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October 4th, 2025 01:17
U3225QE DP cannot be connected with MST on
Hi,
I noticed that my U3225QE DP shows no signal if the MST is on, but ThunderBolt cable works fine with MST, I have updated the firmware to the latest version M2T102, and the GPU drivers also the latest. I also tried both Windows and Linux, it looks like my monitor issue, since the MST works fine with my other monitor (DP-in)C2422HE + P2422H
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DELL-ChrisM2
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October 4th, 2025 12:04
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When the U3225QE Menu--> Display--> MST is set to On (pages 60-61)
Are you saying that the U3225QE #5 DP 1.4 OUT port is not working connecting to the DP IN port on the second daisy chained monitor?
Marshall Shao
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October 4th, 2025 14:15
Hi thanks for your reply.
Both were not working, if my first monitor (U3225QE) with DP 1.4 in MST enabled, then it shows nothing and my second monitor P2422H(DP 1.4 connnected to first monitor) also shows nothing. If I turn my first monitor (U3225QE) MST off, then the first monitor working but second monitor shows nothing.
However, I tried reinstall the firmware(M2T102) just now, it seems ok and everything works fine. Previously, I updated the firmware via Dell Display and Peripheral Manager windows app, and today I downloaded same version from Dell webpage and installed manually.