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@Kajen Let me know if you find anything. I also have one device that does not respond to HDMI HPD

Owners of h616/h618 boxes can try warpme's miniarch (from github), its distribution contains the necessary patches for h616/h618, like ddr3/lpddr3/lpddr4 support, hdmi, audio, 100mbps ethernet and etc

I also made a manjaro image for zero3 based on the warpme patches. If anyone wants to compare with armbian and use something for it, there is a link: https://drive.google.com/file/d/10z1Kq6_7NXE4p3n8QfV8MWFcKlicx_9t/view From the very beginning, many things will not work, you need to update the kernel with the command sudo pacman -U ./linux-blahblah.zst : https://drive.google.com/file/d/1Rv7NS364Pc8ZCgyEuN-nnwuI2lINR5W4/view?usp=sharing After the update the kernel mostly things works. For wifi to work, you additionally need to download firmware files. GTA Vice City (PC version) game video: https://drive.google.com/file/d/10WkmibRqYXEb6IzarZRU6FPXSl8BxT-c/view?usp=drive_link

Here: https://github.com/warpme/minimyth2/blob/master/script/kernel/linux-6.6/files/0630-arm64-dts-allwinner-h616.dtsi-add-ths-audio-hdmi.patch I think, that warpme has the most comprehensive patches discussed on #linux-sunxi, including testing new things like a driver for LPDDR3 or LPDDR4 for h616/h618

Here images: https://github.com/warpme/miniarch/releases Quick start guide: https://github.com/warpme/miniarch#quick-start There is no specific forum, since this project is led by one person. I only know about it from the #linux-sunxi developer channel.

I just warned against wasting time on work that has already been done. Having a reference that already works and has been tested is also useful.

There is a warpme development with arch, which contains all the necessary patches, including many test things that have not yet made it to the mainline, but are being tested in linux-sunxi. Support for Zero2 and zero3 was added a very, very long time ago. https://github.com/warpme/minimyth2/tree/master/script/kernel/linux-6.6 HDMI support and everything related to it is handled by jernej, last effort is branch h616-var: https://github.com/jernejsk/linux-1/tree/h616-var