Why the application cannot get touch events on arm desktop linux

Rong.Lee

Hi all, my application on arm linux can't get touch events, it always gets mouse events when the screen is touched, but I can get touch event data by 'sudo od /dev/input/event16' and can get touch events by running "sudo ./app -platform eglfs" in terminal, the application works fine on x86 linux. What should I do to make the app get touch events on arm linux.

Rong.Lee

The libraries installed:
sudo apt install llvm-dev
sudo apt install bison build-essential clang flex gperf
libxcb-xinput-dev libinput-dev
libatspi2.0-dev libevdev-dev libudev-dev libclang-dev libcups2-dev
libdrm-dev libegl1-mesa-dev libfontconfig1-dev libfreetype6-dev
libgstreamer1.0-dev libhunspell-dev libnss3-dev libopengl-dev
libpulse-dev libssl-dev libts-dev libx11-dev libx11-xcb-dev
libxcb-glx0-dev libxcb-icccm4-dev libxcb-image0-dev libmtdev-dev
libxcb-keysyms1-dev libxcb-randr0-dev libxcb-render-util0-dev
libxcb-shape0-dev libxcb-shm0-dev libxcb-sync-dev libxcb-util-dev
libxcb-xfixes0-dev libxcb-xinerama0-dev libxcb-xkb-dev libxcb1-dev
libxcomposite-dev libxcursor-dev libxdamage-dev libxext-dev
libxfixes-dev libxi-dev libxkbcommon-dev libxkbcommon-x11-dev
libxkbfile-dev libxrandr-dev libxrender-dev libxshmfence-dev libvulkan-dev
libxshmfence1 llvm ninja-build nodejs python-is-python2 python2

The command configure:
./configure -prefix /usr/local/Qt-6.2.2 -shared -release -opensource -confirm-license -feature-vulkan -nomake examples -nomake tests -skip qtwebengine

The Qt version I have tried:
Qt-5.15.2, Qt-6.2.2 and Qt-6.3.1

The configuration output:

Info: creating super cache file /home/nayun/qt-everywhere-src-5.15.2/.qmake.super
Info: creating cache file /home/nayun/qt-everywhere-src-5.15.2/.qmake.cache
Info: creating stash file /home/nayun/qt-everywhere-src-5.15.2/.qmake.stash

This is the Qt Open Source Edition.

You have already accepted the terms of the Open Source license.

