Note: I am new the forums and there is a posting rate limit in place. Currently it looks like I can only post once every 24 hours for the moment so my turn around is slow.
There are a couple issues that I ran into with the newer kernel builds.
The kernel 5.8.y builds do not reliably startup for me. I have to push reset or unplug-plug-in a few times for it to boot. I suspect but have not proven that it is this issue, I experience it right out of the box which may be different: https://forum.armbian.com/topic/15209-rockpi-s-crashing-at-startup-with-memory-errors/
I intend to use the I2C interface and the overlays do not appear to be present in the newer kernel builds. I can just manually add them, so not a big issue.
The USB-A port is not recognizing the device I have connected to it. The same device works just fine with the 4.4.y kernel builds. Maybe there is an easy solution to this like the I2C overlay that I am just not aware of.
Just an observation, the newer builds result in a 10C increase in idle CPU temperature (as reported in htop). It does not appear to affect anything and it could just be a reporting issue.
Yes it is present in their Debian Buster build as well.
The image improved it quite a lot but like you said, the issue is still there. With the test build the hang was only observable for about a second.
64 bytes from 192.168.1.1: icmp_seq=38 ttl=64 time=4.46 ms
64 bytes from 192.168.1.1: icmp_seq=39 ttl=64 time=6.54 ms
64 bytes from 192.168.1.1: icmp_seq=40 ttl=64 time=648 ms
64 bytes from 192.168.1.1: icmp_seq=41 ttl=64 time=3.74 ms
64 bytes from 192.168.1.1: icmp_seq=42 ttl=64 time=6.43 ms
...
64 bytes from 192.168.1.1: icmp_seq=163 ttl=64 time=6.54 ms
64 bytes from 192.168.1.1: icmp_seq=164 ttl=64 time=8.53 ms
64 bytes from 192.168.1.1: icmp_seq=165 ttl=64 time=1426 ms
64 bytes from 192.168.1.1: icmp_seq=166 ttl=64 time=418 ms
64 bytes from 192.168.1.1: icmp_seq=167 ttl=64 time=8.88 ms
...
64 bytes from 192.168.1.1: icmp_seq=226 ttl=64 time=4.66 ms
64 bytes from 192.168.1.1: icmp_seq=227 ttl=64 time=10.4 ms
64 bytes from 192.168.1.1: icmp_seq=228 ttl=64 time=1281 ms
64 bytes from 192.168.1.1: icmp_seq=229 ttl=64 time=274 ms
64 bytes from 192.168.1.1: icmp_seq=230 ttl=64 time=4.77 ms
64 bytes from 192.168.1.1: icmp_seq=231 ttl=64 time=6.73 ms