Hello there, I am new to this list too! Despite that, I think I can help
you.
It is more likely that the issue is caused by the ASMedia controller or
the disks. I have such a controller but it might not be the same
revision.
If the controller is causing the lockup, I can try something but I will
need more information to verify my thought. First of all send here the
output of:
lspci -nn
and I will tell you later what else is needed.
If the disks are causing the lockup, I can tell you which one is the
faulty disk(s). For each attached disk send the output of:
sudo smartctl -a /dev/sd*
I hope that your disks are fine as you will have a lot of job to do
prior RMA if anyone is dying. It might be a good idea to find their
receipts...
