USB hardware support for Fedora kernels

[jbbletterman]

Description of problem:
The HP ProBook 450 G8 works with Fedora 34 Workstation. However, we use Fedora kernels from Koji to create initrd's en vmlinuz's for PXE network boot images and USB mountable images. When doing this, using the latest kernels (5.11.1X), the PXE images work, but without audio (although this can be fixed with kernel parameters, which disable the mic). The USB images get kernel panics. The same images we generate work on 90% of our other systems, so we know they are hardware/kernel specific.

We usually build our images using Fedora 34 Docker containers, with kernels 5.11.13, 5.11.16, 5.11.17, 5.11.18 and 5.11.19. We get kernel panics 100% of the time, when booting over USB.

Steps to Reproduce:
1. Generate initrd and vmlinuz using cpio and dracut.
2. Try to boot through USB.
3. Get a kernel panic.

Actual results:
Device never gets past a kernel panic. Therefore, there is no dmesg logging and kernel parameters can't be applied.

Expected results:
Boot properly into the kernel, without the need for extra parameters.

Additional info:
Our client owns hundreds of these systems, they would like to have our application working as soon as possible. Would like to see support for this in the form of UEFI firmware updates for this device. A similar ticket has already been issued towards Red Hat: https://bugzilla.redhat.com/show_bug.cgi?id=1955536.

[jbbletterman]

Is there anybody out there having similar USB/UEFI related boot problems with Linux kernels giving a panic over USB, but working fine over iPXE?