With a lot of trial and error I figured out the issue but not the cause. This seems to only effect HEVC (x265) videos when drm is successfully enabled with MPV from this repository. If I try a different player, they play fine but no hardware acceleration. If I encode the videos to x264 they play but hardware acceleration fails with the following error [ffmpeg/video] h264: v4l2_request_probe_video_device: set controls failed. Invalid argument (22) The issue is the width of the video. Outside of certain ranges it will display a black video (audio works). It doesn't seem to matter what the height is set to. Eg) 704x480, 704x960 image is displayed. 706x480, 706x960 black screen The ranges go for 14 pixels and each range is separated by 50 pixels. eg) widths in the range of 690 to 704 display an image. Widths between 706 and 752 display a black screen. 754 to 768 display an image. It's a strange one.... Here is a list of ranges that work. Any widths outside of these ranges produces a black screen. It only goes up to 1984 but I'm sure the same rules would apply above this value.

PREEMPT_RT is fully merged in mainline Linux as of 2024 (https://en.wikipedia.org/wiki/PREEMPT_RT).

Here is the updated image with Wifi and EMMC boot https://github.com/sicXnull/armbian-build/releases/download/mxqpro/Armbian-unofficial_26.02.0-trunk_Mxqpro-h313_trixie_current_6.12.74_cinnamon_desktop.img.xz

I just tried booting this LibreELEC test build on my nanopi R6S and to my amazement everything worked great in that build/kernel/bootloader. This means it is technically possible and the ingredients are out there, to bad it isn't on Armbian yet...

Armbian 25.11.2 Noble XFCE (BSP Kernel: 6.1.115) + PanVk - mesa 26.0 (https://launchpad.net/~ernstp/+archive/ubuntu/mesaaco) + Box64 arm64 v0.4.1 ed9827920 (https://ryanfortner.github.io/box64-debs/) + ge-proton10-29 (https://github.com/GloriousEggroll/proton-ge-custom/releases/tag/GE-Proton10-29) (GE-proton is more likely to be segment fault-proof than other wine-proton versions) + dgVoodoo2 (https://github.com/dege-diosg/dgVoodoo2/releases) + DXVK-stripped v2.5.3 30~40fps@720p (low settings, texture high) box64 environment variables: RESIDENT EVIL 6