Created attachment 204946 [details]
12.0-STABLE r348775 GENERIC amd64 hangs with hw.dmar.enable=1
System - HP ProLiant DL360 G7
Created attachment 204947 [details]
dmesg without hw.dmar.enable=1
r346352 was done exactly to fix G7 issues. It might be G8, but still should be very close.
To make any progress with this, re-check with HEAD. If the results are similar, provide acpidump -dt output.
(In reply to Konstantin Belousov from comment #3)
In r346352 I reading: "MFC after: 1 week"
Can you bring it to 12-STABLE ?
I do not have the opportunity to update FreeBSD to HEAD on this server.