Rotate Display and Touchscreen by 90 degrees

Technical Support
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1

I want to rotate the Resistive Touch Display 7" parallel counter clockwise so that it is portrait mode. I have a build running and have used xrandr to rotate the image using “xrandr -o left”. When doing this I lose the toradex logo and the background of the display turns black. This will likely not work for me. I also notice when the image is rotated the touchscreen is not rotated.

I also attempt to recalibrate the touchscreen using xinpu_calibrator. After the recalibration I do not see touches where they should be at all (mouse arrow doesn’t appear anywhere and when I actually move the mouse it starts from down below the bottom of the portrait display.

How can I permanently rotate the display and get the touchscreen calibrated appropriately? I ultimately want to enable this configuration without an Xsession running a Qt application on linux console.

2

Anyone have any input on my issue??

3

Which Qt application are you planning to use? With Qt5 and Qml one can rotate in the Qml root window using:

    transform: Rotation {
        angle: -90
        origin.x: Screen.height / 2
        origin.y: Screen.height / 2
    }

See also this thread which has a demo application.

Rather than solve the issue on several different Software stacks (X/Qt) I recommend to decide on a stack and tackle the problem there.

4

How will the touchscreen behave using this transform? Sorry I don’t have a working test environment at the moment to check it out.

5

According to the Qt Documentation it should transform mouse and touch input as well.