SYSTEM
Fedora 43 KDE
CPU: AMD Ryzen 9900X
GPU: Nvidia, nvidia-open drivers via RPM Fusion akmods
Repos: Clean Fedora 43 stable only, no beta/testing enabled


PROBLEM
Kernel 6.19.6-200.fc43.x86_64 arrived as a standard stable Fedora 43 update
on March 7th 2026 and fails to boot completely.
Kernel 6.18.x boots normally with no issues.


SYMPTOMS
- System hangs at Fedora spinner indefinitely (25+ minutes, never proceeds)
- USB devices lose power completely during boot (keyboard/mouse lights go out)
- Never reaches login screen or desktop


WORKAROUND
Adding iommu=off to kernel boot parameters resolves the issue completely.
System boots normally with this parameter set.


STEPS TO REPRODUCE
1. Boot Fedora 43 system with AMD Ryzen CPU into kernel 6.19.6-200.fc43.x86_64
2. System hangs at boot spinner, USB devices lose power
3. Add iommu=off to kernel parameters
4. System boots successfully


WHAT WAS TRIED BEFORE FINDING WORKAROUND
- Rebuilt nvidia module: sudo akmods --force --kernels 6.19.6-200.fc43.x86_64 (succeeded, no errors)
- Rebuilt initramfs: sudo dracut --force (succeeded, no errors)
- No failed akmods logs found in /var/cache/akmods/nvidia/


ADDITIONAL NOTES
This issue has been reported by other AMD Ryzen users on Fedora 43 and also
reproduces on Arch Linux, suggesting this is an upstream kernel regression
rather than a Fedora-specific issue.

Reference: https://discussion.fedoraproject.org/t/kernel-6-19-gives-io-page-fault-error/181925

Reproducible: Always