Intel VAAPI howto with Leia v18 nightly based on Ubuntu 18.04 server
Yeah - that's exactly the problem.

Short term workaround, add a "passthrough" mode - that just skips the conversion, but still sends info frame limited :-)

What daniels wants: DRM buffers that have a color attribute and then intel handles it internally accordingly, which is - i have to admit the "king way" of doing things. But DRM / MESA is not there yet and kernel is also not.

So - let's come up with a passthrough kernel patch.

Who is up for the task?

1.) add passthrough
2.) add passsthrough_mode bool
3.) check for passthrough_mode -> don't clamp.
4.) add this attribute to the list where you find Full and "Limited 16:235"
5.) Passthrough should force "Limited 16:235" but not to scale :-)

@Sunflux: Sounds like a job for you, isn't it?
First decide what functions / features you expect from a system. Then decide for the hardware. Don't waste your money on crap.
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Intel VAAPI howto with Leia v18 nightly based on Ubuntu 18.04 server18