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I'm aware that we can not convert HDMI signal to DisplayPort without using an active converter, as covered here and other similar questions

However I'm asking about a special case, where the HDMI source is converted from DisplayPort itself, e.g from a USB-C dock. Can I use a passive cable to revert the HDMI output back to DisplayPort?

Background:

I'm asking this because I had some bad experience of HDMI compatibility issues on Linux. Basically the monitor side would mis-report EDID as supporting YCbCr/FullRGB/LimitedRGB and the GPU driver believes it but it may or may not work. On Windows this is not a huge deal because all GPU driver control panel can force a format but on Linux there's no such interface (AMDGPU is in progress while for Intel/X use xrandr, which is not supported by Intel/Wayland).

Using DVI or DisplayPort makes it much easier as they inherently doesn't support LimitedRGB and YCbCr so there's no ambiguity.

user3528438
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1 Answers1

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Can I use a passive cable to revert the HDMI output back to DisplayPort?

Your USB-C dock or the laptop itself effectively is an active converter from DP to HDMI.
(Likely via DP++)
This means the HDMI port is outputting a normal HDMI signal with no passive compatibility for DisplayPort.

You may have a display that implements DP++ on the input. Which means it could accept HDMI signals over a DisplayPort connector, but this is very uncommmon.

Anything that is passively converting between DP and HDMI connectors is going to be carrying a normal HDMI signal; Which means the color mode information could still be transported and this would not solve your problem.

Romen
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