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[Solved] MacBook Pro 14″ M1 Max encountering External Display Flickering at High Refresh Rates after update (macOS Sonoma 14.7)

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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 Sonoma 14.7)

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  • November 14, 2026 at 10:03 pm #13077
    Lisa Lewis
    Certified Tech (Lvl 5)
    Diagnostic Hardware Specs: MacBook Pro 14″ M1 Max | OS Version: macOS Sonoma 14.7 | Archive Source: Apple Support Community #256241576

    I am running into a persistent issue on my MacBook Pro 14″ M1 Max running macOS Sonoma 14.7.
    Whenever the machine encounters DSC compression and VRR handshake failure over USB-C DisplayPort, the following diagnostic log appears in Console:

    WindowServer: [com.apple.WindowServer:server] Display 0x659e link training failure / DSC buffer renegotiation

    I verified that hardware connections are intact and tested across different power sources. What is the verified diagnostic procedure to permanently eliminate this symptom?

    MacBook Pro 14″ M3 Pro (36GB) | Focusrite Clarett+ 8Pre | Beyerdynamic DT 1990 | San Diego, CA
    Logic Pro Audio Producer & Mixing Engineer | "Verified Apple Discussions Archive"
    November 14, 2026 at 10:03 pm #13078
    Timothy Krueger
    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.

    Apple Vision Pro (512GB) | MacBook Pro 16″ M3 Max | Magic Trackpad | Berlin, DE
    Apple Certified Support Professional (ACSP) | visionOS Spatial Computing Developer
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