BIOSes with AGESA 1.0.0.4B caution
Users are reporting that after updating the BIOS to a newer version that has AGESA 1.0.0.4B, the system won’t boot if you have the Xonar card plugged in the motherboard. This happens with other PCI-e cards as well (#1, #2). Most motherboards brands seem to be affected (BIOSTAR #1, Gigabyte #1+, #2, ASUS #1, #2, #3, #4, ASRock #1). If you have an MSI board, it might be fine to update to a BIOS with AGESA 1.0.0.4B (#1, #2). If you don’t want to go to the hassles of updating the BIOS again to the previous version, you should hold off the update. Also, for some motherboards it is not possible to go back to the previous BIOS (ASUS #1, #2).
If you’ve updated the BIOS and the system no longer boots, you could try this: remove the sound card, start the PC and enter the BIOS, look for a setting a called “Initial Display Output” or similar, set it to the PCIe slot in which the main video card is plugged in, save settings and shut down the PC, reinsert the sound card and see if system boots. If it does not, remove the sound card again and revert back to the previous BIOS.
If you run into these issues you could contact your motherboard support letting them know of the issue.
It is a Sound Blaster AE-9 and not a Xonar but maybe still useful information.
ASUS X570 ROG STRIX E-GAMING – 1404 (AGESA 1.0.0.4 Patch B).
With my AE-9 my system will boot, but it takes ~5minutes. After reaching Windows the system is not usable for ~3 – 5 minutes. (CPU usage 100%). After that everything “works”, but the Sound Blaster AE-9 is not recognized.
During boot I cannot enter BIOS. The Sound Blaster logo is lit for around 5 seconds, then the light goes off. My mainboard hangs at status code 92 for a while (PCIe BUS initialization).
I received my ae-9 yesterday, so I had no opportunity to test prior 1.0.0.4. I tried several things (i.e. GEN1 for my PCIe slots).
the AE-9 works just fine on my old ASUS Z170 PRO GAMING.