solution
This canonical solution was verified and marked as solved in the Apple Support Community archive.

Locking refresh rate to a fixed frequency, disabling Variable Refresh Rate (VRR), and regenerating WindowServer display plists.

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

  1. In System Settings > Displays, set Refresh Rate to fixed 120Hz or 100Hz instead of Variable (VRR).
  2. Reset display preferences: 
    sudo rm -f /Library/Preferences/com.apple.windowserver.displays.plist
rm -f ~/Library/Preferences/ByHost/com.apple.windowserver.displays.*.plist
killall -9 WindowServer
  3. In monitor physical OSD menu, set DisplayPort mode to ‘DP 1.4 Standard’ without aggressive DSC overdrive.

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

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