To summarize once more: Actual behavior: On the Lenovo ThinkPad T14s Gen 6 with Ubuntu 26.04 LTS and kernel 7.0.0-15-generic, the Chicony integrated camera (04F2:B83F) exposes a HID sensor hub that creates two IIO devices: HID-SENSOR-200011.2.auto -> iio:device0 and HID-SENSOR-200011.4.auto -> iio:device1. Both devices appear to be proximity/attention sensors only (prox), and no ambient light / illuminance channel is exposed to userspace.
Expected behavior: If this hardware includes a combined proximity + ambient light sensor, the kernel’s HID/IIO stack should expose the ALS portion as an IIO light device with attributes such as in_illuminance_raw and in_illuminance_scale, so that iio-sensor-proxy and desktop environments can use it for automatic screen brightness. Impact: Because no ALS-related sysfs attributes are present under /sys/bus/iio/devices/, iio-sensor-proxy cannot publish an ambient light sensor to userspace. As a result, GNOME/KDE auto-brightness does not work on this system. Additional notes: The issue appears to be a partial HID/IIO support problem for the Chicony 04F2:B83F sensor hub, where the proximity part is detected but the ALS part is not mapped to userspace. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2151784 Title: No ALS (ambient light sensor) exposed on ThinkPad T14s Gen 6 – Chicony 04F2:B83F HID sensor hub only provides proximity IIO devices To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2151784/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
