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I see that on my Surface Pro 6 the HDMI stops functioning on the current update.
I tried the Surface Diagnostic Toolkit and it once corrected the issues ( about 4 weeks back) but then the issue again resurfaced and the tool kit was of no use.
I then reset the device. The HDMI external monitor worked till the cumulative updates were applied and then it stopped again.
Windows Specs are as below:
Edition Windows 11 Home
Version 21H2
Installed on 13-01-2022
OS build 22000.466
Serial number 000356792253
Experience Windows Feature Experience Pack 1000.22000.466.0
Device Specs are as below
Device name AnoopSurfacePro
Processor Intel(R) Core(TM) i5-8250U CPU @ 1.60GHz 1.80 GHz
Installed RAM 8.00 GB
Product ID 00342-23739-62095-AAOEM
System type 64-bit operating system, x64-based processor
Pen and touch Pen and touch support with 10 touch points
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Does it happen after the update?
Have you tried updating the graphic card driver.
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I have a similar problem with a Surface Pro 7+.
Until december it worked fine duplicating my monitor to a HDMI projector.
This week I needed to use the projector daily again and the projector did not detected any sign and the surface screen turns black.
The display driver appears to fail.
I've already installed different versions of the display driver (july2023 version, January2024 version and intel version) but the problem remains.
I've tested duplicating the screen with a regular 24 inch hdmi monitor and it works fine.
I've also tested a VGA projector and it also worked.
It should have been one of the last firmware updates that broke this (there was several firmware upadated in december/january).