Applies also to AC 9461 and 9462
After recent upgrades my laptop froze while booting up, looking up the problem I found that the iwlwifi module looped and finally kernel-paniced with
Applying debug destination EXTERNAL_DRAM
FW already configured (0) - re-configuring
The problem is faulty firmware in the fimware-linux=2019717-1 pkg. It is acttually an old Kernel 5.1 bug that was upstreamed again. Hail the intel QA.
The 5.2 Kernel uses iwlwifi-9000 v46 which is the faulty one.
If you boot with acpi=off (if boot freezes) and
cd /lib/firmware sudo cp iwlwifi-9000-pu-b0-jf-b0-41.ucode iwlwifi-9000-pu-b0-jf-b0-46.ucode
it works again. Just overwrite the faullty version with last one that worked.
Fixed it for me. Took me whole Sunday, only to find out that I could’ve fixed it faster by properly googleing it.