1
Diagnostic step 1
Collect EDID and HDR metadata: use 'system_profiler SPDisplaysDataType' and a display EDID tool (or the monitor's service menu) to dump reported color primaries and HDR metadata; save these logs before changes.
FULL AI ANALYSIS
macOS 14 external display shows green tint on HDR video only after recent macOS update
Generated Oct 3, 2026, 12:35:03 AM
Analysis summary
The problem is limited to HDR path and a particular monitor when connected to the MacBook, suggesting an HDR color management or EDID/metadata handshake issue between macOS HDR pipeline and that display. SDR path working and other hosts not showing the problem point away from monitor hardware failure. Diagnostics should capture EDID/metadata, verify color profiles, and test alternate handshake methods (different cable, different DP mode). Reversible mitigations include disabling HDR or forcing a custom color profile.
Possible causes
macOS HDR color pipeline regression or change in color primaries handling on macOS 14
85%EDID/HDMI/DisplayPort HDR metadata negotiation mismatch causing incorrect color space selection (e.g., treating BT.2020 as BT.709)
75%Cable or adapter not fully passing HDR metadata (partial mitigation with different cable observed)
60%Monitor firmware bug in handling HDR metadata coming from Apple silicon GPU
25%Suggested fixes
2
Diagnostic step 2
Test with a direct certified DisplayPort/USB-C cable and with an HDMI 2.1 connection via a known-good adapter to see whether handshake differs; document differences.
3
Diagnostic step 3
Create and apply a custom ColorSync profile for the external monitor (Profile Editor) to correct the green tint as a temporary workaround; keep copies of original profiles.
4
Diagnostic step 4
File a feedback report with Apple including collected logs, EDID dump, and steps to reproduce; also test with monitor manufacturer to check for known compatibility notes or beta firmware.
5
Diagnostic step 5
As an interim workaround, disable HDR for that display in System Settings when using color-critical HDR content, or use another display for HDR playback until vendor or OS patch is available.