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Reply To: [Solved] Mac Studio M2 Ultra 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] Mac Studio M2 Ultra encountering External Display Flickering at High Refresh Rates after update (macOS Sequoia 15.1) › Reply To: [Solved] Mac Studio M2 Ultra encountering External Display Flickering at High Refresh Rates after update (macOS Sequoia 15.1)

November 14, 2026 at 11:07 pm #14194
Felix Chen
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.

MacBook Pro 14″ M4 Pro (48GB) | iPhone 15 Pro | iPad Air M2 | San Jose, CA
Apple Certified Support Professional (ACSP) | iOS / Swift Engineer