Public bug reported:
Regression between linux-image-7.0.0-27-generic (works) and
7.0.0-28-generic / 7.0.0-29-generic (broken).
Hardware: OWC Express 1M2 USB4 NVMe enclosure (ASMedia bridge),
connected to laptop's USB4 port. PCIe switch reported as [1b21:2463].
Symptom: LUKS-encrypted NVMe drive inside the enclosure fails to
mount ("Failed to activate device: Input/output error" in Nautilus/
udisks). Works fine when connected via a slower (non-USB4) port.
lspci shows the link fails to complete training:
LnkSta: Speed 2.5GT/s, Width x1
TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
dmesg shows the resulting NVMe failure:
nvme nvme1: controller is down; will reset: CSTS=0xffffffff, PCI_STATUS=0x11
nvme nvme1: Disabling device after reset failure: -19
Possibly related to known ASMedia PCIe switch link-training issues,
see upstream series "PCI: Work around PCIe link training failures"
(Maciej W. Rozycki).
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-29-generic 7.0.0-29.29
ProcVersionSignature: Ubuntu 7.0.0-29.29-generic 7.0.12
Uname: Linux 7.0.0-29-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: fk 5776 F.... wireplumber
/dev/snd/controlC0: fk 5776 F.... wireplumber
/dev/snd/seq: fk 5757 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Fri Aug 14 23:29:02 2026
InstallationDate: Installed on 2026-06-27 (48 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
IwDevWlo1Link: Not connected.
MachineType: ASUSTeK COMPUTER INC. ROG Flow X16 GV601VI_GV601VI
ProcEnviron:
LANG=cs_CZ.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-7.0.0-29-generic
root=/dev/mapper/ubuntu--vg-ubuntu--lv ro pcie_aspm=off
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/30/2024
dmi.bios.release: 5.27
dmi.bios.vendor: American Megatrends International, LLC.
dmi.bios.version: GV601VI.314
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: GV601VI
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 31
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.ec.firmware.release: 3.11
dmi.modalias:
dmi:bvnAmericanMegatrendsInternational,LLC.:bvrGV601VI.314:bd08/30/2024:br5.27:efr3.11:svnASUSTeKCOMPUTERINC.:pnROGFlowX16GV601VI_GV601VI:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnGV601VI:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct31:cvr1.0:sku:pfaROGFlowX16:
dmi.product.family: ROG Flow X16
dmi.product.name: ROG Flow X16 GV601VI_GV601VI
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2163547
Title:
External NVMe over USB4 fails PCIe link training (DLActive-) since
kernel 7.0.0-28-generic, works fine on 7.0.0-27-generic
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