Running configuration tests...
Checking for machine tuple... yes
Checking for valid makespec... yes
Checking for target architecture... arm64
Checking for alloca() in alloca.h... yes
Checking for C++14 support... yes
Checking for C++17 support... yes
Checking for C99 support... yes
Checking for C11 support... yes
Checking for pkg-config... yes
Checking for D-Bus >= 1.2... yes
Checking for dlopen()... yes
Checking for new dtags support... yes
Checking for D-Bus >= 1.2 (host)... yes
Checking for Support for Intel Control-flow Enforcement Technology... no
Checking for udev... yes
Checking for POSIX fallocate()... yes
Checking for precompiled header support... yes
Checking for RDRAND instruction... no
Checking for RDSEED instruction... no
Checking for symbol visibility support... yes
Checking for -Bsymbolic-functions support... no
Checking for Signaling NaN for doubles... yes
Checking for STL compatibility... yes
Checking for zlib... yes
Checking for Zstandard... no
Checking for clock_gettime()... yes
Checking for POSIX monotonic clock... yes
Checking for C++11 <future>... yes
Checking for eventfd... yes
Checking for futimens()... yes
Checking for getauxval()... yes
Checking for getentropy()... yes
Checking for GLib... yes
Checking for GNU libc... yes
Checking for POSIX iconv... yes
Checking for ICU... yes
Checking for inotify... yes
Checking for SysV IPC... yes
Checking for linkat()... yes
Checking for ppoll()... yes
Checking for PCRE2... yes
Checking for renameat2()... yes
Checking for slog2... no
Checking for statx() in libc... yes
Checking for 64 bit atomics... yes
Checking for DoubleConversion... no
Checking for O_CLOEXEC... yes
Checking for C++11 <random>... yes
Checking for working std::atomic for function pointers... yes
Checking for OpenSSL Headers... yes
Checking for DTLS support in OpenSSL... yes
Checking for getifaddrs()... yes
Checking for KRB5 GSSAPI Support... no
Checking for IPv6 ifname... yes
Checking for Linux AF_NETLINK sockets... yes
Checking for OCSP stapling support in OpenSSL... yes
Checking for XCB >= 1.11... yes
Checking for XCB ICCCM >= 0.3.9... yes
Checking for XCB Util >= 0.3.9... yes
Checking for XCB SHM... yes
Checking for XCB Image >= 0.3.9... yes
Checking for XCB Keysyms >= 0.3.9... yes
Checking for XCB RandR... yes
Checking for XCB XRender... yes
Checking for XCB Renderutil >= 0.3.9... yes
Checking for XCB Shape... yes
Checking for XCB Sync... yes
Checking for XCB Xfixes... yes
Checking for XCB Xinerama... yes
Checking for XCB XKB... yes
Checking for XCB (extensions)... yes
Checking for xkbcommon >= 0.5.0... yes
Checking for xkbcommon-x11... yes
Checking for atspi... yes
Checking for Desktop OpenGL... yes
Checking for KMS... yes
Checking for DRM Atomic API... yes
Checking for EGL... yes
Checking for XLib... yes
Checking for EGL on X11... yes
Checking for EGLDevice... yes
Checking for GBM... no
Checking for Mali EGL... no
Checking for Mali 2 EGL... no
Checking for i.Mx6 EGL... no
Checking for XCB Xlib... yes
Checking for evdev... yes
Checking for FreeType... yes
Checking for Fontconfig... yes
Checking for libinput... yes
Checking for axis API in libinput... yes
Checking for LinuxFB... yes
Checking for mtdev... yes
Checking for OpenVG... no
Checking for default QPA platform... xcb
Checking for HarfBuzz... no
Checking for libjpeg... yes
Checking for libpng... yes
Checking for libmd4c... no
Checking for XCB XInput... yes
Checking for tslib... yes
Checking for Vulkan... yes
Checking for X11 prefix... /usr
Checking for XCB GLX... yes
Checking for X11 session management... no
Checking for GTK+ >= 3.6... no
Checking for CUPS... yes
Checking for DB2 (IBM)... no
Checking for InterBase... no
Checking for MySQL... no
Checking for OCI (Oracle)... no
Checking for ODBC... no
Checking for PostgreSQL... no
Checking for SQLite (version 2)... no
Checking for TDS (Sybase)... no
Checking for ntddmodm... no
Checking for Socket CAN... yes
Checking for Socket CAN FD... yes
Checking for 64bit pointers... yes
Checking for Sufficiently recent FPU on ARM... yes
Checking for python... /usr/bin/python
Checking for Direct3D 12... no
Checking for Assimp... no
Checking for SDL2... no
Checking for Assimp... no
Checking for Autodesk FBX... no
Checking for Wayland client library... no
Checking for Wayland EGL library... no
Checking for wayland-server... no
Checking for BlueZ... no
Checking for sensorfw... no
Checking for Gypsy... no
Checking for WinRT Geolocation API... no
Checking for ALSA... no
Checking for GStreamer 1.0... no
Checking for GStreamer 0.10... no
Checking for Video for Linux... yes
Checking for OpenAL... no
Checking for PulseAudio >= 0.9.10... yes
Checking for libresourceqt5... no
Checking for Flite... no
Checking for Speech Dispatcher... no
Checking for libclang... yes
Done running configuration tests.

Configure summary:

