Rotation Sensor Wonky

[László Jánoky]

I wasn’t able to solve the problem completely, but here’s what I found:

1. The sensor is a KIONIX KXCJ9-10xx which according to the spec sheet (http://www.kionix.com/parametric/Accelerometers) is rated between 1.8-3.6V and communicates on the I2C bus.
2. Looking at the device manager, I found out that its at the 0th address on the I2C bus (\_SB.PCI0.I2C0.KXJ0)
3. Previously I ran trough the BIOS while searching for a disable option, and noticed that there is a dedicated settings page for the I2C bus. My plan was to disable the I2C0 device (or set the voltage to 0V, effectively disabling it). However there was no such option, I couldn’t disable it, and could only change the voltage to 1.8V (default was 3.6V). This seemed to mostly solve the issue, I encountered the bug only very briefly afterwards (4-5 seconds in a week).

So probably either the sensor is not according to the spec, or the tablets power-supply is fluctuating, overvolting the sensor sometimes.

[Mario Fajardo]

Is the sensor or the pogo pin? I know in mine if I touch all the pins at once with my finger it triggers the “Autorotate on/off” on Windows 10. Windows 8.1 is impervious to that problem from what I’ve tried.

[Author]

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