Bug - Qubes fails to boot if a USB Audio device is connected to the PC

[Grzesiek Chodzicki]

I know that this sounds rather bizarre, but my Qubes instance consistently gets stuck after GRUB menu if a USB Audio device is connected to the computer. So far I have a 3/3 repro rate on that. What type of logs/information should I gather from my machine in order to troubleshoot that?
XL dmesg does print a RMRR warning about USB controllers

Qubes 3.2
Kernel 4.8.12-12
I use a sys-usb AppVM with all controllers hidden from Dom0.

[Andrew David Wong]

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Is your sys-usb set to autostart? If so, try disabling that to see
whether the system can boot.

- --
Andrew David Wong (Axon)
Community Manager, Qubes OS
https://www.qubes-os.org
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[Grzesiek Chodzicki]

Hello Andrew,

The issue still occurs after disabling autostart of the sys-usb AppVM.

[raah...@gmail.com]

Did you make sure you followed these directions? https://www.qubes-os.org/doc/external-audio/

what type of bios boot are you using? Try legacy boot. How much ram does your system have?

What if you just remove the sys-usb and try booting qubes without it while device is attached?

Did you create it manually? After removing the sys-usb vm then rebooting and seeing if qubes boots with the usb attached. Then recreate sys-usb using qubes commands
qubesctl top.enable qvm.sys-usb
qubesctl state.highstate
and repeat audio device instructions.

Try disabling vt-d to identify the bios iommu as possibly the problem. Doublecheck bios options.