Build type: linux-clang (arm64, CPU features: neon)
Compiler: clang 10.0.0
Configuration: compile_examples enable_new_dtags largefile neon precompile_header shared shared rpath release c++11 c++14 c++17 c++1z concurrent dbus reduce_exports stl
Build options:
Mode ................................... release
Optimize release build for size ........ no
Building shared libraries .............. yes
Using C standard ....................... C11
Using C++ standard ..................... C++17
Using ccache ........................... no
Using new DTAGS ........................ yes
Relocatable ............................ yes
Using precompiled headers .............. yes
Using LTCG ............................. no
Target compiler supports:
NEON ................................. yes
Build parts ............................ libs tools
Qt modules and options:
Qt Concurrent .......................... yes
Qt D-Bus ............................... yes
Qt D-Bus directly linked to libdbus .... yes
Qt Gui ................................. yes
Qt Network ............................. yes
Qt Sql ................................. yes
Qt Testlib ............................. yes
Qt Widgets ............................. yes
Qt Xml ................................. yes
Support enabled for:
Using pkg-config ....................... yes
udev ................................... yes
Using system zlib ...................... yes
Zstandard support ...................... no
Qt Core:
DoubleConversion ....................... yes
Using system DoubleConversion ........ no
GLib ................................... yes
iconv .................................. no
ICU .................................... yes
Built-in copy of the MIME database ..... yes
Tracing backend ........................ <none>
Logging backends:
journald ............................. no
syslog ............................... no
slog2 ................................ no
PCRE2 .................................. yes
Using system PCRE2 ................... yes
Qt Network:
getifaddrs() ........................... yes
IPv6 ifname ............................ yes
libproxy ............................... no
Linux AF_NETLINK ....................... yes
OpenSSL ................................ yes
Qt directly linked to OpenSSL ........ no
OpenSSL 1.1 ............................ yes
DTLS ................................... yes
OCSP-stapling .......................... yes
SCTP ................................... no
Use system proxies ..................... yes
GSSAPI ................................. no
Qt Gui:
Accessibility .......................... yes
FreeType ............................... yes
Using system FreeType ................ yes
HarfBuzz ............................... yes
Using system HarfBuzz ................ no
Fontconfig ............................. yes
Image formats:
GIF .................................. yes
ICO .................................. yes
JPEG ................................. yes
Using system libjpeg ............... yes
PNG .................................. yes
Using system libpng ................ yes
Text formats:
HtmlParser ........................... yes
CssParser ............................ yes
OdfWriter ............................ yes
MarkdownReader ....................... yes
Using system libmd4c ............... no
MarkdownWriter ....................... yes
EGL .................................... yes
OpenVG ................................. no
OpenGL:
Desktop OpenGL ....................... yes
OpenGL ES 2.0 ........................ no
OpenGL ES 3.0 ........................ no
OpenGL ES 3.1 ........................ no
OpenGL ES 3.2 ........................ no
Vulkan ................................. yes
Session Management ..................... yes
Features used by QPA backends:
evdev .................................. yes
libinput ............................... yes
INTEGRITY HID .......................... no
mtdev .................................. yes
tslib .................................. yes
xkbcommon .............................. yes
X11 specific:
XLib ................................. yes
XCB Xlib ............................. yes
EGL on X11 ........................... yes
xkbcommon-x11 ........................ yes
QPA backends:
DirectFB ............................... no
EGLFS .................................. yes
EGLFS details:
EGLFS OpenWFD ........................ no
EGLFS i.Mx6 .......................... no
EGLFS i.Mx6 Wayland .................. no
EGLFS RCAR ........................... no
EGLFS EGLDevice ...................... yes
EGLFS GBM ............................ no
EGLFS VSP2 ........................... no
EGLFS Mali ........................... no
EGLFS Raspberry Pi ................... no
EGLFS X11 ............................ yes
LinuxFB ................................ yes
VNC .................................... yes
XCB:
Using system-provided xcb-xinput ..... yes
Native painting (experimental) ....... no
GL integrations:
GLX Plugin ......................... yes
XCB GLX .......................... yes
EGL-X11 Plugin ..................... yes
Qt Sql:
SQL item models ........................ yes
Qt Widgets:
GTK+ ................................... no
Styles ................................. Fusion Windows
Qt PrintSupport:
CUPS ................................... yes
Qt Sql Drivers:
DB2 (IBM) .............................. no
InterBase .............................. no
MySql .................................. no
OCI (Oracle) ........................... no
ODBC ................................... no
PostgreSQL ............................. no
SQLite2 ................................ no
SQLite ................................. yes
Using system provided SQLite ......... no
TDS (Sybase) ........................... no
