tslib input not working

I wish to use tslib as input method for my display. When running the mousebuttons example, I can see the cursor moving, but I am not getting any pressdown events.

That worked fine in qt5.

Snippet from my configuration log from qtbase:

Features used by QPA backends:
  evdev .................................. yes
  libinput ............................... no
  HiRes wheel support in libinput ........ no
  INTEGRITY HID .......................... no
  mtdev .................................. no
  tslib .................................. yes
  xkbcommon .............................. yes
  X11 specific:
    XLib ................................. no
    XCB Xlib ............................. no
    EGL on X11 ........................... no
    xkbcommon-x11 ........................ no
    xcb-sm ............................... no

I.e. I got tslib and evdev configured and libinput disabled.

For testing, I am using the mousebuttons example:

https://code.qt.io/cgit/qt/qtbase.git/tree/examples/widgets/widgets/mousebuttons?h=6.4.2

Environment variables set upon starting:

export QT_QPA_EGLFS_TSLIB=1
export TSLIB_TSDEVICE="/dev/input/touchscreen0"

export QT_LOGGING_RULES="*=true"

During start of the application:

qt.qpa.input: Initializing tslib plugin "TsLib" ""
qt.qpa.input: tslib device is /dev/input/touchscreen0

So tslib is indeed being used.

Upon pressing the screen, the following is shown (due to debug being enabled):

qt.qpa.input.devices: no mouse-like devices registered for seat "" The platform plugin should have provided one via QWindowSystemInterface::registerInputDevice(). Creating a default mouse for now.
qt.pointer.velocity: velocity QVector2D(-176000, -176000) filtered QVector2D(-123200, -123200) based on movement QPointF(176,176) -> QPointF(0,0) over time 4221 -> 4222
qt.widgets.painting: Syncing QRegion(-7,-2 208x208) of QWidget(0x7edd5ad4)
qt.widgets.painting: Flushing QRegion(-7,-2 208x208) of QWidget(0x7edd5ad4)
qt.pointer.velocity: velocity QVector2D(2983.05, 2983.05) filtered QVector2D(2088.14, 2088.14) based on movement QPointF(0,0) -> QPointF(176,176) over time 4222 -> 4281
qt.widgets.gestures: QGestureManager:Recognizer: ignored the event:  QPanGesture(state=NoGesture,lastOffset=0,0QPointF(0,0),offset=0,0,acceleration=0,delta=0,0) QMouseEvent(MouseMove pos=163,163 scn=176,176 gbl=176,176 dev=QPointingDevice("core pointer" Mouse id=1))
qt.widgets.painting: Syncing QRegion(-12,-12 208x208) of QWidget(0x7edd5ad4)
qt.widgets.painting: Flushing QRegion(-12,-12 208x208) of QWidget(0x7edd5ad4)
qt.text.hittest: checking frame 0 point= QPointF(165,165) position QPointF(0,0) size QSizeF(774, 56)
qt.text.hittest:     checking block 0 point= QPointF(165,165)     tlrect QRectF(4,4 766x24)
qt.text.hittest:     after pos= 56
qt.text.hittest:     checking block 56 point= QPointF(165,165)     tlrect QRectF(4,28 766x24)
qt.text.hittest:     after pos= 102
qt.text.hittest: inside= 1  pos= 102

tslib works fine outside qt. Adding prints inside readMousedata in qtslib.cpp (https://code.qt.io/cgit/qt/qtbase.git/tree/src/platformsupport/input/tslib/qtslib.cpp?h=6.4.2) also shows correct functionality, i.e. detects proper x and y coordinates and pressdown events.

Made another test, where I used a simple qml test file:

import QtQuick 2.12
import QtQuick.Window 2.12

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    Rectangle {
        color: "red"
        x: 100
        y: 100
        width: 200
        height: 200
        MouseArea {
            anchors.fill: parent
            onPressed: {
                console.log("pressed")
            }
        }
    }
}

When starting that using qmlscene and pressing the screen afterwards gives an error:

"qt.quick.mouse: mouse grabber ambiguous: no event is currently being delivered"

Attempted to read through the log since qt5, and seems like quite a lot have happened. To be, it looks like a missing handler.

Worked in qt5. Tested with qt6.2.4 and qt 6.4.2 and none of those works.