Update with recovered kernel evidence for the 2026-08-14 incident
I recovered the system/kernel journal for the affected boot. The journal
had been written to the root filesystem underneath a separately mounted
ZFS /var, which is why journalctl initially showed no kernel entries. I
have preserved the recovered journals and can attach the focused kernel
extract.
The recovered kernel log substantially strengthens the report:
* There were multiple earlier display-related kernel events in the same
boot: NVIDIA Xid 56 at 18:15:36 (twice) and again at 19:14:31. I had
observed more than one external-display corruption/disturbance episode
before the terminal USB/input failure.
* At 19:19:35, Intel xHCI controller 0000:00:14.0 emitted seven messages of the
form:
Event dma ... for ep 5 status 1 not part of TD ...
followed immediately by:
xhci_hcd 0000:00:14.0: WARNING: Host System Error
* In the same second, the IOMMU/DMAR layer reported:
DMAR: [DMA Read NO_PASID] Request device [00:14.0] fault addr 0x400ff78e000
[fault reason 0x04] Access beyond MGAW
* Immediately afterward USB-attached storage commands began failing with
hostbyte=DID_ERROR. At 19:19:36 a USB device disconnected and the kernel
reported that it could not allocate a usb_device. This lines up with the
observed loss of USB keyboard/mouse input and stale USB enumeration.
* UCSI/USB-C logged "ucsi_acpi USBC000:00: unknown error 0" at 19:22:22
and 19:22:25 while the system remained in the failed state.
* I manually unbound xHCI 0000:00:14.0 at 19:38:35. During teardown the
kernel generated a workqueue warning/call trace through cancel_work_sync
-> asus_remove [hid_asus] -> usbhid_disconnect -> usb_remove_hcd ->
xhci_pci_remove -> unbind_store. Rebinding at 19:38:38 recreated the
xHCI buses and devices began enumerating normally again. This restored
the USB mouse/keyboard and the frozen external display.
* The built-in AT Raw Set 2 keyboard is on i8042/serio0 rather than USB.
It remained nonfunctional after the xHCI reset. An atkbd unbind/rebind
caused it to be re-registered by the kernel at 19:41:34, but it still
did not produce usable input. A full reboot restored it.
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https://bugs.launchpad.net/bugs/2163551
Title:
Intel Raptor Lake xHCI stalls with stale USB devices; USB input and
external display freeze, i8042 keyboard also stops responding
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