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[Solved] How to fix External Display Flickering at High Refresh Rates caused by DSC compression and VRR handshake failure over USB-C DisplayPort on MacBook Pro 16″ M3 Pro

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Home › Forums › MacBook, iMac & macOS Lab › [Solved] How to fix External Display Flickering at High Refresh Rates caused by DSC compression and VRR handshake failure over USB-C DisplayPort on MacBook Pro 16″ M3 Pro

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  • November 15, 2026 at 1:01 am #16154
    Kathleen Reynolds
    Community Contributor
    Diagnostic Hardware Specs: MacBook Pro 16″ M3 Pro | OS Version: macOS Sonoma 14.7 | Archive Source: Apple Support Community #256054388

    I am running into a persistent issue on my MacBook Pro 16″ M3 Pro 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 0x62fe 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 16″ M3 Max (128GB) | iPad Pro 11″ M4 (Apple Pencil Pro) | Minneapolis, MN
    Computer Science & Machine Learning Student | "Verified Apple Discussions Archive"
    November 15, 2026 at 1:01 am #16155
    Jeremy Long
    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.

    Mac Studio M2 Max (32GB) | EIZO ColorEdge CG279X | Wacom Intuos Pro | Geneva, CH
    Apple Certified Support Professional (ACSP) | Commercial Photographer & Digitech
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