@Popolon indeed this issue rot for a long time. I cleaned up my backlog to have more time for armbian. Also I still have quite a few processes to learn about armbian board maintenance still to this day. But you confirm that with mainline 6.12 all is fine ? But, indeed no HDMI out and no audio. I still have a patch for mainline 6.12 in the pipe about a race condition between SATA chip and nvme as far as I remind. I will prioritize data vendor kernel debugging if this mainline patch is not required (and indeed mainline still lacks any multimedia capability, this might be a showstopper for most users) even though I am close to complete testing and send PR for this one. As of now I have confirmed that this mainline patch set does not help vendor as the vendor branch has a hack that workaround the issue that mainline faces about this SATA/nvme race.

I haven't checked yet, first of all I was interested in the main core of 6.15

Tried again kernel 6.12, still no display, and it looks, like SATA instability depend on kernel version for 6.1 and have to stop/start several time the power to have it work on recent one. A bit tired of this too. It will probably not be good for the hardware to start/shutdown several time the power. After SATA disks are up they work parfectly. Looks like a power management bug, but not sure?

Did you give BSP kernel source 6.6 a try?

100mbps is enough for all my projects. if not, there are some usb3 gigabit adapters