installing eGalax touchscreen drivers on Android-x86

[Rich Tatham]

I've tested various flavours of Android x86, from 4.4 up to 7.1 as well as Bliss and Lineage. They all have one thing in common: my touchscreen axes are flipped. This means when I swipe left, a mouse cursor displays moving down. Swipe down moves right, and so on.

I can't find any relevant information on installing custom drivers to an Android version to fix this. Drivers exist (http://www.eeti.com.tw/drivers_android.html), but all I can find when googling is references to other Android builds like Odroid or Raspberry pi.

Can anyone give me some pointers on fixing this issue? What version on Android to download, how to do it all in Linux etc? I'm a windows user, so all these sudo commands are a bit Greek to me.

[Michael Goffioul]

Check first whether this file exists on your system: /data/misc/tscal/pointercal

If it doesn't, execute the following commands in "adb shell":

                mkdir -p /data/misc/tscal

                touch /data/misc/tscal/pointercal

                chown 1000.1000 /data/misc/tscal /data/misc/tscal/*

                chmod 775 /data/misc/tscal

                chmod 664 /data/misc/tscal/pointercal

Finally execute:

                adb shell am start -n org.zeroxlab.util.tscal/.TSCalibration

I have a device with eGalax touchscreen, and although it's properly calibrated, I can miscalibrate it using the calibration app, in particular I can flip axis. So hopefully this will allow you to get your touchscreen properly calibrated.

Note that the file /data/misc/tscal/pointercal is expected to be created at boot, but it only occurs on specific hardware (product or touchscreen). The logic is located in this file around line 308:

https://osdn.net/projects/android-x86/scm/git/device-generic-common/blobs/nougat-x86/init.sh

Michael.

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