Newer Lenovo ThinkPad systems feature a security feature called USB-C Security Restricted Mode that is in the process of being wired up for reporting under Linux.

When USB-C Security Restricted Mode is enabled, power delivery is enabled but the USB-C data connections are disabled. Thus preserving USB charging capabilities while not allowing any USB data transfers to take place. The intent here is for kiosk-type deployments or physically-secured environments where not wanting to permit any USB data transfers or protecting against potential malicious USB-C devices.

The USB-C Security "USCS" feature is being enabled under Linux for toggling by the ThinkPad ACPI driver. On capable newer ThinkPads with this security feature, the support can be enabled by Fn+U and Fn+S key sequences.

[1]

With this Linux enablement, on capable Linux systems the current state of this USB-C security feature will be exposed via /sys/devices/platform/thinkpad_acpi/usb_c_security for reflecting whether it's enabled or disabled -- or checking the presence of the file to see if the feature is available on your particular Lenovo system.

[2]This patch series has that latest Lenovo ThinkPad ACPI driver work for this USB-C security feature.



[1] https://www.phoronix.com/image-viewer.php?id=2026&image=lenovo_usbc_lrg

[2] https://lore.kernel.org/platform-driver-x86/20260709021504.465792-1-vishnuocv@gmail.com/