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https://bugs.launchpad.net/bugs/2146521
Title:
[Resolute Mar 26 beta] Boot hang / IOMMU Fault on Ryzen 9800X3D + RX
9070 (Gigabyte B650M DS3H) - Missing IOMMU 0x0 Mapping Fix
Status in linux package in Ubuntu:
New
Bug description:
Description:
The Ubuntu 26.04 (Resolute Raccoon) Beta ISO (Kernel 7.0.0-7-generic) fails to boot on my system featuring the Ryzen 7 9800X3D and RX 9070, specifically on the Gigabyte B650M DS3H motherboard. The boot process hangs indefinitely during IOMMU initialization.
Hardware Environment:
CPU: AMD Ryzen 7 9800X3D
GPU: AMD Radeon RX 9070 (RDNA 4)
Motherboard: Gigabyte B650M DS3H (Latest BIOS)
Status: Secure Boot Enabled, IOMMU Enabled in UEFI.
Problem Details:
This is a known regression from 6.19 where the IOMMU fails to correctly handle the 0x0 IOVA mapping, leading to an IO_PAGE_FAULT and a subsequent kernel panic or hard hang.
I have previously tracked and verified this issue in both Fedora and
Arch:
Fedora: I reported in Bugzilla (Kernel 6.19 Test Week). I
coordinated with Justin Forbes and the Fedora QA team during the
Fedora Blocker call to have this patched in 6.19.8-200 build:
https://bugzilla.redhat.com/show_bug.cgi?id=2443049
Arch: I reported and verified there as well.
Other users in Fedora and CachyOS with various AMD hardware had the
issue and the patch fixed it.
The Solution:
The specific fix is is authored by Antheas Kapenekakis:
https://lkml.org/lkml/2026/2/27/464
I believe this might have been merged in 7.0RC5 (after speaking with a
NixOS kernel maintainer who mentioned it), but if not would it be
possible to verify that this was indeed merged and make sure it does
land in Ubuntu as well?
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