Please use the latest Debian image for test.
VisionFive 2 Debian Image(December) Released - VisionFive 2 （English Forum) - RVspace Forum.
Secondly, HDMI output related commands: https://doc-en.rvspace.org/VisionFive2/Developer_Guide/JH7110_SDK_DG_Multimedia.pdf
Thirdly, risc-v IC is relatively new and needs to be constantly updated and improved. Please kindly understand.
Finally, The following form was the verified display model, and now VF2 HDMI compatibility is still being optimized. Please kindly check it.