i have a Lenovo ThinkPad Helix, which has a multi-sensor hub attached to a magnetometer, gyroscope, accelerometer, ambient light sensor, and possibly others. it uses the Intel Integrated Sensor Solution sensor hub, which works through the kernel driver "hid-sensor-hub". this driver is included with the stock Arch kernel, and it loads automatically and lists attached sensors in the appropriate location under /sys/bus/hid/. however, while all of its attached sensors are supported in the kernel, their respective drivers (such as "hid-sensor-als", "hid-sensor-accel-3d", "hid-sensor-gyro-3d") are not compiled and included as modules by default, and nor is the iio (industrial i/o) subsystem they rely upon. as more and more computers (especially ultraportable convertibles and tablets) include sensor hubs of this type, also driven by iio-reliant drivers, i feel that the iio subsystem should be supported.

here are a couple examples of what i'm referring to, on other devices: [url=https://bbs.archlinux.org/viewtopic.php?pid=1401396#p1401396]a mention of arch's omission of these drivers[/url] and [url=http://askubuntu.com/questions/355790/how-to-use-iio-on-surface-pro-to-access-sensor-data-in-ubuntu-13-04]ubuntu clearly has this working fine[/url]