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‎07-20-2025 03:29 AM

HP Recommended
Product: HP Series 7 Pro 27 inch QHD Thunderbolt 4 Monitor - 727pu
Operating System: Microsoft Windows 11

Monitor HP 727pu occasionally not sharing video signal via Daisy chain to Dell U2412M (DP1.1)

Set-up is feeding video from NTB via Thunderbolt (USB-C1) OR from PC via DP+USB-C2. Switching between them (KVM).

Using Thunderbolt from NTB (USB-C1) everything works fine (every time) and video is correctly send to both monitors (HP+Dell),

Using DP+USB from PC (RTX4070 Super) works only 33% of the time. Usually Dell falls into Failsafe 640x320. After some investigation it seems it can be solved by manual re-connecting Dell DP or by Dell power OFF-ON. But this is not what I expect from Daisy-chain enabled monitor with KVM. Theoretically Dell monitor with DP1.1 should be able to work correctly as last in the chain and on SST it always worked correctly.

I was using older version of HP firmware only few hours, but the issue never happened. While after firmware update it is difficult to connect Dell correctly in FullHD. Usually need to amke power-reset of Dell every time I disconnect NTB and witch back to PC.
Is there a possibility to return to older version of HP firmware or solve this by firmware update of HP?
I am not interested in buying MST splitter or purchasing new monitor when my current set-up should be compatible.

HP 727pu.png

 

Thank you for your suggestions.

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