Unable to select 4K resolution on Sharp 8TC60DWTX (8K) display.

Community Apple Developers
Carrie_Wang OP
Created 5d
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Problem description: Connected to a Sharp 8TC60DWTX (8K) display, but unable to select 4K resolution

Setup Condition Apple MacBook Pro 16-inch M4 Max Sharp 8TC60DWTX (8K)

3.Duplicate Procedure After connecting to 8K MNT and select 4K solution, it still display as 8K.

Vendor analysis: 8K60 shows no image; switching to 30 Hz works normally → After analysis, we found that the 8K60 timing output from the MacBook is incorrect. The horizontal blanking (H-CBlanking) is too small to accommodate the audio data, so the RTD2191E does not output video to the monitor. → This issue does not occur on Windows platforms, confirming that this is a host-side issue.

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DTS Engineer OP
Apple
4d

Our engineering teams need to investigate this issue, as resolution may involve changes to Apple's software. Please file a bug report, include a small Xcode project and some directions that can be used to reproduce the problem, and post the Feedback number here once you do. If you post the Feedback number here I'll check the status next time I do a sweep of forums posts where I've suggested bug reports.

Bug Reporting: How and Why? has tips on creating your bug report.

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Unable to select 4K resolution on Sharp 8TC60DWTX (8K) display.
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