Public bug reported:
Kubuntu 26.04, kernel 7.0.0-34-generic (Ubuntu package 7.0.0-34.34)
Machine: Lenovo ThinkPad L490, type 20Q5
BIOS: R0ZET60W (1.38)
Controller: Intel Cannon Point-LP USB 3.1 xHCI [8086:9ded], PCI 0000:00:14.0
Sleep mode: deep (s2idle is also advertised)
Lenovo USB-C dock attached (USB hubs 17ef:3072 and 17ef:3073).
Repeated failure after suspend/resume, including automatic idle suspend.
Latest occurrence: 2026-09-29, suspend 09:15:10 CEST, resume 09:27:10 CEST.
Expected: USB devices reconnect and remain usable after resume.
Actual: all USB devices disappear, including dock keyboard/mouse and internal
Goodix fingerprint sensor. External monitor continues working. lsusb shows only
USB2/USB3 root hubs. Internal keyboard and touchpad remain usable.
Kernel messages:
xhci_hcd 0000:00:14.0: xHCI host not responding to stop endpoint command
xhci_hcd 0000:00:14.0: xHCI host controller not responding, assume dead
xhci_hcd 0000:00:14.0: HC died; cleaning up
usb 1-4.4.4: PM: dpm_run_callback(): usb_dev_resume returns -22
usb 1-4.4.4: PM: failed to resume async: error -22
Followed by disconnection of all USB devices.
Recovery: unbind and rebind PCI 0000:00:14.0 from xhci_hcd restores USB without
reboot.
The issue also occurred on 2026-09-24. A separate fingerprint daemon hang
occurs following USB re-enumeration; restarting fprintd fixes that symptom. A
local sleep service now stops fprintd before suspend and starts it after
resume, but the whole-controller failure still occurs.
No controlled comparison with older kernels or suspend without the dock has
been performed, so a kernel regression is not yet established.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "Sanitized report and USB topology collected after
recovery"
https://bugs.launchpad.net/bugs/2168830/+attachment/6003547/+files/USB-report-public.txt
--
You received this bug notification because you are a member of Ubuntu
Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2168830
Title:
Intel Cannon Point-LP xHCI controller dies on resume from deep suspend
on Lenovo ThinkPad L490
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2168830/+subscriptions
--
ubuntu-bugs mailing list
[email protected]
https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