Qt Testlib:
Tester for item models ................. yes
Serial Port:
ntddmodm ............................... no
Qt SerialBus:
Socket CAN ............................. yes
Socket CAN FD .......................... yes
SerialPort Support ..................... yes
Further Image Formats:
JasPer ................................. no
MNG .................................... no
TIFF ................................... yes
Using system libtiff ................. yes
WEBP ................................... yes
Using system libwebp ................. no
Qt QML:
QML network support .................... yes
QML debugging and profiling support .... yes
QML just-in-time compiler .............. yes
QML sequence object .................... yes
QML XML http request ................... yes
QML Locale ............................. yes
Qt QML Models:
QML list model ......................... yes
QML delegate model ..................... yes
Qt Quick:
Direct3D 12 ............................ no
AnimatedImage item ..................... yes
Canvas item ............................ yes
Support for Qt Quick Designer .......... yes
Flipable item .......................... yes
GridView item .......................... yes
ListView item .......................... yes
TableView item ......................... yes
Path support ........................... yes
PathView item .......................... yes
Positioner items ....................... yes
Repeater item .......................... yes
ShaderEffect item ...................... yes
Sprite item ............................ yes
QtQuick3D:
Assimp ................................. yes
System Assimp .......................... no
Qt Scxml:
ECMAScript data model for QtScxml ...... yes
Qt Gamepad:
SDL2 ................................... no
Qt 3D:
Assimp ................................. yes
System Assimp .......................... no
Output Qt3D GL traces .................. no
Use SSE2 instructions .................. no
Use AVX2 instructions .................. no
Aspects:
Render aspect ........................ yes
Input aspect ......................... yes
Logic aspect ......................... yes
Animation aspect ..................... yes
Extras aspect ........................ yes
Qt 3D Renderers:
OpenGL Renderer ........................ yes
RHI Renderer ........................... no
Qt 3D GeometryLoaders:
Autodesk FBX ........................... no
Qt Wayland Client ........................ no
Qt Wayland Compositor .................... no
Qt Bluetooth:
BlueZ .................................. no
BlueZ Low Energy ....................... no
Linux Crypto API ....................... no
Native Win32 Bluetooth ................. no
WinRT Bluetooth API (desktop & UWP) .... no
WinRT advanced bluetooth low energy API (desktop & UWP) . no
Qt Sensors:
sensorfw ............................... no
Qt Quick Controls 2:
Styles ................................. Default Fusion Imagine Material Universal
Qt Quick Templates 2:
Hover support .......................... yes
Multi-touch support .................... yes
Qt Positioning:
Gypsy GPS Daemon ....................... no
WinRT Geolocation API .................. no
Qt Location:
Qt.labs.location experimental QML plugin . yes
Geoservice plugins:
OpenStreetMap ........................ yes
HERE ................................. yes
Esri ................................. yes
Mapbox ............................... yes
MapboxGL ............................. yes
Itemsoverlay ......................... yes
QtXmlPatterns:
XML schema support ..................... yes
Qt Multimedia:
ALSA ................................... no
GStreamer 1.0 .......................... no
GStreamer 0.10 ......................... no
Video for Linux ........................ yes
OpenAL ................................. no
PulseAudio ............................. yes
Resource Policy (libresourceqt5) ....... no
Windows Audio Services ................. no
DirectShow ............................. no
Windows Media Foundation ............... no
Qt TextToSpeech:
Flite .................................. no
Flite with ALSA ........................ no
Speech Dispatcher ...................... no
Qt Tools:
Qt Assistant ........................... yes
Qt Designer ............................ yes
Qt Distance Field Generator ............ yes
kmap2qmap .............................. yes
Qt Linguist ............................ yes
Mac Deployment Tool .................... no
makeqpf ................................ yes
pixeltool .............................. yes
qdbus .................................. yes
qev .................................... yes
Qt Attributions Scanner ................ yes
qtdiag ................................. yes
qtpaths ................................ yes
qtplugininfo ........................... yes
Windows deployment tool ................ no
WinRT Runner Tool ...................... no
Qt Tools:
QDoc ................................... yes

Note: No wayland-egl support detected. Cross-toolkit compatibility disabled.

Qt is now configured for building. Just run 'make'.
Once everything is built, you must run 'make install'.
Qt will be installed into '/usr/local/Qt-5.15.2'.

Prior to reconfiguration, make sure you remove any leftovers from
the previous build.

JoeCFD

Can you try the following if any widget(for example table widget) is used?
m_tableWidget->setAttribute( Qt::WA_AcceptTouchEvents );

Rong.Lee

@JoeCFD WA_AcceptTouchEvents has been set, the application can receive touch enevts on Windows and x86 linux, only cannot receive touch enevts on arm linux.

Rong.Lee

@JoeCFD It also can receive touch events when running as "sudo ./app -platform eglfs", but it's not what I need, I only want it can receive touch events on arm xcb linux, not embedded linux mode.