Public bug reported:
Hello,
On 2026-10-29 at around 14:45 CET, my mouse, USB headphones and
microphone, and built-in keyboard suddenly stopped working at the same
time. The touchpad still worked. Unplugging/reconnecting the USB-C hub
and trying another port didn't help. I used the touchpad to restart, but
the system then appeared completely frozen and I had to hold the power
button to turn it off.
The previous boot's kernel journal recorded this at 14:45:30:
DMAR: DRHD: handling fault status reg 2
DMAR: [DMA Read NO_PASID] Request device [00:14.0] fault addr 0xffd8a000 [fault
reason 0x80] SM: Address in first-level translation is not canonical
System: ASUS ROG Zephyrus G14 GU405AR, BIOS GU405AR.305, Ubuntu 26.04.1 LTS
(x86_64).
Affected kernel package: linux-image-7.0.0-38-generic, version 7.0.0-38.38
(Ubuntu kernel 7.0.14).
00:14.0 is the Intel USB xHCI controller used by the affected USB
devices. The hub reconnects logged at 14:46-14:47 were my recovery
attempts after the failure. I've retained the kernel/shutdown logs and
detailed hardware information as separate files.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: iommu resolute usb
** Attachment added: "Kernel version signature from /proc/version_signature"
https://bugs.launchpad.net/bugs/2172459/+attachment/6013380/+files/version.log
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https://bugs.launchpad.net/bugs/2172459
Title:
USB devices and built-in keyboard stop working with xHCI DMAR fault;
restart stalls
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