How difficult would it be to add HDR flags to the EDID

[Demostrike]

Not my area of expertise but can you add HDR EDID flags so the pc can enable HDR mode? I would like this for streaming HDR from a headless machine

[ge9]

This is discussed at the original repo, but currently not solved.
Maybe impossible with "indirect display driver" technology used in this driver.

[kltye]

Sorry to necro this issue, but it looks like the latest update for IddCx (1.10) has support for wide calour gamut/HDR? Is there a way to easily integrate this?

[ge9]

It's also discussed at the original repo. I'll test it when it's available in my Windows.

[mirh]

Ars reports that most of the features may actually already have shipped in last month 22H2 update.
So maybe that's why the IddCx docs had this weird SV3=September equivalence.

[baloukj]

I did try to look into this but I didn't find the include file for the 1.10 version in the latest version of the wdk.

So I don't know how I can use the new functions described here:
https://learn.microsoft.com/en-us/windows-hardware/drivers/display/iddcx1.10-updates

[mirh]

Try the WDK Insider Preview builds. Of course 10.0.22621.0 (the 22H2 release preview) is lacking.

[ge9]

roshkins#23 (comment)
At least I confirmed IddCxGetVersion function returns 0x1A00 in my Windows 11 machine.
I changed IDDCX_VERSION_MINOR from 0 to 2, so it means 1.2 (not 1.10).
I also don't have directory "1.10" in the folder.
Still I'm not sure "1.2" will work correctly though.

[baloukj]

I managed to get it to work (at least on my pc).
You can try it here : https://github.com/baloukj/IddSampleDriver/releases/tag/0.1.0
If you want to build it, you need to install the WDK Insider Preview builds (Canary) - Build 25997.

It's not the cleanest code ever but I did try it with moonlight on another desktop and it worked.

[kltye]

I managed to get it works (at least on my pc). You can try it here : https://github.com/baloukj/IddSampleDriver/releases/tag/0.1.0 If you want to build it, you need to install the WDK Insider Preview builds (Canary) - Build 25997.

It's not the cleanest code ever but I did try it with moonlight on another desktop and it worked.

OMG THANK YOU!!! It works on my VM running Windows 11 23590.1000 with the Insider Preview WDK. I tried to mess with the code myself but C++ isn't in my wheelhouse, so I didn't get too far.

[ge9]

Great! It worked on my Windows 11 22H2 (not Insider Preview version)!
I recommend announcing your version also on the original repo: roshkins#23
@baloukj
I also confirmed this version (naturally) fails in Windows 10 with "This device is not working properly because Windows cannot load the drivers required for this device. (Code 31)".

[baloukj]

I did try to follow the official documentation to make it work in all windows (detect available version) but i'm not sure as I didn't make any tests.
I just updated the code a little bit to allow 8bit in sdr (it can help with streaming in sdr) and I did try to install it on a windows 10 VM and it seems to work (in sdr).
https://github.com/baloukj/IddSampleDriver/releases/tag/0.1.1

Do you want me to make a pull request ? I really don't have the time to maintain something like this. I didn't spend more than half a day on this, I just wanted to make it work for my personnal usage 🤣

[ge9]

Thanks for your prompt update and helpful testing. I tested it on my physical Windows 10 machine but it stucks with the same error 31... But your initial version may be sufficient for most users.
I currenly don't have Windows SDK Insider Preview build, but I may want your pull request at some time in the future.

[robbely]

Windows 10 would definitely be useful if it can be made to work at some point.

[bayramog]

Did it work on a headless machine?

[bayramog]

Did it work on a headless machine?

I can confirm, it is working on a headless machine. In first try, I believe I tested with unsupported AMD GPU. I switch new Azure VM with different AMD GPU and it worked!

[Uj947nXmRqV2nRaWshKtHzTvckUUpD]

you might want to check this fork https://github.com/itsmikethetech/Virtual-Display-Driver