Re: UCSI: no connector change events for connector 2 on Lenovo Legion Pro 7 16IAX10H (Arrow Lake-HX) — port functional in Windows

[Heikki Krogerus <heikki.krogerus@linux.intel.com>]

On Fri, Jul 10, 2026 at 06:25:08AM -0500, Trabajos Iafast wrote:
> Hi,
> 
> I'd like to report a UCSI issue on a Lenovo Legion Pro 7 16IAX10H
> (model 83F5), Intel Core Ultra 9 275HX (Arrow Lake-HX), where one of
> the two side-mounted USB-C ports is non-functional under Linux (no DP
> Alt Mode, no data, no hotplug detection), while working fully under
> Windows 11 on the same machine (dual boot).
> 
> System:
> - Kernel: 6.17.0-35-generic (Ubuntu 24.04.4)
> - BIOS/EC: Q7CN78WW (latest, issue also present on Q7CN33WW)
> - USB4 silicon: Intel Gen14, 8087:7ec2, firmware 15.1
> - Secure Boot: disabled
> 
> Symptoms:
> - /sys/class/typec shows port0 and port1. port0 works fully.
> - port1 gets a partner device enumerated at boot (PD 3.0,
>   supports_usb_power_delivery: yes) but number_of_alternate_modes
>   stays 0 and usb_power_delivery_revision reads 0.0.
> - No typec uevents are ever generated for port1 on plug/unplug
>   (verified with udevadm monitor; port0 generates remove/add/change
>   normally).
> - typec port1 never binds to usb4_port3; the "connector" symlink
>   under domain0/0-0/usb4_port3 is missing (port0 <-> usb4_port1
>   binds correctly).
> - dmesg is completely silent: no ucsi/PPM errors at all.
> 
> UCSI debugfs probing (/sys/kernel/debug/usb/ucsi/USBC000:00):
> 
> GET_CAPABILITY:
>   0x01300300012000020000040200000144
>   -> bNumConnectors = 2 (both connectors are exposed to the OS)
> 
> GET_CONNECTOR_STATUS connector 1 (working):
>   0x01300300012000011304b12c405b4000
> GET_CONNECTOR_STATUS connector 2 (broken):
>   0x01300300012000011304b12c405b0000
> 
> The responses are identical except the Connector Status Change
> field: 0x4000 (Connect Change) on connector 1, 0x0000 on connector 2,
> with a monitor attached to both ports. The EC appears to report
> connector 2's status when polled but never raises connection change
> events for it, so the event-driven ucsi driver never processes the
> port. Windows 11 (Microsoft UCSI connection manager, driver
> 10.0.26100.8521) handles the same port without issues, DP Alt Mode
> included.
> 
> Ruled out: BIOS/EC update to latest (Q7CN78WW), EC power drain,
> thunderbolt module reload, PCI remove/rescan of the USB4 NHI,
> ucsi_acpi/typec_ucsi reload (port1 never rebinds), kernels 6.14 and
> 6.17. No retimer firmware available via LVFS for this model.
> 
> Happy to provide acpidump, full sysfs dumps, or test patches.

I'm seeing this mail in my inbox three times?

In any case, like I said before, please contact lenovo. The FW really
has to report the connector changes.

Thanks,

-- 
heikki