This code implements auto-rotate functionality on the Yoga 900 by coupling iio-sensor-proxy to xrandr.
Still works perfectly. Last compiled and tested: Dec. 2017.
Install dependencies, for example:
sudo apt-get install iio-sensor-proxy libxrandr2 libglib2.0-dev
Just compile and install by running:
make
sudo make install
To use with systemd (RECOMMENDED):
make config-systemd
To just give it a test run:
make run
To use with systemV (not tested and fully implemented):
make config-systemv
There might be mismatches between iio-sensor-proxy and the kernel. I have also experimented with running iio-sensor-proxy from source:
git clone https://github.com/hadess/iio-sensor-proxy
sudo apt-get install gtk-doc gtk-doc-tools libgudev-1.0-dev libgtk-3-dev
./autogen.sh
./configure --prefix=/usr --sysconfdir=/etc
make "CFLAGS=-Wno-unused-result"
sudo make install # sudo checkinstall (my preference)
And run the following as root:
G_MESSAGES_DEBUG=all /usr/sbin/iio-sensor-proxy
The system package was actually sufficient in my case (1.3-1ubuntu1).
Somehow at my system it only starts working after closing and opening the lid once.
Regarding battery use, the auto-rotate daemon is compared to a script (see /scripts) that use dbus-monitor in a (blocking) read loop.
Results:
| description | auto-rotate | dbus-monitor |
|---|---|---|
| system calls | 199 | 39284 |
| system calls (read) | 6 | 27276 |
| cpu (sys) | 0.01% | 0.20% |
| cpu (user) | 0.00% | 0.04% |
| context switches | 3.52/sec | 666.13/sec |
This code is created using the example code by Bastien Nocera from the monitor-sensor.c example at https://github.com/hadess/iio-sensor-proxy. It is adjusted for auto-rotate functionality on Yoga 900 by Anne van Rossum. It is subsequently adjusted on request to rotate any touch device by Anne van Rossum using code from Shih-Yuan Lee at https://github.com/fourdollars/x11-touchscreen-calibrator.
Copyright licence: GPLv3.
It is reported as tip at hadess/iio-sensor-proxy#129. The author of iio-sensor-proxy assumes a desktop developer should be the person to integrate it. The code in this repository directly uses X through xrandx, so can be used by many desktops as long as they use X. However, I have no clue who I should contact to get a working auto-rotate function the default experience for everyone using Linux on a Yoga 900. Help to get it in into any OS appreciated!